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Comfort Maker Gas furnace Model number AS48M180T will not stay on long enough to heat home

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Posted on Jan 02, 2017

hotuna
  • 288 Answers

SOURCE: gas furnace wont stay lite

I'm a little confused by your terminology. You are saying you have a pilot lite and electric heat strips? Are you possibly meaning burners? Is the heater running for 2 hours straight without shutting off? how cold is it there? Lastly what temperature do you have the thermostat set at and how close does it get to the temp. before it shuts off?

Posted on Dec 20, 2007

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I AM WORKING ON A COZY W501E WALL FURNACE AND CANT GET THE PILOT TO STAY LIT. i HAVE CHANGED THE GAS VALVE, THERMOCOUPLE,AND THE SENSOR FOR THE HIGH LIMIT. THE PILOT WONT STAY LIT.


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:
https://www.youtube.com/watch?v=suen7QlJl4o

Gas furnace will not light Thermocouple test with the multimeter

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

Feb 11, 2015 | Cozy Heating & Cooling

1 Answer

How do I tell the age of my Comfort Maker furnace?


Check for a serial number. Inside the door or near where the wires go in.

Sep 13, 2014 | Heating & Cooling

1 Answer

What is a two stage furnace?


Two stage heating is a method to make your home more comfortable while reducing your energy. Sound contradictory? Well, that's the truth. Two-stage furnaces are designed to operate like two separate furnaces, maintaining more consistent comfort levels throughout the home. Your furnace or air-conditioner maintenance group will be able to give you more information regarding their working, but I'll explain the basic facts.
A two-stage furnace will always start in the first stage and attempt to meet the heating demand. During mild winter only the first stage will be required that to running at about 60-70% of its efficiency.When temperatures drop, the furnace adjusts itself and enters the second stage to meet the demand for heat within the home. With two-stage heating, a homeowner has no need to keep adjusting the thermostat.

Jan 17, 2014 | Dayton Gas Furnace Heater

1 Answer

Gas valve clicks when furnace is running


is there a second call for a flame on during the heat cycle..it may be worn out or the signal to open is not strong enough..

Jan 08, 2014 | Honeywell Icp Heil Tempstar Furnace Spark...

1 Answer

My goodman furnace 80703 fan comes on ignitor glows burner starts , cuts off in 10 secs,furnace starts cycle again. home no heat


I am not a furnace tech but, there are several inputs to a gas valve. There must be an 1) electrical/mechanical indication that there is a draft fan running (to move potentially explosive gas so it doesn't accumulate), 2) adequate gas pressure to the valve, 3) the thermostat must be calling for heat 4) and electrical indication that there is an ignition source. In your scenario, you have the source of ignition, the gas valve is picking up the burner but the gas valve believes there is something missing so it shuts off the gas to the burner. In this case, I suppose you might not have enough gas pressure (is another gas appliance running or is the line to the furnace too small?), a thermocouple probably isn't the problem since the burner wouldn't pick up if the gas valve didn't believe the ignition source wasn't good enough. You could have a plugged chimney or exhaust pipe if it is direct vented since there is also a pressure switch that detects whether there is enough draft once the burner picks up. Really should call a furnace person especially if you don't have a carbon monoxide detector that you trust. If you think you are capable of continuing, you could jumper the various inputs the the gas valve one by one until the burner picks up and stays picked up. Whichever terminals you jumper that accomplish this, is the culprit. Look at the schematic on the side cover to the furnace for this information. Hope this helps...

Oct 01, 2011 | Goodman GMS90703BXA Heater

1 Answer

How do you lite the pilot lite on a Rheem Gas Furnace Model #rgma-125a


If I recall correctly, model number Rheem furnace you listed has electronic ignition to light the pilot, when the home's thermostat calls for heat. Is this what you're having a problem with?

Mar 11, 2011 | Heating & Cooling

1 Answer

Furnace does not turn on normally


Having to reset it tells me that there is probably an error code blinking on the control board. Look for a small viewing port that looks into the cabinet. Count the number of blinks then remove the panels to find the wiring diagram pasted on one of them. On the diagram you will find a diagnostic code to help you narrow down the problem. It could be as simple as a plugged air filter.

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).

Feb 07, 2010 | Goodman Heating & Cooling

1 Answer

Furnace pilot is not igniting.


the first blower you hear is the inducer motor it pushes the exhaust out. sounds like abad gas valve.do you have a standing piloit light or is it eletronic ignition. if electronic and there is no glow you have a bad ignitor

Oct 04, 2008 | Honeywell Power Humidifier: Furnace...

1 Answer

Cycles too soon


If the thermostat has been changed since last heating season maybe a thermostat setting.

Dec 28, 2007 | Heating & Cooling

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