Maytag Microwave Error Code Err8

Err8 indicates that the microwave has detected an over temperature condition inside the appliance. The error specifically involves the convection heating circuit, including Triac TR2 and Relay K3, which control the convection heater. A thermal limiter is also part of the safety system that monitors and responds to excessive heat. This code is a protective shutdown to prevent component damage or a fire hazard.

No, you should not continue using the microwave while Err8 is active. This code indicates a potentially dangerous overtemperature condition tied to the convection heating system. Using the appliance with a shorted triac or a stuck relay could cause further component damage or create a fire risk. The unit should remain unplugged until the fault is properly diagnosed and repaired.

Repair costs vary depending on which component has failed. A thermal limiter replacement is generally the least expensive repair, typically in the range of $50 to $150 including parts and labor. Replacing Relay K3 or Triac TR2 falls in a similar or slightly higher range. If the control board is the root cause, costs can rise to $150 to $350 or more depending on parts availability and labor rates in your area.

Pressing STOP/RESET twice is the recommended first step and may clear the code if the overtemperature event was temporary, such as a ventilation issue that has since resolved. However, if the underlying cause is a failed Triac TR2, a stuck Relay K3, or a blown thermal limiter, the error will return as soon as the unit attempts to run the convection heater again. A reset alone is not a repair.

Start by pressing STOP/RESET twice to attempt a reset. If the code returns, the repair process involves testing Relay K3 to confirm it is cycling correctly, checking Triac TR2 for a short circuit condition, and testing the thermal limiter for continuity. Any component that fails testing will need to be replaced. Because this diagnosis involves the high-voltage convection heater circuit, it is recommended for technicians or experienced DIYers who understand appliance electrical safety procedures.