PowerFlex 40 Fault Codes: Complete Troubleshooting Guide (F13, F12, F81 & More)

When an Allen-Bradley PowerFlex 40 VFD throws a fault code on your production line, every minute of downtime translates directly to lost revenue and frustrated operators. Whether you're seeing F081, F12, or any other fault flashing on the keypad display, understanding what went wrong—and how to fix it—is critical. This comprehensive guide decodes every PowerFlex 40 fault code, explains root causes, and shows you exactly when troubleshooting ends and component-level repair begins.

How PowerFlex 40 Fault Codes Work

The PowerFlex 40 (22B series) and PowerFlex 40P (22D series) display active faults as "F###" on the LCD keypad. When a fault trips the drive, it shuts down motor output and stores the fault in its history buffer. You can view the three most recent faults through parameters Fault 1, Fault 2, and Fault 3, along with their associated operating conditions at the time of trip. To clear an active fault, press the STOP button followed by RESET—or cycle control power if the keypad is unresponsive. Some faults auto-reset once the condition clears; others require manual intervention. Critical faults like F12 or F70 indicate internal hardware failure in the power section or control board. These won't clear without professional VFD repair, and repeatedly attempting to restart can cause catastrophic secondary damage to IGBTs, gate drivers, or the DC bus.

Power & DC Bus Faults

F3 — Power Loss

F3 is triggered by excessive ripple on the DC bus rather than by a complete loss of supply, which is why it often appears on a drive that seems to be running normally. Rockwell classifies it as a Type 2 fault. Ripple climbs when one of the three incoming phases is missing or weak, when the input line is badly imbalanced, or when the bus capacitors have aged and no longer smooth the rectified waveform.

The manual's action is to monitor the incoming line for phase loss or line imbalance and to check the input line fuse — a single blown fuse in a three-phase supply produces exactly this symptom while the drive continues to operate on the remaining phases. Measure all three phase-to-phase voltages at the drive terminals under load, not at the panel. If the supply is balanced and the fuses are intact, the bus capacitors are the next suspect, and on a drive more than eight to ten years old that is the most likely answer.

DIY or repair: the supply-side checks are DIY. Capacitor replacement is a repair job — the bus holds a lethal charge long after power is removed.

F4 — Undervoltage (Bus Undervoltage)

The F4 powerflex 40 fault indicates the DC bus voltage dropped below the acceptable threshold—typically below 200VDC on 240VAC input models or below 380VDC on 480VAC units. Common causes include incoming power sags or brownouts, loose AC input connections at L1/L2/L3 terminals, blown fuses in upstream disconnects, or failing DC bus capacitors that can no longer maintain charge during brief line disturbances. Check your facility's incoming voltage with a true RMS multimeter during operation, especially if the fault occurs during high-load periods when building voltage naturally sags. Inspect all power terminations for tightness and discoloration indicating resistive heating. Aging electrolytic bus capacitors lose capacitance over time and eventually cannot buffer voltage dips—you'll see this as increasingly frequent F4 trips that eventually become permanent. If the fault persists after verifying clean, stable incoming power and tight connections, the DC bus capacitors or rectifier section likely needs component-level repair.

F5 — Overvoltage (Bus Overvoltage)

F5 powerflex 40 overvoltage faults occur when the DC bus exceeds safe limits—usually above 410VDC for 240V models or 820VDC for 480V models. The most common cause is regenerative energy from decelerating high-inertia loads: when the motor acts as a generator during deceleration, it pumps energy back into the DC bus faster than the drive's braking resistor (if equipped) or bleed resistors can dissipate it. Increasing the deceleration ramp time (P015) often eliminates the fault by slowing the rate of regeneration. Excessively high incoming line voltage—especially on 480VAC systems where utility voltage may swing to 510VAC or higher—also triggers F5. Verify your incoming voltage remains within ±10% of nameplate. In rare cases, shorted or degraded DC bus capacitors can cause voltage regulation issues that manifest as overvoltage. An internal braking chopper failure (on models equipped) prevents regenerative energy dissipation. If F5 persists after extending decel time and confirming normal line voltage, internal DC bus components require inspection and professional repair.

