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Old 09-20-2021, 10:41 AM   #1
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Atwood water heater trips 110v breaker

I have an Atwood XT that trips the 15amp breaker. It works on propane .I have tested the breaker and is not the issue. Any suggestions before I pull this thing out as I have zero access to the rear. Thanks in advance. I forgot to mention that it trips the breaker even with the heater in the off position.
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Old 09-20-2021, 11:18 AM   #2
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Atwood XT uses same controls as the standard combo water heater
XT just uses a higher t-stat set point (155*F) and a Mixing Valve to control hot out at 130*F

Controls for Propane and Electric functions are via DC Voltage
Everything for gas/electric uses same DC, same circuit board, same T-stat/ECO etc
Electric uses a DC relay that closes and allows AC to the electric element

120VAC comes from the 15A CB to that DC Relay then from relay to element
15A CB tripping is 120VAC issue either at the DC Relay (AC Black Wire melted/shorting) or at the Element (element shorted)

So only way to diagnosis is AT the DC Relay and the Element...both of which are on back side of the WH Tank under the Protective cover

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Old 09-20-2021, 11:48 AM   #3
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Quote:
Originally Posted by Old-Biscuit View Post
Atwood XT uses same controls as the standard combo water heater
XT just uses a higher t-stat set point (155*F) and a Mixing Valve to control hot out at 130*F

Controls for Propane and Electric functions are via DC Voltage
Everything for gas/electric uses same DC, same circuit board, same T-stat/ECO etc
Electric uses a DC relay that closes and allows AC to the electric element

120VAC comes from the 15A CB to that DC Relay then from relay to element
15A CB tripping is 120VAC issue either at the DC Relay (AC Black Wire melted/shorting) or at the Element (element shorted)

So only way to diagnosis is AT the DC Relay and the Element...both of which are on back side of the WH Tank under the Protective cover

Thanks for the reply Old Biscuit . Aside from the obvious melted wire, is there an ohms test for the relay or element?
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Old 09-20-2021, 11:58 AM   #4
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You can do some testing on element......120VAC 15A tripping so its an AC issue

Element:
Disconnect wires and check continuity
1)Voltmeter RED Probe on Black wire screw/BLACK Probe on White wire screw
*No Continuity...element is burnt out
2)Voltmeter RED Probe on Black wire screw/BLACK Probe on element flange
*Continuity....element is shorted (most likely cause of CB tripping)

Visual inspection of Black wire connections/wiring on DC Relay



**15A CB trips due to high amps
Burnt out element---no current thru so no amps
Shorted element...high amps
Melted/shorted AC wiring on DC Relay...high amps
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Old 09-20-2021, 12:02 PM   #5
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Quote:
Originally Posted by Old-Biscuit View Post
You can do some testing on element......120VAC 15A tripping so its an AC issue

Element:
Disconnect wires and check continuity
1)Voltmeter RED Probe on Black wire screw/BLACK Probe on White wire screw
*No Continuity...element is burnt out
2)Voltmeter RED Probe on Black wire screw/BLACK Probe on element flange
*Continuity....element is shorted (most likely cause of CB tripping)

Visual inspection of Black wire connections/wiring on DC Relay



**15A CB trips due to high amps
Burnt out element---no current thru so no amps
Shorted element...high amps
Melted/shorted AC wiring on DC Relay...high amps
Thank you!! You are a wealth of information!!
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Old 09-20-2021, 05:20 PM   #6
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Well I pulled out my water heater and found this! At least I know the circuit breaker works! The heating element was good but since I had a spare, I replaced it anyways. Thanks for the help Old-Biscuit!
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Old 09-20-2021, 07:22 PM   #7
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that is a nightmare installation

Loose connections equals high amp load equals HEAT equals melting/shorting


Floor Jockey working Piece-Mill equals JUNK


Thanks for the update!
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