Stiebel Eltron tankless heater Tempra Plus 36 issue

[TravisOKC]

I have a tankless electric Stiebel Eltron Tempra Plus 36. It is probably 7 years old and have worked perfectly until yesterday afternoon. The unit had no power. The temp display was not lit up. I checked the circuit breaker and it had not been tripped. I did notice the pressure reset switch on one of the tanks, right side one, needed to be reset. When I pressed it the system powers up and produces hot water. The shower was able to be used for a normal shower, 10 minutes or so. The issue is that once the water is not in use the system shuts down after a few minutes of non use. I can keep resetting the thermal cut out but it just trips the reset again. I have taken out the flow sensor and it seem to be fine, I also looked at the screen on the inlet and there is no build up. I called a plumber and told him my issue he said he didnt work on these units and would just sell me a new system.

Is it possible or probable that all I need is a new safety thermal cut out for the one that keeps resetting?

any help is appreciated!

Thanks, Travis

 

[GReynolds929]

You could have an element failing and overheating the water.

 

[Sponsor]

 

[Fitter30]

Have u ever cleaned it with vinegar and a pump? Yearly? Looked a couple of install manuals none of installation manuals don't write anything about mineral built up except in faucets. Heater is full minerals encapsulating the elements. Look at youtube cleaning a combi boiler.

 

[jsonaudio]

I have a tankless electric Stiebel Eltron Tempra Plus 36. It is probably 7 years old and have worked perfectly until yesterday afternoon. The unit had no power. The temp display was not lit up. I checked the circuit breaker and it had not been tripped. I did notice the pressure reset switch on one of the tanks, right side one, needed to be reset. When I pressed it the system powers up and produces hot water. The shower was able to be used for a normal shower, 10 minutes or so. The issue is that once the water is not in use the system shuts down after a few minutes of non use. I can keep resetting the thermal cut out but it just trips the reset again. I have taken out the flow sensor and it seem to be fine, I also looked at the screen on the inlet and there is no build up. I called a plumber and told him my issue he said he didnt work on these units and would just sell me a new system.

Is it possible or probable that all I need is a new safety thermal cut out for the one that keeps resetting?

any help is appreciated!

Thanks, Travis

Travis, did you ever figure out how to fix this issue? Mine just started doing this 2 days ago and I am trying to fix it. Thanks for any help or advice you or anyone can give me

Thanks, Jason

 

[Fitter30]

If you haven't run vinegar through it and its been over a year. Look on tou tube to see what you need and how to do it.

 

[jsonaudio]

Ok, I just ran vinegar through it for 3 hours. The vinegar did get brown and dirty with sediment. I replaced the flow sensor also, and I am still having the same problem.

 

[Fitter30]

Limit switch trips at 185° f did u happen to run it in both directions?

Ok, I just ran vinegar through it for 3 hours. The vinegar did get brown and dirty with sediment. I replaced the flow sensor also, and I am still having the same problem.

 

[Ivan]

Did you ever found the problem, mine just started doing the same exact thing. No clue what the issue is…

 

[Ivan]

Hey Travis did you ever figure out the problem?

 

[Fitter30]

Hey Travis did you ever figure out the problem?

First need the lowest water temp incoming ? Then outgoing water temp? Then measure water flow out the bathtub filling a 5 gallon bucket for 30 seconds full hot. Double water flow look at chart. 1st page don't use a ir thermometer use one with a probe. Have you cleaned it with vinegar? Both directions? That colored water is chemicals in suspension. If water is dark dump it put fresh vinegar in. Clamp on amp meter ( $25)to check each element

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[Ivan]

I have a tankless electric Stiebel Eltron Tempra Plus 36. It is probably 7 years old and have worked perfectly until yesterday afternoon. The unit had no power. The temp display was not lit up. I checked the circuit breaker and it had not been tripped. I did notice the pressure reset switch on one of the tanks, right side one, needed to be reset. When I pressed it the system powers up and produces hot water. The shower was able to be used for a normal shower, 10 minutes or so. The issue is that once the water is not in use the system shuts down after a few minutes of non use. I can keep resetting the thermal cut out but it just trips the reset again. I have taken out the flow sensor and it seem to be fine, I also looked at the screen on the inlet and there is no build up. I called a plumber and told him my issue he said he didnt work on these units and would just sell me a new system.

Is it possible or probable that all I need is a new safety thermal cut out for the one that keeps resetting?

any help is appreciated!

Thanks, Travis

Did you ever figure out the issue?