The Invertek Optidrive E3 (ODE-3) is a compact general-purpose variable frequency drive. It covers 0.37 kW to 37 kW (0.5 HP to 50 HP) on 110 V to 480 V supplies, with single- and three-phase input. When an E3 trips, its 6-digit 7-segment display shows a short code such as O-I, h O-I or U-Volt. Some of these codes point to the motor, wiring or supply. Others point inside the drive. This guide decodes the model number, lists every fault code with its meaning and the manufacturer's suggested remedy, and explains which trips usually mean the drive needs a bench repair.
The primary reference is the current Optidrive E3 IP20 user guide, document 82-E3I20-IN, Version 1.05 (firmware 3.11). The older user guide 82-E3MAN-IN, Version 2.00 (firmware 3.05), and the brochure 85-ODE3B-IN are cited only where they add information, and any differences between them are flagged. For a broader view of drive diagnostics across brands, see our general VFD error code guide.
Reading an Optidrive E3 model number (ODE-3-120021-1F12, decoded)
The nameplate model number tells you the frame size, supply voltage, output current, input phases, filter and braking configuration. Have it ready before you troubleshoot, order a replacement or request a repair. The example used in the user guide is ODE-3-120021-1F12:
| Segment | Example | Meaning |
|---|---|---|
| ODE | ODE | Product family (Optidrive E) |
| Generation | 3 | Generation digit (the "3" in ODE-3) |
| 1st digit after second dash | 1 | Frame size (1 to 5) |
| 2nd digit | 2 | Input voltage: 1 = 110–115 V, 2 = 200–240 V, 4 = 380–480 V |
| Next 4 digits | 0021 | Output current x 10 (0021 = 2.1 A, 0043 = 4.3 A, 0460 = 46 A) |
| Digit after third dash | 1 | Number of input phases (1 or 3) |
| Next character | F | Filter: 0 = no filter, F = internal EMC filter |
| Next digit | 1 | Dynamic brake transistor: 1 = not fitted, 4 = internal transistor |
| Last character | 2 | IP rating: 2 = IP20 |
The example therefore describes a frame 1, 200–240 V, single-phase input drive. It has a 2.1 A output rating, an internal EMC filter, no brake transistor and an IP20 open chassis.
For enclosed IP66 (NEMA 4X) units, the documents disagree on the last character:
- The 2017 user guide 82-E3MAN-IN uses X for IP66 non-switched and Y for IP66 switched.
- The 2022 brochure 85-ODE3B-IN uses A for "IP66 Outdoor use Non-switched" and B for "IP66 Outdoor use Switched".
Read the letter on your nameplate against the document that matches the drive's age.
A -01 suffix, as in ODE-3-120043-3F12-01, identifies the Optidrive E3 for Single Phase Motors. This variant runs PSC and shaded-pole motors, and the brochure lists it at up to 1.1 kW.
Optidrive E3 range at a glance
The table below summarizes the voltage classes, power ratings and frame sizes listed in user guide 82-E3I20-IN.
| Supply | Output | kW | HP | Frames | Output current |
|---|---|---|---|---|---|
| 110–115 V ±10%, 1-phase (voltage doubler) | 3-phase 230 V | 0.37–1.1 | 0.5–1.5 | 1–2 | 2.3–5.8 A |
| 200–240 V ±10%, 1-phase | 3-phase | 0.37–4 | 0.5–5 | 1–3 | 2.3–15.3 A |
| 200–240 V ±10%, 3-phase | 3-phase | 0.37–18.5 | 0.5–25 | 1–5 | 2.3–72 A |
| 380–480 V ±10%, 3-phase | 3-phase | 0.37–37 | 0.5–50 | 1–5 | 1.2–72 A |
Points from the manual that matter for troubleshooting:
- Brake transistor: frame 2 and larger units have a built-in brake transistor. Frame 1 has none.
