I am troubleshooting a 240V hot tub circuit. The problem is (I think) that the heater is getting about 30V when it is supposed to be off, and tripping the overheat relay, after a few minutes. When the heater is on, I see 240V across the leads, at the heater. When the overheat is tripped, I see 0V across the leads. When it is supposed to be off, I see 30V across the leads, and going from each heater lead to the neutral supply wire, I see 120V on one, and 90V on the other. I already replaced the relay, feeding the heater. Where else would this voltage be coming from? I do not have a schematic.
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