F12 — HW Overcurrent

F12 is one of the most serious allen bradley powerflex 40 fault codes—it means the hardware overcurrent protection detected instantaneous current far exceeding safe levels, indicating an output short circuit, phase-to-ground fault, or catastrophic IGBT failure. This fault trips in microseconds, before software monitoring can react. Common causes include damaged motor cable with exposed conductors shorting phase-to-phase or phase-to-ground, motor winding insulation breakdown creating turn-to-turn shorts, or internal IGBT module failure where the semiconductor has shorted. Do not repeatedly reset and attempt to restart a drive displaying F12. Each restart attempt with a shorted output can destroy additional IGBTs, gate driver circuits, current sensors, and even the control board. Before applying power again, megger-test all three motor cable phases to ground and phase-to-phase with the motor disconnected—you should see infinite resistance. If the cable and motor test clean but F12 immediately recurs, the IGBT module or gate driver has failed internally and requires component-level IGBT replacement and gate driver repair.

F70 — Power Unit

The F70 fault indicates a general power section hardware failure that the drive's diagnostics detected but couldn't categorize more specifically. This typically points to gate driver circuit problems, IGBT desaturation detection, shoot-through protection triggering, or internal power supply issues feeding the gate drivers. The fault may appear intermittently during acceleration or under heavy load when gate driver demands are highest. Thermal cycling from normal operation can crack solder joints on gate driver boards, particularly on older units. The drive must be opened and the power section thoroughly inspected—checking gate resistor values, opto-isolator continuity, bootstrap capacitor condition, and IGBT gate threshold voltages. This is not a field-serviceable fault; it requires bench-level diagnostics with the drive energized under controlled conditions. If your PowerFlex 40 displays F70, the power section needs professional VFD repair with component-level troubleshooting.

Motor Protection Faults

F6 — Motor Stalled

F6 means the drive could not accelerate the motor within the configured limits — it commanded more speed, the current hit the ceiling set by A089 [Current Limit 1], and the shaft did not follow. It is a Type 1 fault, so it can be cleared automatically through the auto-restart parameters, though doing so without finding the cause simply repeats the stall.

Rockwell's action is to increase the accel time (P039…A067 [Accel Time x]) or reduce the load so drive output current does not exceed the current limit. In practice F6 splits into two very different situations. Either the ramp is too aggressive for the inertia — common after someone shortens accel time to speed up a cycle — or the load has genuinely become harder to turn: a seized bearing, a jammed conveyor, a blocked impeller, a brake that is not releasing. Turn the shaft by hand with the drive stopped and locked out. If it turns freely, the setting is the problem; if it does not, the machine is.

DIY or repair: DIY in almost all cases. F6 points at the mechanics or the parameters, not at the drive.

F7 — Motor Overload

F7 indicates the electronic motor overload protection tripped, meaning the drive calculated that accumulated I²t heating exceeded safe motor thermal limits. The PowerFlex 40 continuously monitors motor current and estimates winding temperature based on parameter P033 (Motor Overload Current). If motor current remains above P033 for an extended period, F7 trips to protect the motor from burnout. Common causes include mechanical binding or jamming of the driven load, undersized drive for the application (particularly if motor FLA is near or exceeds drive FLA rating), blocked motor cooling fan, or incorrect P033 setting. Verify P033 is set to motor nameplate FLA. Check the load for mechanical issues—a jammed conveyor, seized bearing, or foreign object obstruction dramatically increases current demand. Verify the motor cooling fan operates and airflow isn't blocked. If the application genuinely requires sustained current above motor rating, you need a larger motor and drive. The fault auto-resets once the thermal accumulator times out. If F7 persists on a free-running motor with correctly set parameters, excessive bearing friction or winding degradation may require drive testing and motor evaluation.

F8 — Heatsink Overtemperature

F8 trips when the heatsink temperature sensor detects thermal levels exceeding safe operating limits—typically 85-90°C depending on drive frame size. The most common cause is cooling fan failure: the PowerFlex 40 uses an internal fan (on most frame sizes) to pull air through the heatsink assembly, and when this fan fails, heatsink temps rapidly climb under load. Check if the fan spins when the drive is powered. Years of operation accumulate dust, lint, and particulate inside the drive that blocks airflow between heatsink fins—compressed air cleaning often resolves F8 on neglected units. Verify the drive mounting provides adequate clearance per installation manual specifications: side-by-side drives in cramped panels without spacing cause heat buildup. Excessive ambient temperature—operating above the drive's rated 40°C or 50°C ambient—causes legitimate overtemperature. In rare cases, the thermistor itself fails open-circuit and falsely reports overtemperature. If the fan spins, the heatsink is clean, ambient and clearances are adequate, but F8 continues, the thermal sensor or its interface circuit may need component-level repair.

