Question about Bosch AquaStar Indoor Natural Gas Tankless Water Heater with Vent Hood #125

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Pilot light will not stay on - Bosch AquaStar Indoor Natural Gas Tankless Water Heater with Vent Hood #125

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The thermocouple lead needs to be replaced this is the copper tubing that runs from the pilot to the control it is about 5mm in diameter and costs about $80 at any pumbing supplies

Posted on Jul 12, 2010

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1 Answer

Pilot light doesn't stay lit


The thermocouple may have failed. It looks like a copper wire that goes from the gas valve and leads to the pilot light.My first thought is that the pilot light burner is not burning hot enough because its got dust in it or a spider web blocking some of the air it needs to burn hot. If the pilot stays on long enough to bring the main burner on, a dirty main burner lighting rough will cause the pilot to snuff out. To do the actual repair I would suggest that you contact the manufacturer on the internet. Getting up to your elbows in a gas appliance without professional help is asking for dangerous serious trouble. Good luck.

Aug 17, 2013 | Honeywell Water Heaters

1 Answer

The pilot won't stay lit on gas hot water tank.


Make sure thermocouple tip is seated inside the burner flame.
Make sure thermocouple is not overtightened. Finger-tight + 1/4 turn.
If the pilot lights, then ECO energy cut off is not tripped, but gas control valve might be bad.
Check color of pilot flame: it should be strong and clear blue.
If pilot flame is weak, or color of flame is yellow-orange: Clean pilot orifice and burner and combustion parts on yearly basis.
Clean air intake screen if applicable.
Increase air supply to water heater. Open a window and see what happens.
Check for adequate draft going up chimney using match under vent hood to see if smoke drafts immediately upwards.
Bleed air out of gas line.
Check gas pressure.

Open following links for troubleshoot resources:
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
http://waterheatertimer.org/pdf/Pilot-outage-troubleshooting.pdf
http://waterheatertimer.org/pdf/Vent-spillage-test-atmospheric-gas-water-heater.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Sep 21, 2011 | Water Heaters

1 Answer

Lowe's hot water heater pilot light will not stay


Hi,

If it is one of the new ones with the fancy gas control and the blinking light... does the light blink?? or not??
If it is blinking then the pilot should stay lit...
If it will not blink then the sensor is bad or not in the right place...

Or... the gas control is bad... this is happening alot...

If it is brand new... take it back...

heatman101

Sep 05, 2011 | Whirlpool Water Heaters

2 Answers

Pilot light will not stay lit.


More than likely the thermal couple is defective. The thermal couple is a safety device that shuts the gas off if the pilot goes out. If it is defective the pilot light will not stay lit. The thermal couple is the device that the small copper line goes to. It is mounted beside the pilot flame and the flame much touch the TC for it to work. If the flame is not touching the TC bend it until it is in the flame. If it is touching the TC then replace it.

Jul 28, 2011 | Whirlpool Water Heaters

1 Answer

The water heater pilot does not stay on?


The pilot light on hot water heaters is controlled by a thermocouple, a small copper rod that usually sits in or very close to the pilot light flame. When they go bad, which is not unusual, they do not allow the gas line to stay open and feed the pilot light. The easiest thing for you to do would be to replace the thermocouple. When following the pilot light lighting instructions, be sure to hold the valve button down for 30-45 seconds in order for the pilot light to heat the thermocouple prior to turning on the gas burner.

Sep 11, 2010 | Reliance Water Heaters

1 Answer

Pilot light will not stay on Bosch natural gas tankless water hea


Check to make sure the flame of the pilot is hitting the thermocoupling. If not then you can use compressed air to clean the pilot port and relight and check again. If the flame is hitting the thermocouple, then it may need to be replaced.

May 05, 2010 | Bosch AquaStar Indoor Natural Gas Tankless...

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

Pilot Light problem


By controler I am guessing you mean gas valve? The next step, and I am not sure the water heater age rates this ,is to replace the gas valve. 

Mar 13, 2009 | Water Heaters

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