Wolf Convection Microwave Code Fire Sense: Fire Detected, Shutdown

What Fire Sense means

On Wolf convection microwaves such as the MWC24 and MC24, Fire Sense is the automatic fire detection in microwave mode. The control samples the thermistor circuit every 32 seconds, and a rise of 300 mV over the previous reading is judged to be a fire. It then cuts the relays to the power transformer, fan and convection motor, stops the countdown and closes the damper. You will see the oven stop suddenly.

Common causes of Fire Sense

Food or packaging actually burning or smoking in the cavity
Thermistor circuit reading a sudden jump
Control reacting to a sensor reading that changed too fast

✓ One safe check you can try

1. Keep the door closed and press stop. 2. If you see flames or smoke, leave the door shut, switch off the breaker and call emergency services. 3. If it was a false alarm, wait until the cavity is cool before opening the door. 4. Wipe out any residue and air out the kitchen. 5. If it shuts down again with nothing burning, call us.

! Why to stop there

A fire alarm shutdown may mean there was real heat, so we check carefully before reuse.
The thermistor circuit and relays are high-voltage areas in a microwave.
We provide a written quote first and a 30-day workmanship warranty.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Fire SenseFire Sense questions

How does Fire Sense decide there is a fire?

Every 32 seconds the control samples the thermistor circuit. A rise of 300 mV over the previous reading is treated as a fire. Whatever we replace is covered by our 30-day workmanship warranty.

What happens when it triggers?

Relays to the power transformer, fan and convection motor are cut, the countdown stops and the damper closes. Guessing at parts costs more than a clear diagnosis, so we test first.

Can it trigger without a fire?

It can react to a fast reading change, such as a sensor circuit problem. If nothing was burning and it repeats, we should test it.