F64 — Drive Overload

F64 reports that the drive itself has been pushed past its rating — 150% of rated current for one minute, or 200% for three seconds. This is the drive protecting its own power section, and it is distinct from F7, which protects the motor. A drive can trip F64 while the motor is still well within its thermal limits, typically because the drive was sized for the nameplate load and the real duty cycle turned out to be heavier.

Rockwell's action is to reduce the load or extend the accel time. If neither is possible, the drive is undersized for the application and the correct fix is a larger frame, not a parameter change. Repeated F64 trips are worth logging: a drive that rides near its overload threshold runs hot, and heat is what kills the bus capacitors and the IGBT solder joints over the following years.

DIY or repair: DIY — this is a sizing and duty-cycle question. It becomes a repair issue only when F64 appears at loads the drive used to handle, which suggests the current sensing or the cooling has degraded.

F71 — Net Loss

F71 indicates network communication loss when the PowerFlex 40 is configured for network control via an optional communication card (DSI network adapter, EtherNet/IP adapter, or DeviceNet). The drive was receiving run commands and reference speed over the network but lost connection, and parameter P093 (Net Loss Action) is configured to fault rather than coast or continue. Verify the communication cable is securely seated in the adapter and hasn't been damaged or pinched. Check network termination resistors if you're at the end of a trunk—RS485-based networks like DSI require 120-ohm terminators at both physical ends. Inspect the LED indicators on the communication card itself: most show network status, and you can diagnose cable issues versus card failure by LED pattern. Verify the PLC or network master is actively communicating and hasn't faulted. If all network cabling, terminations, and master devices check out but F71 persists, the communication adapter card itself may have failed—particularly the isolation transformer or transceiver IC. If the communication adapter needs replacement but is discontinued or on backorder, the card can often be repaired at the component level.

Input/Phase Faults

F13 — Ground Fault

F13 means the drive detected a current path to earth ground at one or more of its output terminals. On the PowerFlex 40 the display shows F13; you will also see it written as F013 in search results and service notes, because the PowerFlex 525 uses the three-digit form for the same kind of fault. Both refer to current escaping to ground rather than returning through the motor windings. Rockwell classifies F13 as a Type 2 fault, which means it will not clear through the auto-restart function — the condition has to be found and corrected first.

The usual causes are a motor cable with damaged insulation touching the conduit or tray, moisture or coolant that has tracked into a junction box, or motor winding insulation that has broken down to the frame. On drives that have been in service a long time, the winding failure is more common than the cable. Rockwell's instruction is to check the motor and the external wiring to the drive output terminals for a grounded condition — in practice that means disconnecting the motor leads at the drive and megger-testing each phase to ground. If the motor and cable both test clean and F13 still appears with the output disconnected, the fault is inside the drive: the ground-fault detection circuit or the output stage.

DIY or repair: the diagnosis is DIY if you have a megger. The fix is a repair job when the drive itself is at fault, and a motor or cable job when it is not. Do not bypass F13 or raise trip thresholds to keep a line running — a ground fault is a shock and fire hazard, not a nuisance trip.

Looking for the same fault on a different drive? Our PowerFlex 525 fault codes guide covers F013 on the 525 series.

F41, F42, F43 — Phase-to-Phase Shorts

These three codes report excessive current between two output terminals: F41 between phases U and V, F42 between U and W, and F43 between V and W. All three are Type 2 faults. Unlike F13, which is current leaving to ground, these are current crossing directly between two motor phases, so the fault is either in the motor cable, in the motor windings, or in the drive's output transistors.

Rockwell's action is to check the motor and drive output terminal wiring for a shorted condition, and to replace the drive if the fault cannot be cleared. Test in that order: disconnect the motor leads at the drive and measure phase-to-phase resistance at the motor — the three readings should be nearly identical. A low or badly unbalanced reading points at the motor. If the motor checks out and the code returns with nothing connected to the output, the IGBT module has shorted and the drive needs bench repair.

DIY or repair: repair. A shorted output stage does not recover, and repeatedly resetting a drive that reports F41, F42 or F43 destroys more of the power section each time.

