Amana Microwave Error Code LO

The LO error code means the microwave has detected that the incoming line voltage is below 185 VAC, or the internal low voltage board has failed. The unit triggers this fault to protect its components from operating under insufficient power. It can be caused by a real voltage problem at the outlet or by a failed board inside the microwave.

Start by unplugging the unit for one minute and reconnecting it. If the error returns, use a multimeter to check the voltage at the wall outlet and confirm it is above 185 VAC. If the outlet voltage is normal, the internal low voltage board is likely inoperative and will need to be replaced by a qualified technician. If the outlet voltage itself is low, the electrical supply circuit needs to be evaluated.

If the cause is simply a low supply voltage at the outlet, there may be little to no cost if the fix involves resetting a breaker or having an electrician tighten a connection, though electrical service calls typically range from $75 to $200. If the low voltage board inside the microwave needs replacement, parts and labor costs generally range from $100 to $250 depending on the service provider and part availability. In some cases, if the repair cost approaches the price of a new unit, replacement may be worth considering.

Unplugging the microwave for one minute and then reconnecting it is the recommended first step and can clear the code if the cause was a temporary power fluctuation. However, if the underlying issue is a persistent low supply voltage or a failed low voltage board, the LO code will return after the reset. Always retest after unplugging to determine if the fault is recurring.

Yes, operating a microwave on voltage below its rated minimum can stress internal components such as the magnetron and capacitor, potentially shortening their lifespan or causing further damage. The LO code is a protective fault designed to prevent the unit from running under these conditions. Do not attempt to bypass or ignore the error, and address the underlying voltage or board issue before continuing to use the microwave.