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The high tempreture cutout switch trips at least once a day. things to look for?

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The high temp switch is bad replace or have it replaced.

Btw, I’m available to help over the phone in case u need at

Posted on Jul 22, 2010


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Reset button on a o smith keeps tripping

After the high limit trips once, it is no longer calibrated. Replace the upper stat and limit.

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Why is it tripping?! what can i try next? thanks

Is their not two elements, one at the top too? If it is tripping on the high limit switch it could be the thermostat Try checking the grounding of the unit.


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Why is the dometic hot water heater not heating with 110 ac

This is assuming you have a 110vac unit. Could be breaker tripped in house, or high limit thermostat tripped on water heater, but most likely a burnt out element.

Btw, I’m available to help over the phone in case u need at

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I have a Bosch Powerstar AE125 where the left cut-out trips. This problem began at the end of last winter to the point I was resetting multiple times a week. During the entire summer I might have had to...

I suppose I would ascertain that the supply voltage is the same there as the outer cutout connectors. If equal, the breaker can be faulty. Worse case the heater has an intermittent short causing overload to trip out.
Fix It!

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I have a powerstar ae115 water heater that is 3 years old. The thermal cutout onthe left side keeps tripping. after shutting off the shower the temp on the top of the unit is reaching 185*f. I have...

You've done the required first-step troubleshooting and maintenance.
If thermal cutout keeps tripping, and unit is actually reaching 185, then something is wrong with wiring, temperature sensor, gas valve, or PC board. Or combination of factors.
Call service technician, and open following link for some Bosch tankless resources including Bosch contact information:

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I have an Intermatic WH-40 timer set up on swimming pool pump. I am not using any start/stop mechanical pieces on the dial face. Yet my pump does shut off everyday for short time period. Why is this...

Sounds like pump issue or loose wire and not the timer.
Check wiring at pump. Read pump manual. The pump may have overheat cycle that trips off and then comes back on to protect pump without requiring owner to press reset button each time.

If timer turns OFF, then the manual override lever moves to the off position, and when timer turns ON again, the override lever moves to the on position. If override lever is moving without a tripper, then I would like to know more about that. Add a comment with photo posted on Flickr.

Same with the circuit breaker. The circuit breaker switch does not trip and reset once a day.

A loose wire could cause occasional connect-reconnect.
Check terminals inside timer for signs of high heat and burning. Check that insulated part of wire is not under the screw-down-plate.

Check circuit breaker for signs of burning and smell of electrical burning and sound of shorting on the busbar.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

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1 Answer

Reset trips every so often

how big is the trip? the most likley thing this is,,, its an earth leake from the heating coil or there is a spark on the thermostat switch,,,,every time it switches its self on or off the trip pops out? yes?
check it out for earth leaks? ,,,befor it kills you!,,,,

Nov 28, 2010 | Reliance & 50gal Electric Water Heater

1 Answer

My electric water heater keeps tripping the high temp cut off switch every day. I've replaced the thermostat and the problem still occurrs.

the element is shorted out causing this issue.
I have had that happen to me before.
or there is a water leak dripping down on it and causing it to trip the reset switch.


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Water tank will not light to heat water. I changed the thermol coupling that didn't work, what could be the problem?

The T.C.O switch which is located on the outside of the burner area needs replacing. It has two wire that connect to it from the gas valve. This switch controls the gas to the pilot burner tube. If it has tripped it will not allow the
pilot to stay lit or allow gas into the pilot tube.

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Junkers WR18-2B very close to Bosh GWH 1600H-NG does not ignite. Sparks are there, gas is flowing, once ignited it keeps firing but it doesn't start automatically. My Junkers WR18-2B does not ignite automatically. Please note that this water heater does not have a turbine like the Bosh GWH 1600H but it gets power from a couple of D alkaline batteries. Apart from this, they are identical. Symptom: when the water starts to flow, the water sensor works correctly and starts letting the batteries providing power to the electrode. The sparks can be seen and heard. The sparks form between the electrode and the small spiral at the end of the pilot burner tube. The pilot burner gas valve is working because I noticed that it is possible to ignite the gas just out of the valve and before the start of the pilot burner tube. If I try to ignite with a match, warming the thermo sensor, the led light at the bottom lights up and the main gas valve opens, providing gas to the main burner which is fully ignited. At this point it's possible to take a shower, until the water is close and then... a new match is required. I'm puzzled because I'm not getting what is wrong. The electrode is providing sparks. The pilot burner gas valve is providing gas. The thermo sensor is able to detect the fire once that the main burner is ignited. The only thing that is not happening is the pilot burner flame to ignite in the right place. So, what's next? Any help would be very appreciated. Thanks a lot, regards

Oct 22, 2018 | Water Heaters

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