F81 / F081 — Comm Loss (Or Input Phase Loss on some firmware)

The f081 fault powerflex 40 code causes significant confusion because its meaning changed across firmware revisions. On most PowerFlex 40 units with communication cards installed, F081 (displayed as F81 on some keypads) indicates communication loss with the installed option card—essentially identical to F71 but representing a different layer of the communication stack or timeout condition. If you're running a DSI network adapter, EtherNet/IP card, or other communication option and see F081, troubleshoot it as a network fault: check cable continuity, network termination, proper card seating, and master controller communication. The comm card's LED diagnostics usually pinpoint whether you have a wiring issue or card-level failure. However, on some older firmware versions and configurations without communication cards, F081 indicates input phase loss—meaning the drive detected missing or severely imbalanced voltage on one of the three input phases L1, L2, or L3. This can be caused by a blown fuse in the upstream disconnect, loose or corroded input terminal, failed contactor contact, or utility phase loss. Use a multimeter to verify all three phase-to-phase voltages (L1-L2, L2-L3, L3-L1) are present and balanced within 2%. On 480VAC systems, you should see approximately 480V on all three measurements. For powerflex 22b fault codes specifically, consult your drive's firmware revision documentation to confirm which interpretation applies—or simply observe whether you have a communication card installed. If F081 appears on a drive with no communication options, it's definitely input phase loss. If cabling and incoming power are verified good but F081 recurs, the input rectifier section or phase-loss detection circuit may require component-level repair.

F33 — Auto Restart Tries Exceeded

F33 appears when the auto-restart function (configured via parameter P304) attempted to restart the drive after a fault but exceeded the maximum number of retry attempts without successful operation. This is a secondary fault—the drive experienced an underlying fault condition (such as F7, F8, or F4), attempted to auto-restart per P304 settings, but the original fault immediately recurred each time. F33 tells you the drive gave up trying. To resolve it, you must identify and fix the root-cause fault. Check the fault history (Fault 1, Fault 2, Fault 3 parameters) to see what fault triggered before F33 appeared. Address that underlying condition—whether it's a jammed motor, cooling issue, or power supply problem—before resetting. Auto-restart is valuable for nuisance trips from brief power glitches, but persistent faults indicate real problems that auto-restart cannot overcome. If the underlying fault requires drive repair, the auto-restart feature will simply attempt to operate failed hardware, potentially causing additional damage.

F38, F39, F40 — Phase U/V/W to Ground

These three faults indicate the drive detected a short circuit from one of the output phases directly to ground: F38 is phase U (T1), F39 is phase V (T2), and F40 is phase W (T3). The drive's ground-fault detection circuit monitors for imbalanced current that indicates leakage to ground rather than returning through the motor neutral. The most common cause is motor cable insulation damage—a cable crushed in a cable tray pinch point, cut by sharp sheet metal edges, or deteriorated from heat, oil, or chemical exposure. Motor winding insulation failure, particularly on older motors or those exposed to moisture ingress, creates phase-to-frame shorts. Internal IGBT failure can also cause these faults if the semiconductor shorts and creates a path to the grounded heatsink. Disconnect the motor cable at both ends and use a 500V or 1000V megohmmeter to test each phase conductor to ground individually—you should read >100 megohms on good cable and windings. Test phase-to-phase as well. If the cable and motor test clean but F38/F39/F40 immediately recur when reconnected, the IGBT module has likely shorted internally and needs IGBT module replacement and power section repair.

Hardware & Internal Faults

F2 — Auxiliary Input

F2 means an auxiliary input interlock is open. It is a Type 1 fault and, importantly, it is often not a fault at all — it is the drive correctly reporting that an external safety or permissive circuit has opened. An E-stop, a door switch, a vibration cutout or a supervisory PLC contact will all produce F2 when they do their job.

Rockwell's action is to check the remote wiring and to verify communications programming for an intentional fault. Start by identifying which interlock is in the chain and whether it is genuinely open; a loose ferrule or a corroded contact in a long interlock loop produces intermittent F2 trips that look random. Only after the external circuit is proven should you suspect the digital input on the drive.

DIY or repair: DIY. F2 points outward at the wiring, not inward at the drive.

F29 — Analog Input Loss

F29 appears when an analog input configured to fault on signal loss has lost its signal. The behaviour is set by A122 [Analog In Loss], so a drive that has never shown F29 may start showing it after someone enables that protection. It is a Type 1 fault.

The manual's action is to check the parameters and to look for broken or loose connections at the inputs. On a 4–20 mA speed reference the usual cause is exactly what the protection is designed to catch: a broken wire, a failed transmitter, or a loop power supply that has dropped out. Measure the loop current at the drive terminals — below roughly 4 mA the drive is right and the loop is broken. Shielded signal cable routed alongside motor leads is a frequent source of intermittent F29 on installations that were fine for years.