- Frame 5 filter: frame 5 models are supplied only with the internal EMC filter.
- Phase imbalance: the manual allows a maximum of 3%. An imbalance above 3% trips the drive.
- Single-phase supply on three-phase models: three-phase models can run from a single-phase supply at up to 50% of their maximum rated output current.
- Ambient temperature: IP20 open drives are rated for −10 to 50 °C operating ambient. Storage is −40 to 60 °C, and humidity must stay at or below 95% non-condensing.
- Altitude: the maximum is 2000 m, with a 1% derate per 100 m above 1000 m.
Optidrive E3 fault codes: complete list with meaning and fix
When the drive trips, it shows the fault code on the display. The table below reproduces every code in the "Fault Code Messages" table (section 10.1) of user guide 82-E3I20-IN, exactly as printed, including case and spacing. The "What to check" column follows the manufacturer's suggested remedy.
Note: Codes and meanings can vary by model, firmware and catalog number, so always confirm against the manual for your specific drive.
| Code | No. | Meaning | What to check |
|---|---|---|---|
| no-Flt | 00 | No fault | No action required. |
| OI-b | 01 | Brake channel over current | Check the external brake resistor condition and its connection wiring. |
| OL-br | 02 | Brake resistor overload | The drive tripped to protect the brake resistor. Review the braking duty and the deceleration settings. |
| O-I | 03 | Output over current (instantaneous) | Excess load or shock load on the motor. The trip cannot be reset immediately because a built-in delay lets the power components recover. |
| I.t-trp | 04 | Motor thermal overload (I2t) | The drive delivered more than 100% of the P-08 value for a period of time. Check the motor load and the P-08 motor current setting. |
| O-Volt | 06 | Over voltage on DC bus | Check the supply voltage is within tolerance. If the trip occurs on deceleration or stopping, increase P-04, or fit a suitable brake resistor and enable braking with P-34. |
| U-Volt | 07 | Under voltage on DC bus | The supply voltage is too low. This trip is normal at power-down. If it occurs while running, check the supply and every component in the power feed to the drive. |
| O-t | 08 | Heatsink over temperature | Check the ambient temperature is within specification and that cooling air circulates freely around the drive. |
| U-t | 09 | Under temperature | The drive temperature is below the minimum limit and must be raised before the drive will operate. |
| P-dEF | 10 | Factory default parameters loaded | The manual gives no remedy. Re-enter the application parameters. |
| E-trip | 11 | External trip | A trip was requested on digital input 3 because a normally closed contact opened. If a motor thermistor is connected, check whether the motor is too hot. |
| SC-ObS | 12 | Optibus comms loss | Check the communication link to the external devices. Make sure each drive on the network has a unique address. |
| FLt-dc | 13 | DC bus ripple too high | Check that all incoming supply phases are present and balanced. |
| P-LOSS | 14 | Input phase loss trip | Check that all incoming supply phases are present and balanced. |
| h O-I | 15 | Output over current | Check the motor and motor cable for short circuits. A built-in delay prevents an immediate reset. |
| th-Flt | 16 | Faulty thermistor on heatsink | The manual gives no remedy. The fault concerns the drive's own heatsink temperature sensing. |
| dAtA-F | 17 | Internal memory fault (IO) | Press the Stop key. If the fault persists, consult your supplier. |
| 4-20 F | 18 | 4-20 mA signal lost | Check the analog input connections. |
| dAtA-E | 19 | Internal memory fault (DSP) | Press the Stop key. If the fault persists, consult your supplier. |
| F-Ptc | 21 | Motor PTC thermistor trip | The connected motor thermistor reports over temperature. Check the wiring connections and the motor. |
| FAN-F | 22 | Cooling fan fault (IP66 only) | Check or replace the cooling fan. |
| O-hEAt | 23 | Drive internal temperature too high | The ambient temperature around the drive is too high. Check that adequate cooling air is provided. |
| OUT-F | 26 | Output fault | A fault on the drive output, such as a missing phase or unbalanced motor phase currents. Check the motor and its connections. |
| AtF-02 | 41 | Autotune fault | The motor parameters measured during autotune are incorrect. Check motor cable continuity and confirm all three motor phases are present and balanced. |
| SC-F01 | 50 | Modbus comms loss fault | Check the Modbus RTU cable. Make sure at least one register is polled cyclically within the timeout set in P-36 Index 3. |
| SC-F02 | 51 | CAN comms loss trip | Check the CAN cable. Make sure cyclic communication occurs within the timeout set in P-36 Index 3. |
The manual writes some codes differently in other sections:
- The parameter pages write the 4–20 mA loss trip as "4-20F".
