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Old 08-08-2010, 08:13 PM   #1
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Question Bad Water Heater Switch?

I usually run the water heater off electricty, but I'll throw a breaker with the AC, refrig, tv and micro running at the same time. So if I need all going at the same time I change the refrig and water heater to gas. I've only done this 3 or 4 times since I've owned the trailer.

This last time the heater wouldn't run off the gas, but everything else did. The red switch wouldn't light up, nothing. After several tries I removed the switch and checked the connections and to see if it's getting juice. All looked good. I replaced the switch, try it again and still nothing.

The next morning I try it again the red light comes on and it fires up (red light goes off after the heater fires up, as it should). I give it time to heat the water, run the water until it cycles through and fires up again. Everything is good.

Anyone have any clue why it's doing this? Maybe the switch is bad?
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Old 08-08-2010, 08:42 PM   #2
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You say you had been running the heater on AC then turned it off. I have noticed that the electric side will heat a bit hotter that the thermostat for the gas side is set for. There is also residual heat in the element if it was on when you turned the power off to it. For this reason the water is already hot (hotter than the thermostat for the gas side) and when you turn on the switch for the gas side nothing will happen until the water in the heater cools to below the set point for the gas thermostat.

Sound plausible? I don't know if I'm right but it's the conclusion that I have come up with when mine does this. Nothing seems to be out of sorts.
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Old 08-08-2010, 09:21 PM   #3
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Thanks NWJeeper.

That sounds like what is probably going on. I'll check it a few times during the week when I know the water isn't heated.

That's if the water will cool down. Temps are predicted to be in the 100's all week.
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