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Water heater burner won't light - Heating & Cooling

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Generaly three things are the problem, first the easy ones, pilot and or thermo couple, cheaper to replace, and usually fixes the problem. Last would be the gas valve itself. Good luck to you.

Posted on Dec 08, 2008

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Whirlpool/Honeywell hot water heater light flashes 5 then 7 times and won't light. Burner is clean and all contacts are good. Out of warranted.


Copy following link to troubleshoot by type of gas control valve, including directions for cleaning air intake screen, and or replacing gas control valve:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
http://www.thetankatwaterheaterrescue.com/forums/forum3/

7 flashes: Gas control valve might be bad.
4 flashes: FV overheat, clean air intake.
Soot indicates clogged air intake slowed combustion venting possibly causing overheating and lockout. Clean air intake screen located on bottom of unit.

Apr 17, 2013 | Water Heaters

1 Answer

Reliant 501 Natural Gas won't stay lit


Reliance water heater?
Thermocouple is good if the pilot stays lit continuously.

501 is older model. Unknown if this unit has FVIR protection and sealed combustion chamber or open air intake on front of unit.
http://waterheatertimer.org/pdf/Reliance-2006-Service-Handbook.pdf

With FVIR protection:
Get more fresh air to the unit.
Clean the flame arrestor screen.
Test and replace the thermocouple:
http://waterheatertimer.org/How-to-test-water-heater-thermocouple.html
Inspect and clean burner and combustion parts
Test gas pressure, bleed air out of gas line.
Replace gas control valve.
Test draft air by lighting match and see if smoke is pulled into the vent pipe at draft hood on top of tank.

Aug 20, 2012 | Water Heaters

1 Answer

The pilot light went out on my aqua star 125 BNG tankless water heater. I lit the pilot and the burner started and now the burner won't go out it when I turn the water off Serious business anybody got...


Before calling service technician, copy following links for troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Jul 13, 2012 | Water Heaters

1 Answer

Burner won't light, pilot is burning just fine.


Once you get the pilot to light and stay lit did yall move the burner knob to the ON position? Is the temp knob all the way up?

Nov 27, 2011 | Procom Heating & Cooling

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

I have a model 640 Reliance water heater. SN # A07A150454 M,F, 01/30/2007. About 3 months ago the water started getting cooler, then won't start. I turn the control up, then it starts, but the...


I believe 640 is typical tank-type atmospheric-vented gas water heater.
Gas water heater problems can get complicated. New heater sells for $350 at local box store.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

If thermostat is not controlling temperature accurately, then (1) gas control needs replacement (2) water heater has sediment build-up (3) combustion and burner parts need cleaning. (4) All three things above, plus additional causes such as bad venting or not enough combustion air.

Usually recommended that plumber replace gas control valve thermostat:
See typical tank-type thermostats:
http://waterheatertimer.org/images/Typical-gas-valve-500.jpg
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

Clean sediment out of tank:
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

Clean combustion chamber and burner parts and troublehoot venting and air supply:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot
http://waterheatertimer.org/images/Clean-burner-300.jpg
http://waterheatertimer.org/pdf/Bosch_Ventilating_tight_houses.pdf

Aug 07, 2011 | Reliance Water Heaters

1 Answer

I can light the pilot and the burner will come on, but it won't stay lit. I bought a new pilot assembly and installed it. the burner and the pilot light still won't stay lit. This is the unit that...


Most gas water heater problems can be solved by having service technician perform yearly maintenance. Or by doing maintenance yourself.
This maintenance includes cleaning burner parts and combustion chamber, checking gas pressure and supply, bleeding air out of gas line, checking vent draft, making sure air supply is adequate and not exposed to chemicals, cleaning air intake. Also adjusting flame sensor so it is positioned correctly. If water heater is connected to electric circuit, the outlet must have correct polarity.

You can get gas to appliance indicates the gas control valve and water heater are not locked out. But the gas control valve thermostat can still be bad.

Open following link for illustrations, typical service manuals, and maintenance information, and images of gas control valve thermostats.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Jul 20, 2011 | Reliance & Pilot Assembly for Natural Gas...

1 Answer

Pilot will light after 30 seconds when you try to move knob to on position the pilot goes out and heater won't ignite.


You need to replace the thermocouple.
When you light the pilot it is supose to heat the thermocouple.
the thermocouple produces a small electric current which allows the gas valve to open and keep the pilot going. and allowing the main burner to come on.

Jun 21, 2011 | RTO Atwood Water Heater - 6 Gal LP

2 Answers

I turned on hot water to take a bath, and it was hot. by the time the tub had filled the water was freezing. now we cant seem to get hot water out of anywhere. the pilot light is on. the knob is set to on,...


if I was a betting may I would say that this is a small water heater, what is the temperature set on, as the pilot light will be lit once the temperature is reached, but until then the burners will be lit. I would move the temperature knob and listen to see if I hear the burners kick on. Hope this helps Tim

Apr 17, 2011 | Heating & Cooling

1 Answer

The pilot light & will stay lit. untill the burner cycles on/off


MAKE SURE THE BURNER TUBE AND ORIFICES ARE CLEAN. MAKE SURE YOU HAVE THE PROPER LP PRESSURE.

Oct 05, 2009 | RTO Atwood Water Heater - 6 Gal LP

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