- The overload trip appears as "I.t-trP" and "It.trp" in some passages.
The forms in the table above follow the fault code table itself.
Several of these trips are thermal or environmental: O-t, O-hEAt and FAN-F. Repeated thermal trips shorten component life. Our article on extending VFD service life covers enclosure cooling and maintenance practices that reduce them.
Additional codes in the older 82-E3MAN-IN manual
The 2017 user guide 82-E3MAN-IN (Version 2.00, firmware 3.05) lists a few codes that are not in the current table. They may appear on drives running older firmware.
| Code | No. | Meaning | What to check |
|---|---|---|---|
| PS-trp | 05 | Power stage trip | Check the motor and connection cable for short circuits. |
| AtF-01 | 40 | Autotune fault | The motor parameters measured during autotune are incorrect. |
| AtF-03 | 42 | Autotune fault | Check all three motor phases are present and balanced. |
| AtF-04 | 43 | Autotune fault | Same autotune fault group as AtF-01 to AtF-03; the older manual gives no separate remedy. Follow the group checks: motor cable continuity and all three motor phases present and balanced. |
| AtF-05 | 44 | Autotune fault | Same autotune fault group as AtF-01 to AtF-03; the older manual gives no separate remedy. Follow the group checks: motor cable continuity and all three motor phases present and balanced. |
The older manual also adds two details:
- It describes U-t as occurring when the ambient temperature is below −10 °C. The drive will not start until the temperature rises above that point.
- Its reset-delay note covers trips 3, 4, 5 and 15, adding PS-trp to the list in the current manual.
Display messages that are not faults
Not everything on the E3 display is a trip. Before treating a message as a fault, check whether it is one of the following status indications from user guide 82-E3I20-IN.
- SToP: The drive is stopped or disabled. After a trip is reset with the Stop key, the display returns to "stop".
- stndby: The drive is in standby (sleep) mode under the built-in PI controller, configured with P-48. Output to the motor is disabled until the wake condition is met.
- P-dEF: Factory default parameters have been loaded. The parameter-reset section shows it as "P-def" after a factory reset, which is done by holding Up, Down and Stop for more than 2 seconds. The same message appears as code 10 in the fault table. If nobody intentionally reset the drive, investigate, because the application settings will have been lost.
- rEd: Shown when P-17 is viewed. It means the drive has automatically reduced its switching frequency from the setting (4–32 kHz, default 8 kHz) because the heatsink is too hot. It is a warning that cooling is marginal, not a trip.
- Fire: The drive is in Fire Mode. Per the manual, it "can't be reset until fire mode is deactivated".
- Running displays: "H" followed by a value is output frequency, "A" is motor current and "P" is motor power in kW. RPM appears if P-10 is greater than 0. Press Navigate for less than 1 second to cycle through them.
- Edge-r, Auto-0, Auto-1 to Auto-5: These are P-30 start-mode and auto-restart settings, not faults.
-
LED segment warnings:
- All segments a–f flashing together: overload, meaning motor current is above P-08.
- Segments a and f flashing alternately: mains loss.
- Segment a flashing: Fire Mode active.
