Question about Reliance & LP Gas Water Heater Control

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Model 640HORT Reliance 606 40 gal LPgas came to cabin, water cold, lit; ran for 4 hours, flame went out, burner won't come on.

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It does sound like a weak pilot thermocouple. Change the thermocouple first. Make sure you have an adequate supply of propane serving the water heater. If it still works for a while then completely shuts down, you will need to replace the control valve. Call Reliance and see if the unit is still under warranty, you may be able to get free parts.

Posted on Sep 11, 2010

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New Reliance gas water heater won't stay lit


There is a sensor that shuts off the gas to the burner if a flame isn't detected within a few seconds. It will usually look like a tube that extends into flame of the burner. It may be defective or it may just need to be repositioned so more of it is directly in the flame.

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I have a 640dors reliance capacity40 water won't stay hot long(electric)


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Rheem Fury Gardian 40 gal LP water heater pilot will not stay lit


1) Clean air intake (flame arrestor):located under combustion parts and look for broken glass from TRD
http://waterheatertimer.org/How-to-repair-Rheem-TRD.html

2) Troubleshoot by type of gas control, and link to AS Smith service manuals
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

3) Add a comment with more information
http://www.thetankatwaterheaterrescue.com/forums/forum3/

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My hot water heater won,t stay lit


Question posted under Reliance tank-type gas water heater.
Look at label on side of unit and add comment with brand, model and type heater, because the answer depends on which brand and type water heater you have.
Information below is for Reliance tank-type.

First of all, you need to clean the air intake located on bottom of unit.
The fact that the pilot will light indicates that you are getting gas, but the gas control might be bad, or the unit suffered FV failure from overheated combustion chamber and might require part replacement.
To get a good gauge of situation, clean the air intake first, and then add a comment.
Look at image for inspecting air intake.
Then use feather duster and/or compressed air to clean flame trap, arrestor screen (air intake)
http://waterheatertimer.org/images/Flame-trap-inspection.jpg

ADD A COMMENT with more detail.
Additional resources:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
http://waterheatertimer.org/How-to-replace-thermocouple.html

Sep 26, 2012 | Reliance & 30 Gal LP Gas Water Heater

1 Answer

I have a Reliance gas 501 water heater model #5 40 PORT980. Yesterday, we had no warm water. I looked and the pilot lit was lit. I turned the temperature knob to very not and it lit the


Reliance
2nd and 3rd digit of serial number is year
C05 is 2005

What color is flame? Should be clear blue.
Pilot is burning so thermocouple is good, and sitting in pilot flame.
Pilot flame should be clear blue.
Otherwise clean burner parts.

Is water at tank hot??
If burner is not turning on, the gas control thermostat is probably bad.
http://waterheatertimer.org/pdf/How-to-replace-water-heater-gas-valve.pdf

Otherwise more information is needed.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

Sep 19, 2012 | Reliance 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.

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Rheem 22V50F1 pilot won't stay lit. Changed thermo couple & it lit, ran then went out. Let it sit overnight & it lit, ran then went out. What next? p.s. The unit is 5 years old. Thanks


If pilot lights and flame is robust and clear blue, and pilot goes out later, then some suspects can be excluded: air in gas line, low gas pressure, thermocouple is overtightened (finger-tight + 1/4 turn), thermocouple not positioned correctly in the flame, dirty pilot tube.
If flame is yellowish and small: then clean pilot tube and combustion parts.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean
Remaining suspects can include: air in gas line, low gas pressure, bad gas control valve, tight house so household vent fans pull air down water heater vent that blows out pilot, hot attic with inadequate ventilation, water dripping down vent.

Open following links to read troubleshoot resources.
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Aug 16, 2011 | Rheem 50 Gallon FVR NATGAS Water Heater...

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...

2 Answers

I have a Reliance water heater - 40 gal Model


In my first 15 years as a plumber I never saw a pilot light issue on a gas WH that a new thermocouple didn't fix. Since the government mandated a redesign of the fire box, I've seen three that nothing ever fixed - two Whirlpools and one (my usually ultrareliable) AO Smith - including replacing the entire burner assembly and the regulator. And I've heard of many others.

Check the thermocouple connection for tight. (Don't strip.. threaded soft metals.)
Check the microvents on the bottom ? of the burn box for dust, even if it is new.
Call Reliant and demand new units until you get one that works.
Try another model. Consider a 52gal electric.

I've always recommended gas over electric, and AO Smith and Rheem were my recommendations (and "Reliants" were "lumber yard" water heaters. Sorry.)

Since the mandated redesigns, I don't really have a "proven reliable" model to suggest. I increasingly believe the restricted air flow design is the ultimate culprit, including any changes to the thermocouple/regulator construct to accommodate the restricted air flow design. Just my hunch.

Offered for what its worth. -- plumber in Indiana.

Jan 10, 2011 | Reliance Natural Gas Water Heater Control

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