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The burners won't light up - Rheem GN91-200 Commercial Water Heater

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Posted on Oct 12, 2010

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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

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

Pilot lights but burner won;t ignite.


Problems include: dirty combustion parts, clogged air intake, insufficient air quality, low gas pressure, bad vent, bad gas control valve thermostat.
Excluded are: air in gas line, bad thermocouple, clogged pilot tube, ECO lockout from overheating, FVIR tripped from flammable vapor event.

Open following link for illustrations showing how to clean parts, check vent, plus some reading resources for troubleshooting gas control valve thermostat.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean

Aug 15, 2011 | Whirlpool 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

1 Answer

Pilot light stays lit BUT burner will not light


Sounds like gas control needs replacing. Before you do, Shut gas off at valve and your tanks and take a 3/8 or 7/16 wrench and remove the end of the thermocouple that screws in to gas control. Now spray a shot of WD-40in the hole it came out of. Now take a piece of fine steel wool and twirl it in your fingers until it's a few inches long and small enough round to put down in that hole and spin it with your fingers to clean surface where thermocouple seats, well. Use compressed air and blow it out now. Take a little piece of fine steel wool again and rub end of thermocouple that goes in the hole, so it's nice and shiny and clean. Now re-assemble, snug it up and re-try lighting. If pilot stays on, but burner won't light, and your 100% sure water is not already hot, ( check temperature coming out pressure relief valve, carefully) and temperature lever is over to hot setting, then replace gas control. One good indication of a faulty control is if you move the temperature lever all the way over to coldest and back all the way over to hottest and you don't hear it click.

Jun 12, 2011 | RTO Atwood Water Heater - 6 Gal LP

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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