Why U-Volt at power-down is normal: When the supply is removed, the DC bus voltage decays and the drive registers an under-voltage condition. The manual states that this trip "occurs routinely when power is removed from the drive". A U-Volt logged when power was removed, for example in the trip log after a planned shutdown, is not a fault. It needs attention only when it occurs while the drive is running. In that case, check the incoming supply voltage and every component in the power feed: disconnects, fuses, contactors and terminations.
How to reset an Optidrive E3 trip and read the trip log
To clear a trip, press the Stop key. The display then shows "stop", and the drive can be restarted once the cause has been dealt with.
Three trips have a built-in reset delay:
- O-I (3)
- I.t-trp (4)
- h O-I (15)
After these trips the drive cannot be reset until the delay has elapsed. The delay gives the power components time to recover and prevents damage. If the drive appears to ignore the Stop key straight after one of these trips, wait and try again.
If auto-restart is configured with P-30 set to Auto-1 through Auto-5, the drive makes up to 5 restart attempts, 20 seconds apart, before it locks out on the trip. Keep this in mind when reading history: one underlying problem can produce several log entries.
The E3 stores useful diagnostic data in its P00 read-only parameter group:
- P00-13 trip log: the four most recent trips, each with a time stamp. Record these before resetting parameters or removing the drive.
- P00-15 to P00-19 pre-trip logs: DC bus voltage, heatsink temperature, motor current, DC ripple and internal temperature captured before a trip. These help separate supply problems from load problems.
- P00-33 to P00-38 critical fault counters: cumulative counts of over current, over voltage, under voltage, heatsink over temperature, brake over current and internal over-temperature events. A high over-current count on a drive that now trips at every start suggests a history of stress on the output stage.
- P00-26: kWh meter, which indicates how much service the drive has seen.
When a trip means the drive needs repair
Most E3 trips are caused by the installation: load, supply, wiring, cooling or control signals. A smaller set points to a failure inside the drive. A disciplined approach to troubleshooting an industrial VFD separates the two before anyone pulls the unit.
Before working on the drive: isolate the supply and wait 10 minutes for the DC bus capacitors to discharge, as the manual instructs.
Codes that point inside the drive
- h O-I or O-I with the motor disconnected. Both are output over-current trips. The manual's remedy for h O-I is to check the motor and cable for short circuits. Disconnect the motor leads at the drive output terminals and run the drive unloaded. If the trip returns immediately, the motor and cable are ruled out, and the problem is almost certainly in the output power stage or its current sensing. On older firmware, PS-trp (power stage trip) falls in the same category.
- th-Flt. "Faulty thermistor on heatsink" refers to the drive's own temperature sensor, not the motor. No setting or field action clears a failed sensing circuit.
- dAtA-F or dAtA-E that persist. These are internal memory faults on the IO and DSP sides. The manual says to press Stop and, if the fault persists, consult your supplier. A memory fault that survives a Stop reset and a power cycle indicates a control board problem.
- FAN-F. This code applies to IP66 units only. The remedy is to check or replace the cooling fan. Fan replacement is routine, but a drive that ran with a failed fan may also show heat stress elsewhere, so it is worth inspecting on the bench.
- OI-b. Brake channel over current. First check the external brake resistor and its wiring, as the manual directs. If the resistor measures correctly and the wiring is sound but the trip persists, suspect the internal brake transistor (frame 2 and larger).
- FLt-dc with a verified supply. The manual's remedy is to check that the incoming phases are present and balanced. If you have measured a healthy, balanced supply and the drive still trips on DC ripple, the drive's internal DC bus components become the next suspect.
Codes that point to the installation
- Supply: O-Volt (supply tolerance, or regeneration on deceleration), U-Volt while running, P-LOSS and FLt-dc on an unverified supply.
- Load and motor: I.t-trp (load versus the P-08 setting), OUT-F and AtF-02 (motor connections and phase balance), and F-Ptc (motor overheating or thermistor wiring).
