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  #1  
Old 2 Weeks Ago
Captain Fred Captain Fred is online now
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Default Water heater sensor

Our 1987 FC has a sensor that screws into the hot water outlet elbow. It has one wire on it and the screw that the wire goes on appears to also be the adjustment, I assume for the temp setting on it. This switch energizes the relay for the water heater.
Does anyone know where this sensor/switch is available ? And how to adjust/test for correct limits ?
The water heater was replaced by PO but switch seems to be original.
Thanks, Fred
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1987FC35SB
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Clueless Clueless is online now
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Some of those water heater outlet sensors actually detected water level to be high enough to allow the heating element to turn on.
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Old 2 Weeks Ago
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That's just a water presence sensor. It will trigger a relay in the electrical box nearby to keep you from running the element while dry. When I replaced my water heater I was able to reuse the old one. I didn't have much luck finding a replacement but also didn't look too hard.

The screw should be just to hold the wire.
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What those guys said, that is just to sense the presence of water in the water heater so it doesn’t turn on and burn out the heating element. If it’s not working you can clean it, maybe soak it in vinegar. It’s a simple switch, if it’s not working you can just ground the wire to something it should switch the relay.
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Old 2 Weeks Ago
Captain Fred Captain Fred is online now
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thanks guys
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Here is a pic of the sensor circuit board. It was wrapped with heavy tape and stuffed in the electrical box with the relay. The two white wires on the end lead to the sensor. The red and white on the other end provide power and the black wire energizes the coil (as I recall, but never wrote down)

As I remember the relay fed the lighted switch which then fed the hot water heater.

This is from my 86 PT. on the street side wall just above the hot water heater,
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