PreservedSwine
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Just looking for some advice. I saw you had responded several years ago about a 1994 HotSpot (Model Z) to another user. I have one of these also that is still in pretty good shape. It was running well up until a few months ago when the heater stopped. I took everything out to my bench and have been looking at it. I have continuity through the heater and the pump is strong. After reading your response, I was wondering if I should check the capacitors first and then the relays? When the pump is disconnected from control box (for bench testing so I dont run it dry), I get a clicking when i turn the temp knob but i do not get any power at the heater connections. That is why I am thinking that the relay is not triggering. The relays are clicking. Appreciate if you have the time for any advice on the proper flow for troubleshooting. Thanks!
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I have a similar problem - my coleman horizon 400 spa heater not turning off. I set temp to 80 but heater heats water until high temp sensor shuts down spa (usually around 110 degrees) sn1 and after a while after cooling I get the OH code and than I can restart the spa. But, the heater seems to continue to operate. I hear a hum from the heater area as if the heater is always on. I shut down the whole spa over night to cool. When I turned on the spa again, the heater got hot to touch pretty quickly - the water temp this morn was 104 degrees at startup, the hight temp sensor triggered again. any idea. hope you understand.