Question about Bosch PowerStar AE125 AE125 Whole House Electric Tankless Water Heater...

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Electric Bosch tankless water heater wont heat water.

My father installed a bosch tankless heater in their new house (which is actually a very old house). The furnace was an old coal furnace so he took that out & replaced the heat with electric ductless & some baseboards. Obviously he had alot of rewiring to do & replaced the breaker box with a bigger one, knowing he would also be installing the tankless heater. It was installed in 2006 & worked up until October of 2008. Unfortunately my father passed away in August of 2008 & took alll of his handy man skills with him. My mother is left with no hot water for 4 months now. Calling warrenty was about as pointless as this non working tank as us surviving members of the family are clueless on this. There is only 1 service tech certified to service these tanks in our area (Sugar Notch, Pa) but the cost is just rediculous to have him just step foot in my mothers house.
Heres the run down..... you get VERY luke warm water out of the facets. The red light is on on the box. My mother said it was leaking in the past but my dad did fix it before he passed.
Non of us are fix-it-yourselfers so any suggestions or troubleshooting help would be greatly appreciated!

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Here is the run down>
Water too cold Neon light on:
Cause:
1). Water flow is too high-adjusting the water flow as follow; open fully both inlet and outlet shut-off valves at the heater, then turn on fully the highest flowing hot water faucet closest to the outlet connection. Adjust the outlet shut-off valve until the water flow from the hot faucet corresponds to the approximately 3.6gal/min at 105 degree.
2). One of the power supplies is not on-check the breaker box, there should be three ganged breaker, each corresponds to each of the heater power supply.
3). The power supply voltage has dropped-reset the breaker in the breaker box.
4). Temperature dial is turned too low- temperature adjustment is made using the dial on the bottom edge of the unit. The adjustment is between approximately 95 and 135 degree F. Turning the dial clockwise increase the temperature settings.
5). The inlet water temperature has dropped-readjust the temperature dial.

Attached link is for Bosch hotwater heater installation. This should give you idea as to what to look for.
http://www.boschhotwater.com/Portals/7/TechManuals/AE115_AE125_English.pdf
The following link is Basch Hotwater troubleshooting Q&A, this should also give you some help.
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/PowerStarModels/AE115AE125/Troubleshoot/tabid/632/Default.aspx

Please post back on this thread, If you still having problem.

Posted on Jan 27, 2009

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1 Answer

Leaking tank


Replace heater?
Do not install tankless.
Call for service?
Manual does not show troubleshoot or repairs
Bosch site does not show the AE125 series water heater any longer
http://waterheatertimer.org/pdf/Bosch-AE115-AE125_manual.pdf

Gene

Oct 19, 2014 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

There is power to the system but when you turn water on elements do not come one and heat water. all phases have 238 volts to them. why will system not turn on and heat water


Do you have 3-phase water heater? Is this balanced or unbalanced 3-phase unit. Add comment and describe product in detail, including brand since i have some service resources for both types.
Or do you have ordinary residential split-phase 240Volt Bosch tankless computer that heats water, and has 2 or 3 separate elements, and a separate circuit breaker supplying power to each element? And testing across both hot leads coming from each breaker yields 238Volt?
Copy following link for Bosch tankless manuals, with brief troubleshoot section that does not provide detailed service procedures for repairing tankless computer:
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html#manual
If this is new water heater, then call installer. If you installed yourself, then remove tankless and return to seller for refund.
Tankless computers require certain amount of water flow to activate computer sensors. Turn on Hot tap and listen to pipe to hear if water if flowing through hot pipe. Check for crossover:
http://waterheatertimer.org/Crossover.html
Clean water filter usually located just above where cold water connects to unit.
Delime tankless ... and use water softener. Tankless cannot be exposed to more than 11 grains hardness in water, or parts will fail within 2-3 years. Simply deliming tankless heat exchanger each year will not maintain full efficiency... although for typical family of 4, tankless comper water heater costs $100 more to operate than tank-type heater according to manufacturer's promo literature and independent studies.
Call local technician who specializes in fixing tankless computers. For plumbing problems call local plumber. These are two different things.
If tankless computer is older, then cut losses, and buy tank-type electric water heater at Lowes for $285 and make quick changeover and have hot water same day. Sell old tankless on ebay and cheat next guy, or sell at scrapyard for $3 per 100.
Gene
h

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I have a PowerStar tankless electric water heater, model #44-557710 and it was replaced about 3 months ago. This morning I had hot water and this afternoon I do not. When I call for hot water a red light...


Call Bosch. And exercise your 10 year parts warranty rights.
Copy following link for Bosch power star manuals:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html#Ariston
Check circuit breakers, fully off and then fully back on. Test if voltage is at least 80% rating plate on unit. Check that temperature dial is set correctly. Call for service again.
Don't install tankless computer that heats water. You cannot fix this computer yourself, and they are problematic for owners.
Go to Lowes right now, spend $285 and buy tank-type electric water heater, roll it into your house, and save money, since the electric tankless computer heater costs average $100 more per year to operate than tank-type heater for average family of 4.
Tank type heater can be repaired by homeowner same day for $25 using off-the-shelf parts from hardware store. And that empowers the regular guy, and gets you off the junk tankless treadmill.
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Contact Bosch 800-283-3787, or service technician.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Product has 10 year limited warranty against defects in workmanship, failed parts, failed heat exchanger for original homeowner with receipt. But does not cover neglect, failure to follow maintenance, installation etc. Pg 23 example manual
You generally have to pay for service call to verify installation, then send tankless into factory, or have service technician repair unit, at your expense minus cost of parts
http://waterheatertimer.org/pdf/Bosch-AE115-AE125_manual.pdf

To double check wiring:
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

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