Question about Bosch & Tankless LP Hot Water Heater

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No heat, no light, has flow and power?

No heat, no light, has flow and power. Bosch powerstar model 45-551301. looks like the ae125? 3 40 amp circuits. white button on top of heating units (thermostat reset?) doesn't seem to do anything. was working with occasional drop in temp like one unit would go out, but now nothing. the lights don't dim when the water is turned on so the units aren't drawing although I can find power with a meter.

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I'm experiencing the samething it's been installed 3 years and christmas day nothing. Please help.

Posted on Dec 26, 2010

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1 Answer

Unit will not turn off


If your light stays on after water is shut off, your flow switch is sticking. YOu need to replace the flow switch. If your light shuts off, but the unit continues to heat and trips your tco, then your element is bad and the unit needs replacing.

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How do I test the heating elements on Bosch Powerstar AE125 with multimeter


Product manual shows electro-mechanical thermal cutout page 9 but offers no troubleshoot steps except to say that overheating is cause.
http://waterheatertimer.org/pdf/Bosch-AE115-AE125_manual.pdf

http://www.bosch-climate.us/files/201009211859150.EP-23_Removing_and_replacing_element_assembly.pdf

Test elements:
Remove both wires off element.
Set multimeter to read ohms.
Watt and volt rating appear on side of each element.
Ohm = Volts squared divided by wattage.
For example:
Assume 240Volt circuit (240 Volts squared = 57600)
Assume 9000 watt element > check side of element for rating.
So 57600 divided by 9000 watt element = 6.4 ohms
http://waterheatertimer.org/images/ohm-reading-for-emements.jpg

Have you de-limed this unit?
Is there a check valve causing closed system in the plumbing, that might also cause decreased water flow?
Are there reduced-flow faucets or clogged aerators?
What happens when suspect cut-out element is no longer connected? The unit should continue heating.

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1 Answer

Bosch AE-9.5 keeps tripping the reset


All resets and breakers trip with high heat.
Do you mean the tankless unit is tripping the 40 amp circuit breaker?
Or the thermal cut-out, located on unit, is tripping?

Is this a new installation?
Or was the tankless working before and stop working?

Copy following link to check wiring.
AE 9.5 requires 40 amp breaker and 6 gauge wire.
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

If the unit is tripping the thermal cut, -out, then product manual says to call Bosch or service technician.
Call Bosch 866-330-2729
http://waterheatertimer.org/pdf/Bosch-Powerstar-AE3.4-7.2-9.5.pdf
Thermal cut-out can trip if water flow is too low.
Try changing power selector screw from Hi to Lo so only 1 element is ON. See diagram page 6 of manual.
Adjust the 'outlet service valve:' The manual recommends that a ball valve be installed between hot outlet and faucet. Adjust the valve so more water flows to faucet.
Remove aerator, clean aerator, don't use low flow restrictions or low flow shower heads, replace leaky faucet cartridge on single-handle faucet.

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1 Answer

Tankless electric water heater not heating


If you smell it - look fer it. It may be a bad connection on the AC supply line all the way back to the service panel or inside the heater connection panel. Bad connections cause high heat and discoloration of wires or connectors and a serious voltage drop to the appliance.

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1 Answer

Electric bill doubled last month, and we've had the Powerstar AE125 tankless electric for over a year. There are no leaky faucets.


There are a lot of other things that eat electricity. Like space heater and using ovens for heat. Heat pump.Central heat fan running all the time. House lights left on. Outside flood lights. Clothes washer using HOT water. Look around real good. It all adds up. Also the power co. may be charging more for "fuel" costs surcharges. Here in GA I'm paying a bit more now to pay for a nuclear power plant.

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I don't have specific suggestion for tankless tripping breaker or if that is a circuit breaker problem or a tankless problem.

1) Move wires to another same-size breaker and see if problem persists.

2) Compare amp draw on tankless label with wire size and breaker size amp rating.
For example 30 amp breaker using 10ga wire is rated for 80% of listed amps or 24 amps.

3) If you are drawing full 30 amps, then 30 amp breaker is getting hot. Breaker trips with heat. Older breakers can trip more easily.
http://waterheatertimer.org/How-to-replace-circuit-breaker.html

4) Before calling service technician, open following link for Bosch troubleshooting steps.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

5) Be sure to read manual for yearly maintenance requirements.

6) Add a tempering tank for incoming cold water problem.
http://waterheatertimer.org/Tempering-tank.html

7) All gas tankless brands can be repaired by homeowner for $330.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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Not sure if my first try worked so will try again. Bosch PowerStar AE125 Tankless Water Heater. Quit heating water. Water pressure and flow is good. Thermal Cut-outs are good - (not tripped) (Power at...


The easiest thing to do would be to call Bosch and just ask for a new heater for free. The other option is to call Bosch and have them send you all new elements. If there is power, there should be heat of some kind.

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Our PowerStar PS19T tankless water heater


The PowerStar AE115 unit replaces the PS19T model which has been discontinued. Now's the time to upgrade...

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turn the temp to it;s lowest setting and isolate it from the other unit till it fires up, let me know if this doesn't work,, gary1121@ao.com

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