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Old 03-29-2013, 01:43 PM   #1
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solved- 378TS elect water heater mystery

I have a mystery on my hands. Have 120v at HWH breaker ( phase -neutral) nothing @ load or line side of hi limit/ thermosat, nothing at line side of WH switch. Is it that I'm not measuring right ? For switch I put 1 lead of tester into wires coming to switch ( did both in case in case I had wire going to HL/ Stat and not breaker ) the other on water heater casing ( ground?)- nothing. For H/L Stat again 1 lead on line side ( and just in case load side ) the other on water heater tank again nothing.
Can anyone out there tell me if I'm doing this right . Frankly I'm concerned - if I'm doing it right this could mean a broken wire between breaker and water heater and if that's the case the breaker should've tripped

Thanks
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Old 03-29-2013, 01:58 PM   #2
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Did you turn on the switch in the lower left hand corner of the hot water heater? (outside) see picture. This must be on to run off electric.

Please take a look before I say anymore.

You also failed to tell us what year and model Georgetown you have.
You also may have a swtich inside on the control panel you need to turn on electric.
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Old 03-29-2013, 04:15 PM   #3
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Actualy I removed the wire leads from the switch to try to determine if the switch was faulty ( internals of switch broken) there was no sign voltage coming to switch ( as I said I tested both wires connected to switch in case one of them was the wire going on to the hi limit/ stat ) . There's also no other 120v switch like you have inside the coach - only a switch 12v dc control circuit for propane side of water heater
My MH is a 2012 Georgetown Model is a 378TS
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Old 03-29-2013, 04:20 PM   #4
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Sorry meant to say only interior switch is for 12vdc control circuit for propane side of water heater Electric heating is switched on and off with outside switch at water heater ( the one you indicated)
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Old 03-29-2013, 06:08 PM   #5
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Quote:
Originally Posted by Nomore9-5 View Post
Sorry meant to say only interior switch is for 12vdc control circuit for propane side of water heater Electric heating is switched on and off with outside switch at water heater ( the one you indicated)

Then the only things I can suggest it turn off the circuit breaker in the bedroom panel then turn back on.
Are you sure you have 120 volts to the motorhome?
Does your microwave work?
If you still don't know it is time to get some help by someone who knows about electricity.
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Old 03-30-2013, 06:48 AM   #6
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Just a note. Circuit breakers trip because of high current draw. If a circuit breaker load side wire breakes it will only trip if the wire shorts to ground ( max current draw). If the wire breakes and does not short to ground it would be the same as turning off the switch (no circuit breaker pop). Additionally; It could be that the ground return for the heating element could be isolated and therefore the tank would not be a good ground source for voltage checks.
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Old 03-30-2013, 07:54 AM   #7
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Most water heaters are plugged into a receptacle which can be accessed from
the BACK side of the water heater tank.
Open a hatch or remove a panel or do what ever you need to do to access
the rear of your WH. Check for 120 v at that outlet and of course check
to see the WH is firmly plugged in to that outlet.

Check for 120v across the outlet, hot to neutral.
Then just FYI check from hot to tank. You should have voltage both
ways but you must have voltage across the outlet.
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Old 03-30-2013, 07:57 AM   #8
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If you have 120v at the circuit breaker load side and 0 volts at the switch line side then yes you have an open power wire or wire is not routed correctly.
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Old 03-30-2013, 08:14 AM   #9
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See my previous post-- check for power at the outlet before you go any
further.
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Old 03-30-2013, 09:01 AM   #10
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Quote:
Originally Posted by KyDan View Post
Most water heaters are plugged into a receptacle which can be accessed from
the BACK side of the water heater tank.
Open a hatch or remove a panel or do what ever you need to do to access the rear of your WH. Check for 120 v at that outlet and of course check to see the WH is firmly plugged in to that outlet
I imagine most people laughed at that suggestion, but it ain't funny!
That is exactly what happened with ours. I guess the guy who installed the heater wasn't strong enough to push the plug all the way into the outlet, and it did fall out!
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