DIY or repair: DIY. This is an instrumentation and wiring fault.

F48 — Params Defaulted

F48 means the drive was commanded to write default values to EEPROM. It is not a hardware failure — it is the drive telling you that its configuration has been reset and the application parameters are gone. It appears after a deliberate reset to defaults, and sometimes after a firmware operation.

Rockwell's action is to clear the fault or cycle power, then program the drive parameters as needed. The practical lesson is about preparation rather than repair: a drive whose parameters were never recorded turns a five-minute reset into hours of re-commissioning. Keep a copy of the parameter set for every drive in the plant, either on a HIM module or as a printed list in the panel.

DIY or repair: DIY, provided you have the parameter list. If F48 keeps returning on its own without anyone commanding a reset, the EEPROM or the control board is failing and the drive needs attention.

F63 — Software Overcurrent

F63 represents an overcurrent condition detected by the drive's software monitoring algorithms rather than the instantaneous hardware protection that triggers F12. The drive continuously samples motor current through its current sensors and compares it to safe operating envelopes. F63 trips when current exceeds limits but not with the immediate severity that triggers hardware shutdown. This can occur during accelerations with aggressive ramp times on high-inertia loads, momentary load impacts or jamming, or gradual current increases from deteriorating mechanical components. The root causes overlap significantly with F12—output shorts, ground faults, motor issues—but F63 represents a "slower" overcurrent that software caught before hardware limits were reached. Investigate the same potential issues: check motor cable integrity, verify motor windings aren't shorted, inspect the load for mechanical binding. If the application legitimately requires high inrush during acceleration, extend the acceleration ramp time (P014). If F63 occurs during steady-state operation at constant speed rather than during transitions, that suggests load issues or developing motor problems. When F63 persists despite clean motor cables and free-running loads, internal current sensing circuits or power section components may need professional diagnosis and repair.

F80 — SVC Autotune

F80 means the autotune routine was either cancelled by the user or failed to complete. Sensorless vector control needs a reasonably accurate picture of the motor's stator resistance and flux characteristics, and autotune is how the drive measures them. When the routine cannot converge, the drive raises F80 and falls back to whatever values it already held.

The manual's action is simply to restart the procedure. Before repeating it, confirm the motor nameplate data entered into the drive is correct, that the motor is connected and free to turn if you are running a rotating tune, and that nothing is driving the shaft externally. An autotune attempted on a motor still coupled to a load that resists rotation will fail every time.

DIY or repair: DIY. F80 is a commissioning step, not a fault in the drive.

F100 — Parameter Checksum

F100 indicates the drive detected corruption in its non-volatile parameter memory—the checksum calculated from stored parameters doesn't match the expected value, meaning data has been corrupted. This typically results from power loss or voltage sag during the moment the drive was writing parameters to EEPROM, causing incomplete or garbled data storage. Electrical noise, loose control power connections, or marginal power supplies can cause brownout conditions that corrupt memory writes. Less commonly, the EEPROM itself has reached end-of-life after excessive write cycles or has developed a hardware fault. To recover, load default parameters (consult your manual for the specific procedure, typically involving parameter P118 or a reset sequence), then re-enter your application parameters. If F100 was a one-time occurrence after a known power event, this resolves it. If F100 recurs regularly—especially after parameter changes or power cycles—the EEPROM or its supporting circuitry on the control board is failing. Some drives exhibit F100 in conjunction with other erratic behavior like random faults or display glitches, pointing to broader control board issues. When F100 persists after reloading defaults, the control board requires component-level repair including EEPROM replacement.

F122 — I/O Board Fail

F122 indicates hardware failure on the I/O daughter board or its communication link to the main control board. The PowerFlex 40's analog inputs, digital inputs, relay outputs, and analog output are located on a small I/O board that communicates status to the main processor. F122 means this communication failed or the I/O board's self-diagnostics detected a fault condition. Check that the I/O board is properly seated in its connector—vibration can work boards loose over time. Verify no obvious physical damage, burn marks, or component damage on the visible I/O board (usually accessible after removing the keypad/cover). In most cases, F122 indicates component-level failure on the I/O board itself—failed op-amps in the analog input conditioning circuits, damaged opto-isolators on digital inputs, or burned relay driver transistors. The drive cannot auto-recover from F122; it requires I/O board repair or replacement.

