Thermostat thermal runaway protection logic

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Just for information, the dominant failure mode of a MosFET is all leads become shorted to each others.

You didn't say what thermistor you have, I'll assume a typical 10K NTC.
My first test of the read analog signal is:

  1. Is it within the expected resistance range (for the expected temperature)
  2. Has it changed within the last xxx readings.
  3. I like your test of 4 readings should show some effect of heat on or heat off.
  4. You should enable the WDT in you processor.

Just some thoughts.

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