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Error code reference

Continental Washer Error Code A-07

Over voltage during deceleration in the DC link circuit, inverter displays OU2.

Continental codesContinental washer codes

Over voltage during deceleration in the DC link circuit, inverter displays OU2.

First step from the service manual

Using a voltage meter, measure across machine power supply terminals L1 to L2, L2 to L3, and L1 to L3 to verify readings are within 208-240 volts and within +/- 2 volts of each other.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What A-07 means on a Continental washer

Error code A-07 on a Continental washer indicates an over-voltage condition occurring specifically during deceleration in the DC link circuit of the inverter drive. When the washer's motor decelerates (slows down), the motor temporarily acts as a generator, feeding voltage back into the inverter's DC bus. If the incoming supply voltage is already elevated or unbalanced, this regenerated energy can push the DC link voltage beyond the inverter's acceptable threshold, triggering the OU2 fault and halting operation. The inverter displays OU2 internally as a companion indicator to the machine's A-07 code.

The DC link circuit is the internal DC bus inside the variable frequency drive (inverter) that converts and conditions power before delivering it to the wash motor. Voltage levels in this circuit are directly influenced by the quality and stability of the incoming AC supply. If supply voltage is running high or if significant phase-to-phase imbalance exists, the inverter cannot safely absorb the back-EMF generated during motor deceleration, and the protection circuit trips to prevent component damage.

The first and most critical diagnostic step is to measure the line voltage at the machine's power supply terminals: L1 to L2, L2 to L3, and L1 to L3. All three readings must fall within the 208-240 volt range and must be within plus or minus 2 volts of each other. Readings outside this window, or significant imbalance between phases, point directly to a supply-side issue that must be resolved before further inverter diagnostics are performed.

Source: manufacturer service documentation.

Common causes of A-07

  1. 01

    High or out-of-range supply voltage

    Wiring / connection

    If the incoming line voltage exceeds 240 volts, the DC link circuit can be pushed over its limit during motor deceleration. Measure L1-L2, L2-L3, and L1-L3 at the machine terminals to confirm all readings are within 208-240 volts.

  2. 02

    Phase voltage imbalance

    Wiring / connection

    If the three phase-to-phase voltage readings differ by more than plus or minus 2 volts of each other, the unbalanced supply creates unstable conditions in the DC link during deceleration. This is typically a facility wiring or utility supply issue.

  3. 03

    Facility wiring or connection problem

    Wiring / connection

    Loose connections, undersized wiring, or a failing breaker at the panel can cause momentary voltage swings that coincide with motor deceleration loads. Inspect all connections from the panel to the machine terminals for tightness and condition.

  4. 04

    Faulty inverter drive board

    Part replacement

    If all incoming supply voltages are confirmed correct and balanced, the inverter's internal DC link circuit or braking components may be failing to properly absorb regenerative energy during deceleration. This would require inverter board inspection or replacement.

  5. 05

    Utility supply voltage fluctuation

    Wiring / connection

    Intermittent over-voltage events from the utility grid, such as those caused by large loads cycling on and off in the building, can trigger A-07 without any fault in the machine itself. Monitoring supply voltage over time or consulting the utility may be necessary.

See the test procedure for each cause

Frequently asked questions about A-07

What does A-07 mean on a Continental washer?
A-07 indicates an over-voltage condition in the inverter's DC link circuit that occurred during motor deceleration. The inverter also displays OU2 as a companion fault code. The machine shuts down automatically to protect the inverter and motor components from damage caused by excessive voltage on the DC bus.
How do I fix error code A-07 on a Continental washer?
Start by measuring the supply voltage at the machine's terminal connections: L1 to L2, L2 to L3, and L1 to L3. All three readings must be within 208-240 volts and within plus or minus 2 volts of each other. If voltage is out of range or unbalanced, the issue is with the electrical supply and must be corrected at the panel or by the utility before the washer will operate reliably. If supply voltage checks out, the inverter drive board may require further inspection.
Is it safe to keep using my washer when error A-07 appears?
No, you should not continue operating the washer while A-07 is active. The error indicates voltage levels in the inverter's DC link circuit have exceeded safe operating limits. Continued operation under these conditions risks permanent damage to the inverter drive and motor components. Resolve the supply voltage issue first before resuming use.
Will resetting the washer clear the A-07 error code?
A reset may temporarily clear the A-07 display, but if the underlying supply voltage condition is not corrected, the fault will return during the next deceleration event. The inverter's protection circuit will continue to trip until the incoming voltage is confirmed within the 208-240 volt range with no more than plus or minus 2 volts of phase imbalance. Address the root cause before relying on a reset.
How much does it cost to repair a Continental washer showing error A-07?
If the cause is a supply voltage or wiring issue, costs typically range from minimal panel connection repairs up to several hundred dollars for an electrician to correct facility wiring or supply problems. If the inverter drive board itself has been damaged and requires replacement, parts and labor costs can range from several hundred to over a thousand dollars depending on the unit and service provider. Diagnosing the supply voltage first, before assuming a parts failure, can help avoid unnecessary expenses.

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