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Cozy wall heater working intemittently

One night our cozy wall furnace (w355f) stopped working. Being a guy, I tapped on the gas valve (not the shut off valve) and the heater started working again. Problem repeated so I replaced the gas valve. worked fine for a while (days) then problem repeated. Replaced the pilot generator (even though no problem with pilot staying lit). Same thing -- Worked for a while tapping the valve got it working then it stopped again. But then the burner started cutting out. When it came on, it would stay on for 3-4 seconds then off. Not being too many more parts to replace, I replaced the thermostat. Initially it would cycle fine as the t'stat was adjusted. Now, we're back to the intermittant working and the burner cutting out......HELP!!!!! I'm thinking the only piece left to replace is the burner assembly otherwise one of the new parts are bad

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  • ro2629 Feb 21, 2009

    I have a Cozy wall heater also, replaced thermastat with new white rogers only to find out that thermastat isn't the problem..Cost $200.00. Tech had to come out again, this time states that it is the gas valve that needs to be replaced, low flame,,,cost an additonal $174.00 . Could this truly be the problem or I'm I just getting ripped off? Yes, I am a woman and trying to find an answer and someone honest to deal wiith.



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  • 54 Answers

Sounds like a limit switch is tripping.
This appliance is equipped with a manual reset blocked
flue switch designed to protect against a blocked flue condition,
which would cause combustion products to spill back into the
living quarters. NOTE: A partially blocked, inadequate, or
disconnected vent system may not activate the switch.
Discoloration of the grille is an indication of a bad vent. If this
occurs, the vent can be checked by a qualified serviceman using
a draft gauge. After 15 minutes the gauge should read between
-.02 up to -.04 inches w.c. Vent must be checked at the
beginning of each heating season.

Posted on Jan 28, 2009


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1 Answer

Help! I have a cozy wall heater model W355F-D. I have never ever lit a pilot light in my life and honestly, Im a little nervous. Can you maybe help me and walk me through it?

You should have control knob on the gas valve that has off, pilot and on , turn knob to pilot and hold in you should have igniter button press this in and it will spark at the pilot you may have to press this a few time to get pilot to light . when pilot is alight still hold knob in for 30 seconds then turn to the on position .

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Pretty much the only thing that will do that is the thermocouple not generating enough voltage for the valve to say it's OK.
Usually you need to hold the button for pilot lighting for 60 seconds. You can use a meter to check that it's generating enough power. The thermocouple has to be in the pilot flame properly.

Check this video:

Gas furnace will not light Thermocouple test with the multimeter

Or see this site:
How to Test Thermocouple with Multi Meter Heating and Cooling

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It's possible that tapping the valve may be just enough to make the cylinder inside the valve move. Gas is impure and causes a sticky residue that causes valves to stick. If you are sure you MV is correct and that you have no loose connections, it may be the valve itself.

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This is a weird one, but make sure all the wire connections are in the correct place. I accidentally miss wired a heater like this and it did the same thing.

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