Amana Microwave Error Code Err3

Err3 indicates a hardware problem with the high voltage board or the wiring connected to it. The microwave's control system has detected a fault in the circuit responsible for generating the high-powered energy used to heat food. The unit shuts down to prevent further damage or a safety hazard. The fault must be resolved before the microwave will operate again.

No, the microwave should not be used while displaying Err3. The code indicates a fault in the high voltage circuit, which is a critical safety system. Operating the unit in this condition could worsen the damage or create a hazard. Beyond that, the microwave's own control system will prevent normal operation until the fault is resolved.

High voltage board replacement is a task that carries serious safety risks for those without appliance repair experience. Microwave capacitors can retain a lethal charge even after the unit is unplugged and must be properly discharged before any internal components are handled. If you are comfortable with those precautions and have the correct replacement board, the swap is mechanically straightforward. Otherwise, this repair is best handled by a qualified technician.

A power reset is the recommended first step: unplug the microwave for one full minute, then restore power and retest. If the fault was a temporary glitch, the code may not return. However, if Err3 reappears after the reset, there is an underlying hardware issue with the H.V. board or wiring that requires physical inspection and likely a part replacement.

If the fix is simply reseating a loose wiring connector, there may be no parts cost involved, just the time for diagnosis. If the high voltage board needs to be replaced, parts and labor combined typically range from around $100 to $250 or more depending on the model and who performs the repair. For older or lower-cost microwaves, it is worth comparing the repair cost against the price of a replacement unit.