Question about Coleman Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU)

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I have a propane furance in a mobile home. When I turn the thermostat up the furance comes on a heats the room to the set tempature. after the room cools back down the thermstat clicks but the burner will not light. The gas valve starts humming. I have replaced the thermost, thermocuple and gas valve. any ideas?

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  • steve_farrar Dec 09, 2009

    If I turn the thermostat down and back up a couple times the burner will light and it will run another cycle.

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  • 288 Answers

If you are getting power to the gas valve, then all of the safety switches should be closed. if you have any drain lines off of the inducer fan and at the bottom of the heat exchanger, make sure they have a trap and have water in them. the pressure switch may be the culprit.

Posted on Dec 09, 2009

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1 Answer

My totaline thermostat model #p474-0100-a the backlight is staying on and when the furance is running after only a couple of minutes it shuts off and my furance shuts down .


Multiple issues that are not related. If the pilot light goes out then the thermocouple might be bad. If the pilot ignites the gas and everything shuts off, it sounds like the over temperature sensors are detecting heat in excess of what is allowed in the firebox. The thermostat issue has nothing to do with this.

Nov 19, 2014 | Heating & Cooling

1 Answer

Can not operate the furance, it just wont come on


Sounds like more is wrong than the thermostat. If gas heat,make sure the pilot light is lit and there is gas pressure.If fuel oil,you may have to press the restart button on the burner unit. or blead the the pump.

Sep 15, 2014 | Hunter Set and Save Programmable...

1 Answer

Temperature control


Try this simple test
Turn the thermostat down to room temperature
If it turns off when you reach room temperature it means the thermostat is ok
Now if you place the thermostat back to 82 as you say you must have to leave it there until the warmth returns to the furnace thermostat
So it's either bloody cold were you are or your furnace is undersized

Dec 26, 2013 | Kitchen Ranges

1 Answer

Aux heat comes on


If you turn your heat on and the temperature is set 3 degrees above what the actual temperature of the room, the auxillary heat will automatically come on. The auxillary heat is an electric heat strip that provides heat to your home while the heat pump is in defrost cycle or if there are extremely low temperatures outside. Try not to set the temperature more than 2 degrees above the actual temperature of the room. Hope this helps.

Jan 25, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

AC IS TURNING ON BY IT SELF AFTER I SWITICH IT OFF, HOW TO SOLVE THIS PROBLEM


Sounds like a problem with the furances circuit board. With the furance powered off, disconnect the two wires at the circuit boards thermostat terminal strip. These are probably red and white wires connected to the "Y" and "C" thermostat terminal strip on the circuit board. These two wires send 24 volts to the outside A.C. condenser unit when the thermstat is se tinto the cooling mode. With the thermostst in the "off: postion measure across the "Y" & "C" terminals at the furances thermostat terminal strip. If you have voltaged than either the board or thermostst has failed. The next step to determine which has failed is this. Disconnect all the thermostat wires at the furance. To check the heating circuit jumper across the "R" & "W" terminals, the furance should fire off for the heating circuit and run non stop beacause the thermostat is no longer controlling it and is isolated from the furance. Now remove the jumper and jumper across the "R" &"Y" terminals, the blower should run at your furance for the cooling mode and you should have 24 volts across the "Y" & "C" terminals for the outside A.C. condenser compresor contactor.Next check for blower operation by jumpering across the "R" & "G" terminals. If everything checks outs than the thermostst is the problem. Tou may also want to check the control wiring at the thermostts , furance & out side condenser unit. If the wiring has connnected somewhwre between these points or at the terminal connection this may also be bring on the A.C. when the thermostat is in the "off position.

Feb 13, 2011 | Hitachi Heating & Cooling

1 Answer

Unless we set the thermostat very high, like 80 degrees, the heater will blow cold air. When the heat does blow, it will eventually stop blowing heat and the fan will continue to blow cold air.


Check and make sure the filter is clean. This sounds like a restriction in the system. If the unit has central cooling make sure ther indoor evaporator coil is clean at the furance.The unit may be cycling the burners on and off at the high heat limit , fan/limit control. You can also eliminate the thermostst from the furance. Turn power off at the furnace and disconnect the wiring from the thermostat. Jumper the red and white wire together. Turn the furnace back on. The furance should run in the heating mode. Try this and see if the problem is still there.

Jan 25, 2011 | Heating & Cooling

1 Answer

I can not change the thermostat setting on the unit. Whenever I try to change it, it reverts back to the previous setting.


The thermostat will display the current tempature in the room. When you press the buttons to change the tempature and you see it change back it is probably going back to the room tempature display but still keeping the temp you set it at. Also make sure the "hold" feature is set or the temp you choose can change at different times during the day due to the programmable features built into the thermostat.

Sep 08, 2009 | Honeywell Heating & Cooling

2 Answers

My air handler comes on ,not the outside unit when my thermostat is in the off position even if i turn the thermostat down to 50 and have it turned off the air handler comes on for about 5 to 10 minutes...


If you have a standard thermostat the fan switch is for the air handler only. It completely over rides the thermostat for most settings. Now lets see this is what I'd expect:
fan switch on Indoor fan runs all time
Fan switch auto Indoor fan only runs when thermostat is set to cool or heat and the thermostat is turned up above room temp for heat or below room temp for cooling. In both of these modes the furnace blower comes on and stays on til the room temperature is satisfied. The outdoor unit only comes on for AC the out door unit will not come on for heat or the "on" setting on the thermostat. See exception 1 & 2 below...

Exception 1- (in a heat pump the out door unit runs in both heat and cool mode unless it has emergency heat turned on then it will not come on outside in the heat mode, and depending on the type of heat pump and furnace or air handler it is). A heat pump thermostat usually has "backup heat" and an "emergency heat" setting switch on the thermostat.
Exception 2 - On some thermostats they are made to cycle on the heat if the temperature reaches a preset temp (around 50'f usually but definitely by 40'f). This mode prevents freezing when if instance the homeowner is away or while the home is under construction. In this mode the fan inside can run but the heat usually comes on with it.
Exception3 - On some electric furnaces the heating strips may be individually controlled and thus not all come on at one time. This may give the feel of no heat especially if the room is cold.

Now there may be other exceptions but Ive tried to give you a heads up on some of the most common ones.
If you need more help please post more specifics about your unit/system as to for sure what switches are set to what setting and what is happening with each. My first though was that maybe your system is OK and you needed to know if the thermostat was working properly.

If this helpd you understand your problem would you please give me as hifgh a mark as you can. Thnaks for using fixya and good luck.

Mar 28, 2009 | Carrier Heating & Cooling

1 Answer

Short cycling


There are a few reasons why your furnace is restarting after it reaches temp. and shuts off. First, if you have a mercury bulb thermostat it needs to be level and the heat anticipator needs set properly. If you have an electronic thermostat then you need to make sure the DIP switch settings inside are set properly for propane. If you have a digital thermostat there are also settings to be made for your type of heating. These settings will be explained in the thermostat installation instructions. Also, Make sure your furnace filter is clean. If this does not help then there are some other things to check which may need to be done by a technician depending on your mechanical aptitude. Hope this helps!

Dec 08, 2008 | Coleman Propane Forced Air Heater...

1 Answer

Thermostat displays 79 deg but really 68 in room


If the thermostat does not have a reset, replace it.

Nov 05, 2008 | Honeywell Programmable Thermostat Heater

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