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joebedford's avatar
joebedford
Nomad II
Jan 02, 2024
Solved

Suburban SW12DEL Water Heater On/OFF switch melts???

I know similar threads cover close to this subject, but they're old and don't quite answer my question. I have a 2011 5th wheel. Last winter (I'm a snowbird) the switch on the heater failed (melted)...
  • Krusty's avatar
    Krusty
    Jan 02, 2024

    How is the wiring connected to the switch? Is there some type of connector? If so, perhaps the connection is becoming loose or building up resistance. Make sure connections are clean and tight too.

opnspaces's avatar
opnspaces
Navigator II
Jan 04, 2024

I don't see the second schematic. But based on your first schematic I would try disconnecting the black wire right at the upstream or switch side of the Hi-Limit. Then turn on the switch and see if it lights up. If it does light up then there is a relay somewhere allowing the switch circuit to ground. This is expected for a relay and should not cause any melting. My thought is by disconnecting the Hi-limit and thermostat and heating element you isolate and remove all potential load from the circuit so you are only looking at and troubleshooting the control part of the circuit.

But if the switch does light up and then heats up I would be looking for that relay.

 

 

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