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Pilot lights but main burner does not light Bosch 10P LP Gas

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Try by passing thermostat first assuming that it is home heating unit To by pass remove thermostat an connect the red &white togetheir.If main burner lights replace the thermostat. Next step if this fails is to replce the the thermocoupler. This tells the gas regalater that u have apilot.hope this helps let me know.

Posted on Apr 11, 2011

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How to light the Bosch TF250 pilot light


I believe this is a hydro-sparker pilot ignition then burner on when T-Couple/Flame Sensor acknowledges pilot lit.
W/O the signal feedback the Gas Valve will not open and light burner.
This is a Technician Service Job as you have insufficient knowledge to DIY this potentially dangerous LP/NG Control Valve/Sparker Assembly
I assume that lack of knowledge by your lack of a Manual for the Unit
You cannot force ignition on a hydro-sparker manually.

Sep 08, 2014 | Bosch Water Heaters

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I have a Bosch 10P water heater. Pilot light has blown out and while trying to relight the pilot the stop button has been pushed down and won't pop back out. What am i doing wrong? Cheers


What leads you to suspect that pilot blew out instead of another problem?
Fact that pilot will not relight, indicates other factors at play.

Open following link for Bosch troubleshooting resources including manual, and Bosch contact info:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Best place to start is your manual.
http://waterheatertimer.org/pdf/Bosch_10P-installation.pdf

1) Manual recommends 'cleaning by authorized person, never less than once a year.'
Tankless water heaters, and most newer tank-type gas water heaters, are highly technical and finicky devices that require continual maintenance, with tankless requiring 'yearly' maintenance while tank-type require 'periodic' maintenance.
2) Troubleshoot in manual says 'no gas supply' or 'blocked pilot' replace pilot injector

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

May 21, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have a Bosch GWH 425 HN Tankless Hot Water Heater...On 2/28/2010, it began intermittant exploding when demand for hot water occurred. Local technicians worked on the unit several times, changed and...


I have the same problem with the same model. The problem has been identified by a friend of mine, correctly, I think.
This is a very dangerous problem involving Bosch's much touted safety feature, ironically enough. IT IS THE FLAME SENSOR IN THE GAS VALVE. The flame sensor is supposed to confirm that the pilot has lighted BEFORE the main gas line sends gas to the main burners, after which the pilot shuts off. The pilot light is not coming on, the sensor that shouldn't let gas fto the main burners is failing and the main gas is flowing and ignighting from the spark that is supposed to light only the pilot in a big explosion.
This is the 2nd unit of this model that has failed. I think Bosch should do a recall

Apr 25, 2010 | Bosch & Tankless LP Hot Water Heater

2 Answers

Pilot light will not automatically light when hot water is turned on


This is a great unit! Try turning the flow nob to the half way point and the flame all the way to low. Run the hot water tap and slowly turn the flame dial until you hear the unit try to light. Every house is different regarding the restrictions in the plumbing and water pressure. Once the unit tries to light that is your minimum setting. It is best to leave it there.

Apr 05, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

Bosch Aquastar tankless water heater model 1600P Pilot is lit but main burner will not lite. replace water valve that controls ignition.


There should be a thermocoupler, it is that bulb that sits in the pilot flame. If it is not functioning properly the main gas valve will not open.. Hmmm, Is the main valve in the on position?

Oct 10, 2009 | Bosch AquaStar 1600P-LP 1600P Liquid...

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Water wizard 10P pilot light keeps going out


If the thermocoupler is defective the gas to everything is shut off. The coupler is the bulb that sits ib the pilot flame If it doesn't heat up it will sense no pilot and shut the gas off. They don't cost much and are easy to change. Good Luck, Ned

Sep 17, 2009 | Bosch & Tankless LP Hot Water Heater

2 Answers

My bosh water wizard 10P pilot light keeps going out.


Very possible the thermocoupler is no good. The thermo coupler is that bulb that is in the pilot flame. It controls the main valve It's not expensive and fairly easy to change out.. Make sure you get no dirt in the cspillary tube hole.brass screw end. The bulb must be just in the flame tip when adjusting. Good Luck, Ned-

Sep 17, 2009 | Bosch & Tankless LP Hot Water Heater

1 Answer

I can not get the unit to light.


Make sure the window is big enough. Ok, not funny. Turn the gas on and leave set for 24 hours Light the pilot light and make sure the thermocoupler is at the tip of the flame. hold pilot until the coupler bulb is nice and hot , release the pilot button nice and slow. If the pilot goes out, The thermocoupler is defective. If this sneaking up on it works, then fire up the main burner. Letting the unit sit under the gas pressure for24allows a thorough purging of the main valve. and saturation of any air pockets. Lighting one in cool temperatures is somtimes difficult becase the gas is heavier or more dense than under warm conditions. Sounds dumb, I know. But give it a try and let me know how it goes.Good Luck, Ned

Aug 27, 2009 | Bosch AquaStar 1600P-LP 1600P Liquid...

1 Answer

I don't know how to restart my old bosch water wizard 10p, pilot light has gone out.


get a long stick match, a flashlight remove lower inspection cover, find thermocouple and pilot light will be next to it,turn gas valve to pilot light and hold down,stick the match in by thermocouple till the pilot lights and hold valve down till pilot stays lit,this may take a minute or more,then release gas valve and see if pilot stays lit, if not retry,if it wont stay lit,the thermocouple is defective and needs replacement

Jul 12, 2009 | Bosch & Tankless LP Hot Water Heater

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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