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Bosch AQ125BNG Burner goes out even though the

Bosch AQ125BNG Burner goes out even though the hot water valve is open. Starts OK and after a few minutes the burner goes out and the pilot light is still on. Have to shut off the hot water valve wait a minute and turn it back on. Hot water starts and after a few minutes goes out again.

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Often, this is the result of a restriction of exhaust gases. This type of hot water heater must be adequately vented, (per installation specs). I found this out after taking a number of cold showers. :^( Two years later, and still counting, no more problems. :^)

Posted on Dec 06, 2009

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Posted on Jan 02, 2017

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3 Answers

Bosch aquastar Aq125-hx does not produce hot water. Pilot is ok. Gas and Flame heat is ok. water pressure is ok. Just no hot water getting to the faucets. Help.


That particular tankless water heater has hydro-generated ignition. In order for it to function, it requires a certain water pressure and velocity. You can try turning on the hot water in two location in your house to see if that gets it started. If it does, try getting a higher flow shower head, or removing the limiters in your faucets.

Jan 07, 2011 | Bosch AquaStar Indoor Natural Gas Tankless...

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Hi, first of all, HAPPY HOLIDAYS! now...I was given a Bosch AQ125BNG in need of some repair but I want to convert it to LPG gas, can this be done? I am having a heck of a time even locating the LPG valve...


Happy Holidays to you too.
You will also need to change the
Burner
Nozzle
Pilot injector and the
Gas regulator in order for the unit to function properly. You might try running a ad on CraigsList. If you cannot find one for free, you may end up spending more money then the unit is worth. You could also put the word out with local plumbing companies that replace these heaters to look out for a used one. Some one out there has to have one those laying around.

Dec 19, 2010 | Bosch & Tankless LP Hot Water Heater

2 Answers

Burners will not disengage after shutting off Hot Water.


Ok the way this system works is from a pressure and flow switch. The pressure switch picks up the slight drop in pressure when the hot side water is turned on then turns on the burner. The flow switch measures the amount of water flowing and adjusts the size of the burner to the amount of water flow. So a couple different things might be happening. The flow switch might be sticking causing the water heater to throttle down the burner but not off when the water flow is off. Or the gas control valve might be by-passing gas when off causing the burner to stay on even when the demand is off. Run the hot water on high demand then turn the water off. If the burner is still on try banging on the water heater with your hand and see if the burner shuts off completely. If it does the gas control valve might be by-passing. You would also need to check and see if the pressure/flow switch is giving any voltage signal changes when the water flow is off. These tankless water heaters are more comlplicated to work on than a standard water heater and you may need a professional's help...good luck

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A trickle of hot water from taps, central heating ok


it sounds like your shut off valve might be bad even though it turns on and off by turing it doesn't mean that the washer is not stuck to the seat and not opening, try replacing the valve

May 18, 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

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Flames coming out of the air inlet duct


sounds like you need to clean the burner. Do that if still having the same problem ,then the gas valve would next.Because it sticking.

Mar 14, 2009 | Bosch & Tankless LP Hot Water Heater

1 Answer

My water valve is leaking on the AQ125BNG does anybody know what the model number is for the water valve?


if it is leaking behind the handle take the nut off remove the handle and tighten the packing replace the knob and your done,, good luck

Feb 27, 2009 | Bosch AquaStar Indoor Natural Gas Tankless...

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Bosch AQ125BNG gas water heater


First thing I would do is clean and rebuild the watervalve. The watervalve on this heater mandates everything. This watervalve has a maintenance schedule in the manual. She be rebuilt every 3 years. Also sounds like the diaphram in the watervalve may be damaged.

Dec 13, 2008 | Bosch AquaStar Indoor Natural Gas Tankless...

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