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Originally Posted by PJL
I am not too sure what is going on. Measure the resistance from UL41 pin 4 (green) to chassis.
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Do that with the UL41 unplugged, so any faults with it do not affect the reading.
You can check the health of the UL41 heater by unplugging it and measuring the resistance between pins 1 and 8 which are either side of the pip in the glass. Measure on the valve, not on the holder. Make sure your probes or clips don't touch each other. Expect a reading of about 70 ohms. That's what I measured on a sample.