- Cooling: O-t and O-hEAt (ambient temperature and airflow), and U-t (ambient too cold).
- Control and communications: E-trip (external contact on digital input 3), 4-20 F (analog signal), SC-F01, SC-F02 and SC-ObS (network cabling, polling and addressing).
- Braking: OL-br (braking duty).
If installation-type trips keep recurring after the external cause has been corrected, take that seriously as well. Repeated stress events are a common precursor to power-stage damage. Our analysis of what fails inside industrial drives covers the components that typically give out. When the evidence points inside the drive, Flexa's VFD repair service diagnoses and repairs Optidrive E3 units at component level.
Sending an Optidrive E3 to Flexa for repair
Flexa Systems is an independent US supplier of new and refurbished industrial automation parts. We also repair drives at component level. We are not affiliated with Invertek. Our technicians trace the fault to the failed parts on the board or in the power section and replace those parts, rather than swapping whole assemblies.
To help us diagnose your drive quickly, include the following with the unit:
- The full model number from the nameplate, for example ODE-3-120021-1F12, including any IP66 letter or -01 suffix.
- The fault code shown on the display and, if the drive still powers up, the P00-13 trip log entries and the critical fault counter readings.
- Whether the fault returns with the motor disconnected.
- A short description of the application: motor rating, pump, fan or conveyor duty, whether a brake resistor is used, and any recent changes to wiring or supply.
- A record of your parameter settings, if available, so the drive can be set up quickly when it returns.
You can request a repair quote online before you ship. If a line is down and you cannot wait for standard handling, ask about our rush repair service. Repaired drives are tested before return and are backed by a 2-year warranty.
Repair is not always the right answer for every drive. On small frame sizes, or where the drive has extensive damage, a replacement may make more sense. Our repair vs replacement cost analysis sets out how to weigh that decision. Flexa does not stock Optidrive E3 units, but a replacement can be quoted on request. If you are open to a different platform, you can browse VFDs in stock from other brands.
To discuss an Optidrive E3 fault, arrange a repair or request a replacement quote, call Flexa Systems at (254) 254-0005.
Frequently asked questions
What is the difference between O-I and h O-I on an Optidrive E3?
Both are output over-current trips. The manual relates O-I (code 03) to excess load or shock load on the motor, and directs h O-I (code 15) toward checking the motor and motor cable for short circuits. Both have a built-in reset delay. If either trip returns immediately with the motor disconnected, the fault is likely inside the drive's output stage.
Why does my Optidrive E3 show U-Volt every time it is switched off?
U-Volt means under voltage on the DC bus. The user guide states that this trip occurs routinely when power is removed from the drive, because the bus voltage decays at power-down. It is normal in that situation. Investigate only if U-Volt occurs while the drive is running. Then check the supply voltage and every component in the power feed to the drive.
Why can't I reset an O-I trip straight away?
After an O-I, I.t-trp or h O-I trip (codes 3, 4 and 15), the Optidrive E3 enforces a built-in reset delay. The delay gives the power components time to recover and prevents damage. Pressing Stop will not clear the trip until the delay has elapsed. Wait, reset with the Stop key, and correct the cause before restarting.
Can a three-phase Optidrive E3 run from a single-phase supply?
According to user guide 82-E3I20-IN, three-phase models can be run from a single-phase supply at up to 50% of their maximum rated output current. Size the drive accordingly. Also note that the drive trips on phase imbalance above 3% and has dedicated trips for input phase loss (P-LOSS) and excessive DC bus ripple (FLt-dc).
Can Flexa repair or replace a failed Optidrive E3?
Yes. Flexa Systems repairs Optidrive E3 drives at component level as an independent repair provider, and repaired units carry a 2-year warranty. Flexa does not stock Optidrive E3 drives, but a replacement can be quoted on request. Call (254) 254-0005 with the model number and fault code to discuss the best option.
