Nice pic pattern part lmao
Nice pic pattern part lmao
If my understanding is correct, the NTC thermistor is used (along with the user control knob setting) by the temperature control PCB to modulate the flame/output.
The on/off flow thermostat, lower down, is a backstop in case the control circuit fails, and is therefore in series with the gas valve operator. And even though this overheat thermostat never fails in the closed circuit state roll there's a second overheat detector, operated by a capillary tube, that operates only when superheated water is banging out of the heat exchanger
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