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Powerstar 45-551701 gets very hot then cold - Bosch PowerStar AE115 Tankless Water Heater...

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6ya6ya

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Hi there,
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Posted on Jan 02, 2017

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Anonymous

  • 248 Answers

SOURCE: We have no hot water

diaphragm valve or micro switch best of luck

Posted on Nov 06, 2009

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Have the 125. The light comes on on the panel, but water is usually ice cold. Have tried adjusting the thermostat but same results. Open to any suggestions on this matter. Thanks


Any suggestion could include a list of possible problems from bad PC board, burned out element, bad sensor, loose wire, or combination or these.
More information is needed to make a guess.
Test elements for continuity.
Check wires for loose and burned connections.
Open TP valve and test if hot water is available at machine.
If water at TP valve is hot, then problem might be plumbing-related, for example crossover.
http://waterheatertimer.org/Crossover.html

Aug 15, 2011 | PowerStar AE 125 Electric Tankless Water...

2 Answers

I have a Powerstar Electric tankless water heater, 45-551301, installed in a new home less than 3 years ago. We have always had minor problems with the hot water staying hot, fluctuations in hot and tepid...


Tankless heater are a little frustrating sometimes but this is generally an issue of waterflow I believe. The fluctuations are do probably to the amount of water and rate of water going through the heater. If you have a shut off valve on the cold side of the heater, shut it back about half way. This will slow the water going through the heater and allow the heater to heat it up more efficiently. Then go to the shower, turn the hot on all the way (no cold) and allow it to heat up. Once it has heated up, test it by hand for a good temperature that you like. If it is too hot, turn the cold on just a bit until it comes to the temp you like. If it is too cold turn the hot down just a little (still no cold) and it will warm up. Ideally you should be able to turn the hot on full blast and then just turn on a little cold to get the right temp. Once you learn how these work then it makes it easier. You really cant run the water like you do with conventional hot water systems and expect to get the same results. Also, wanted to give you another little tip. Every 6 mos to a year, you should flush you heater with vinegar for about 30-45 minutes using a small cheap submerible pump like for a water feature in a garde. Just put in a bucket of vinegar and and run a hose to the "in" side of the heater and another from the "out' side of the heater and then back into the bucket. This will circulate the vinegar inside the heater and clean all the deposits that will DOA your heater. Funny how the manufacturer wont tell you this but these deposits will ruin the connectiosn on the heating elements. You can make your heater last for a long time if you do this.

Mar 27, 2011 | Bosch PowerStar AE115 Tankless Water...

1 Answer

My Powerstar tankless water heater was installed last April and we have a problem that has become a real issue. We can set the temperature where we want it and get in the shower and the water will go from...


Ok, sounds like a flow sensor issue, is your house water pressure steady or does it fluctuate? The sensors on these seem to be a common issue and this model has many issues with heating. take care

Jan 17, 2011 | Bosch PowerStar AE125 AE125 Whole House...

4 Answers

I have had a PowerStar A125 for about a year and now the water is hot in the beginning and goes cold and then hot again. I have observed the light when the shower is on it cycles on and off. My wife wants...


If on a well, you can install a regulating valve in the line to help with this problem. You may have to play with the valve a little to find the right pressure to avoid those highs and lows. I installed a Bosch A125 and had this problem from the start. A little research un-earthed the regulating valve (I think around $25 at Lowe's or Home Depot) and we have had even hot water ever since.

Jun 15, 2009 | Bosch PowerStar AE125 AE125 Whole House...

2 Answers

Water doesn't stay hot PowerStar AE3.4


Are you using a single lever faucet? The install guide does indicate that you may need to reduce the input from the cold water side to ensure that water stays at a consistent temperature (see page 7 of the installation and service manual). Also, remember, this is a SMALL hot water heater. So if you're running for any length of time at full output, it may not keep up with you (see page 8 of the service an installation manual). I found the manual online at http://www.airwater.biz/images_templ/bosch-water-heaters-ae3.4-manual.pdf.

Jan 24, 2009 | Bosch PowerStar AE3.4 AE3.4 Point-of-Use...

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