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Old 07-11-2018, 04:07 PM   #1
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Join Date: May 2006
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M.O.C. #5757
Stuck water heater switch

Just got set up yesterday for 33 days on Mustang Island on the Texas Gulf Coast. Noticed last night the water in the shower was only lukewarm. Went out this morning to check, thought maybe the anode needed replacement. Since we almost always have full hookups we run the water heater on electric. The switch to turn of the water heater outside is stuck in the "On" position. Anybody ever have just the switch go bad? This morning I did turn on the gas inside and got hot water, and this afternoon the water heater seems to work fine, but the switch is still stuck in the ON position. I have always been told to never drain the water heater or change the anode without turning the switch OFF or something might get get "burnt up". Thanks for any advice.
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Old 07-11-2018, 04:40 PM   #2
carl n susan
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M.O.C. #4831
That switch fails regularly. While it is in the ON position, it obviously working as in the OFF position. There is no reason to suspect a fried heater element as long as you haven't drained the WH while hooked up to electricity.

The switch just pops out of it's slot. Easy to replace.
Carl (n Susan) Youngren
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB

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Old 07-11-2018, 07:36 PM   #3
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M.O.C. #6433
Assuming you have a Suburban water heater. There have been a number of posts about that little black rocker switch going bad.

FYI. There is an electrical heating element that heats the water. And there is a non-electrical anode rod that protects the water heater from corrosion. Two different devices.
Bill & Patricia

2007 3075RL
2012 F350 SRW CC LB FX4 6.7
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Old 07-11-2018, 08:17 PM   #4
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When ours failed, I spliced the switch wires in the on position and used the inside switch. Never did get around to replacing the outside switch.
Mike and Lorraine
2002 3655 FL, 2005 3650RK
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Old 07-13-2018, 05:34 AM   #5
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M.O.C. #20913
It is very inexpensive to replace this switch. It is also very easy to pry out -- wires just plug in. Be sure to retain the rubber gasket which fits around the switch, since this is not included with the new switch.
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Old 07-13-2018, 11:50 AM   #6
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DrJJJ---you might see if the RV Park has a few Mobile RV techs that they recommend and have the repair done by the RV Tech. I would guess that Port Aransas will probably not have a store with that switch--might have to get it in Corpus. Tell the mobile tech to bring a switch for the water heater with him out to the island--other wise it is a long trip to CC and back. Hope this helps,
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Old 07-13-2018, 12:49 PM   #7
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Thanks for all the advice. The park we are staying in recommended an excellent mobile RV service. They came the next day and replaced the switch at a very reasonable cost.
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