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So it heats or cools forever once it clicks on to that position? But is that random or can you control that?
If you can control it, then the brains probably work (and probe).
Then it may be as simple as a resistor that has given up (a pulldown on the coil control line). For the coil to release it should see under 1.2V (and over 9V to activate). You could measure that and see what it does.
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