Question about Cozy (W352E) Heater

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Cozy wall heater does not turn on

Gas company said possibly a bad thermostat/ignition?

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  • pops99 Dec 10, 2008

    Will not turn on if room temp is below approx 60 deg F.
    have replaced thermostat 4x.
    Replaced Wire from thermostat to heater with 18ga "thermostat" wire. (approx 35' run).
    Any ideas appreciated.
    Dwight
    pops99@dslextreme.com


  • DonBow11 Feb 06, 2009

    My Cozy wall heater is about 5 years old and has begun to act up. When the thermostat is set at 60 or 80 for that matter, the heater wont light. The pilot is lite but it won't light off the heater. I have found that if I give the gas mechanism a few taps with a screw driver it will light off but will not do it on it's own. If it needs cleaning, how and what do you clean?

  • msgshtgn May 11, 2010

    The most you should run on a milivolt system is about 20 feet anymore than that the line loss of the milivolt system would be extreme.. check the milivolt reading at the unit and then at the thermostat... if you have more than a 200 milivolt drop accross the thermostat the thermostat must be placed closer to the unit... the gas valve requires at leat 200 milivolts to operate at a normal rate.. your thermoplie only prduces 500 milivolts.... on a good clean pilot as it gets older it produces less.. so if you have a long run of wire... also make sure you are using milivolt thermostat.. no heat inticipator.... it will say milivolt right on the package

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Hi, I will walk you through to check the stat. Pull off the cover 1st. You will need a screwdriver, a small one. Could be slotted or phillips. Loosen all of the screws you can see until the t-stat comes off. You have 3 sections counting cover. You will now see the sub-base and wires. You should have only 2 wires to the stat. You will need a piece of scrap insulated wire, even a piece of old speaker wire twisted togeter at each end will work. No worry of shock. Just jump or touch across the 2 terminals and hold them on and if it fires up and comes on, the thermostat is the fault. More then likely that will be the problem. Any hardware store will have one. Get a heat milivolt only, even if the salesman trys to sale you a heat/cool 24 volt stat which will work, but will cause problems in the future. I am sure it is stat. If not, contact me and I will walk you through what else would cause this. If the pilot is on, there is no ignitor on this furnace, either a thermopile generator or a thermocouple, a high limit switch and the main gas valve. Keep me posted, it will only take you a few minutes to test the t-stat. Let me know.
Shastalaker7

Posted on Dec 18, 2009

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It sounds like your problem is delayed ignition.

This can be caused by low pilot flame height (Clean the pilot orifice or increase the pilot gas flow if necessary, by adjusting at combination control valve). Or the burner ports near the pilot flame are clogged and need cleaning. But, don't enlarge the holes. Low gas pressure can also cause this, but your repair person already ruled this out. If you have a wall thermostat, the Thermopile or Pilot Generator (it's the same thing) may be weak and failing. It's not generating enough millivolts of electricity to open the gas valve, when the thermostat is turned up. Or the Pilot Flame is not always touching it. If it is the Pilot Generator, the Cozy Part # is 70098 and cost around $40.00. A talented service man can install it easily.

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hi there

could have a faulty gas valve which may let in to much gas.extra load from the stove may be correcting this.
to much gas /too rich a mixture can affect internal temperatures causing thermostats to fail.
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Check for 24 volts across the gas valve when Ignitor is glowing. If no, bad board. If yes, bad gas valve or blockage.
On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

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Is the circuit board giving you a blinking error code?
On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

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Thermostat calls and from time to time won't ignite


I would first look at any wire connections both at the furnace and the thermostat. Then I would replace the thermostat. Check the units control board when it does not start for an error code. There should be a small viewing port to look into the furnace cabinet to see the control board.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

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This website
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Has very good troubleshooting and repair information for all of the possibilities

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I have a Maytag gas over/stove, Model number MGR5755QDW. The broiler heats, but the oven does not. What are the possible causes and how do I troubleshoot?


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The thermocouple itself may be burned out. It happens. It's a internal part of the gas valve so, no, you can't just change the thermocouple bulb separate from the gas valve.
But when you turn on the oven or the thermostat calls for heat, the pilot flame gets bigger and jumps down so it can heat up the thermocouple bulb. This extra gas to increase the pilot flame size comes from the thermostat.
If the pilot flame jumps upwards or just gets bigger, but doesn't shoot down, then you need to replace the pilot assembly.If the pilot flame size does not increase or jump down when turning on the oven thermostat, then the problem is the thermostat not sending enough gas to the pilot assembly. It's also possible that the pilot gas supply tube has a hole in it somewhere.
One final point on the spark-assisted pilot ignition systems. The spark comes from the spark module--the same module that sends spark to your surface burners to light them up. If you're not getting a spark when you turn the oven on, then there are several possibilities:
There could be a problem with the switch in the thermostat. You can confirm this by doing a simple continuity test of the thermostat contacts. If you don't read zero ohms when you turn the switch on, replace the thermostat.The spark module could be bad. You'll need to measure the voltage at the oven terminals of the spark module when you turn on the oven. If you get 120v but no spark, it's probably a bad spark module. Replace it.
Could be a bad spark wire or broken electrode.
Problems with the glow bar system.....You may even see the orange "glow plug" (called a hot surface igniter) glowing orange and so assume that it's OK. Not necessarily!! You have to measure the current/amp drawn by the igniter and compare it to this repair sheet before you can say it's OK or not. The gas valve has a bi-metal that open when a certain amount of current flows through it to heat it up. The igniter is wired in series with the gas valve. As the igniter gets older or weaker, it's resistance increases to the point where not enough current is flowing to the gas valve bimetal to open it up. As a result, the gas valve never opens up. BTW, a common symptom of the early stages of this problem is erratic temperature control in the oven due to delayed firing of the bake burner while cooking.
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You can get required parts from www.repairclinic.com
This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya.

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