Question about Bosch & Tankless LP Hot Water Heater

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Hi, I need to replace the thermal coupler on my Bosch waterless hot water heater. Where can I get one and how much

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1 Answer

Pilot goes out might stay on for a week or a minute


pilot fault not giving enough power to thermal couple or replace thermal couple

Apr 20, 2014 | Bosch & Tankless LP Hot Water Heater

1 Answer

Have a Baxi solo boiler 340PF, have hot water but no heating, pilot light will not stay on. how do I fix it so I get heating please?


it might be the thermal coupler....it is a piece of wire that goes from the pilot to the thermostat. very inexpensive. .I am a 50 yr old woman, and I changed mine on my furnace twice..Home Depot or equivalent should be able to help. Google "thermal coupler"

Jan 22, 2013 | Water Heaters

1 Answer

The thermal cutout pops on tank two after it shuts off. It boils then shuts off. It also turns off when taking a shower, producing cold water. I checked the ohm readings on the thermal cutout and the...


Question posted under Bosch tankless.
Question says 'tank'
Brand, model, and type heater unknown.
Elements mean electric.
'Thermal cutout pops when taking shower produces cold water' indicates tankless, since tank-type would maintain some hot water.
No error code might indicate tank-type.
Add a comment with type, brand and model number of heater for possible assistance.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Sep 24, 2012 | Bosch PowerStar AE125 AE125 Whole House...

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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.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Aug 29, 2012 | Bosch AE-9.5 PowerStar 1.5 GPM...

2 Answers

Hi there, I have a bosch aquastar 125b waterless tank. My problem is that i am not getting hot water at all. The water runs during the shower and it stays warm. HELP!!


This should run two showers at once with no problem. If you have a shut off valve on the cold side of the heater, try closing about halfway. This will slow the water flow and the water will have more time to heat up as it pases through the tank. If you dont have a shut off valve, just cut back the hot water valve on your shower and do not use any cold water. If it gets too hot then turn on a little cold water. The object is to slow the speed of the water going through the tank. Tankless heater take a little getting use to but they work great when you know how to treat them. On my shower I turn the hot all the way on until it gets hot and then add a little cold water to bring the temp down. You may have too much water going through too fast to be able to heat it up to what you need. Try this and see how it works.

Mar 26, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

My hot water tanks pilot light turns off after I have relit it. It stayed on while heating the water in the tank and once it stopped heating the pilot light went out again. What would be causing my...


are you holding button down long enough for thermal coupler to warm up? after pilot lights up, don't immediately let go of button for about 15 to 20 seconds then let go and pilot should stay on. If not, you may need a new thermal coupler for that water heater

Jul 03, 2009 | Water Heaters

1 Answer

No hot water, pilot light lights but no burner ignition


Thermo coupler may be defective. it controls the main gas valve by closing main if pilot is out. make sure thermo coupler bulb is positioned over and near tip of pilot flame, but not in the flame. Thermo couplers are inexpensive and easy to change out.

May 05, 2009 | Bosch & Tankless LP Hot Water Heater

2 Answers

Bosch PowerStar125 won't heat and I can't get one element to work


It sounds like you have a copper canister unit. Ohm out the elements in that one canister. the directions are on the websight for bosch, or I can walk you through it. But you will need a digital multimeter to do this. If you have a blown element in that one canister, then the tco will not reset.

Jan 01, 2009 | Bosch PowerStar AE125 AE125 Whole House...

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