PowerFlex 40 Fault Code Quick Reference Table

When to Repair vs Replace Your PowerFlex 40

The decision to repair or replace a faulted PowerFlex 40 comes down to economics and timeline. New Allen-Bradley PowerFlex 40 drives range from approximately $400 for small fractional-horsepower frames to $1,500+ for larger 480VAC models—assuming you can even get them. Many PowerFlex 40 frame sizes have been discontinued as Allen-Bradley transitions to newer product lines, and remaining stock faces 6 to 16-week lead times or longer in the current supply chain environment. Procurement delays and the hassle of reapproving capital expenditures make new purchases problematic when a production line is down. Component-level repair of PowerFlex 40 drives typically costs $250 to $650 depending on the failure—IGBT module replacement, DC bus capacitor rebuild, control board repair, or gate driver circuits—with 5 to 10 business day standard turnaround and rush service available in 48 to 72 hours for critical applications. Repair makes clear financial sense for drives under 10HP, discontinued frames, and situations where downtime costs exceed the price differential. Replacement might make more sense if you're upgrading to networked communication architecture and the old drive lacks the necessary option card slots, or if the drive has suffered catastrophic damage (lightning strike, flood, fire) where multiple assemblies are destroyed. For straightforward component failures—F12 IGBT faults, F100 control board issues, F8 fan replacement, or DC bus capacitor aging—repair delivers the drive back in your hands faster and cheaper than new procurement. With a 2-year warranty on all repairs, the risk is minimal.

How Flexa Systems Repairs PowerFlex 40 Drives

Flexa Systems performs component-level repair on both PowerFlex 40 (22B series) and PowerFlex 40P (22D series) drives at our facility in Lewisville, Texas. Our process begins with comprehensive diagnostics within 24 to 48 hours of receiving your drive. We fully disassemble the unit and test the IGBT module using curve tracer analysis to identify shorted or open junctions. Gate driver boards are tested under simulated load conditions to verify proper switching signals and timing. DC bus capacitors are measured for ESR and capacitance to identify degraded cells that cause F4/F5 faults. Control boards undergo functional testing with all I/O exercised, communication ports verified, and parameter memory tested. Current sensors, voltage sensing circuits, thermistors, fans, and power supplies are all checked against specifications. Once diagnostics pinpoint the failure, we provide a detailed quote with no-fix no-charge policy—you only pay if we successfully repair your drive. After approval, failed components are replaced with OEM-equivalent or superior parts: IGBT modules, gate driver ICs, electrolytic capacitors, optocouplers, voltage regulators, and more. Following repair, every drive undergoes full load testing on our dynamometer testbench where we verify current draw, voltage output, switching behavior, and thermal performance under actual load across the entire operating range. We test all programmed parameters and communication functions. Only after passing comprehensive load testing do we return the drive with a 2-year warranty covering parts and labor. Standard turnaround is 5 to 30 business days; rush service delivers critical repairs in 48 to 72 hours. We provide free diagnostic evaluation, so you know exactly what failed and what it costs to fix before committing.

Get a Free PowerFlex 40 Repair Quote

If you're facing powerflex 40 troubleshooting challenges and fault codes that won't clear, don't waste weeks waiting for new drive procurement or risk further damage by repeatedly resetting hardware faults. Flexa Systems offers free diagnostic evaluation with no-fix no-charge guarantee—you risk nothing by sending your drive in for professional assessment. Our component-level repair typically costs 30% to 50% of new drive pricing and gets you back in production in days rather than months. We repair all frame sizes of the PowerFlex 40 (22B) and PowerFlex 40P (22D) series, from fractional horsepower through 20HP models, on both 240VAC and 480VAC input. Whether you're fighting F081 communication faults, F12 overcurrent damage, F100 control board corruption, or chronic F4/F5 bus voltage issues, we diagnose the root cause and provide detailed repair options. Call us at (254) 254-0005 to discuss your specific fault codes and get a ballpark repair estimate. Or visit our online quote request page to provide drive details and fault information—we'll respond within hours during business days. For detailed information about our PowerFlex 40 repair capabilities, visit our PowerFlex 40 repair service page. Rush service available for critical production equipment. Two-year warranty on all repairs. Free diagnostics. We are not affiliated with the OEM, but we stand behind our component-level repair work with the expertise and warranty that keeps your Allen-Bradley PowerFlex 40 drives running for years to come.