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Burner lights, fan wont come on, fan runs on manual setting, has new fan switch set at 110

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YOUR FAN ON SETTING IS THE SECOND SETTING ON THE SWITCH .THE LOWEST SETTING IS THE TEMP AT WHICH THE FAN CUTS OFF AT THE END OF A SUCCESSFUL HEAT CYCLE. THE THIRD SETTING IS THE TEMP AT WHICH THE FAN COMES ON MAYBE 140 ISH. THE THIRD SETTING IS THE TEMP AT WHICH THE BURNER IS SHUT DOWN IN AN OVER TEMP SITUATION SAY 200 . THEN CONSIDER THE FACT THE SETTINGS ON THE DIAL ARE VAGUE. ACTUAL TEMPS MAY BE 20 DEGREES DIFFERENT, AND PROPERLY SETTING IS USUALLLY DONE WITH AN ELECTRIC THERMOMETOR.

Posted on Oct 25, 2008

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I have an early 80's mobile home with an "intertherm gas atmospheric furnace" pilot light is lit but can't get the furnace to "fire". Seems as though the limit control is stuck open. ...


If your pilot light is lit then I would first check your thermostat. Make sure it is on heat setting and fan is on auto, turn stat up to where it should be calling for heat. If you don't get burner to light remove front cover from thermostat and see if it has a mercury switch, if it does move temperature selector up and down and see if you can see a spark in mercury switch vial. If y ou cannot see a spark remove screws that attach t-stat to base.Remove carefully and disconnect wires that go to r and w terminals on stat base. Temporarily connect these two wires together. This should make burner light if you have power to thermostat. If burner does light disconnect wires and replace thermostat. Also if you have a volt meter check across these two wires and see if you have power there. Should be around 24 volts a.c. If your thermostat has a fan on setting try that. If fan runs you know you have power to furnace The gas valve needs 24 volts to operate and inside the electric control box in furnace there is a transformer to step down 110-120 supply voltage to 24 volts. If transformer is working you should be able to hear a low buzz or humming sound. You can also check across gas valve terminals when t-stat is set for heat, you should read about 24 volts. If you have 24 volts to gas valve and it is not opening then you need to replace gas valve. The main purpose of the limit switches is to turn blower on when temperature in heat exchanger reaches fan on temp,shut off blower after burner shuts off and heat in heat exchanger reaches fan off temperature, and limit if temperature exceedes set point without blower coming on. I hope this helps you. Thanks

Nov 25, 2010 | Air Conditioners

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I can't get my furnace fan to stop running-even in the off position


Your thermostat has AUTO and MANUAL for fan Make sure it is set for AUTO. If it is set for AUTO and the heat is off and cooled down AND the fan still runs then that will be a bad relay. If yours is newer then the board will need to be replaced. If yours is an older model you may need to replace the fan and limit switch8fe474e.jpgThis mechanical switch works on rise in plenum temp. It turns on the fan a around 110 f and it shuts down the fan at 90f. Newer furnaces use timers and relay on the IC board.

Oct 26, 2010 | Air Conditioners

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Burner lights and stays lit, but fan cycles on and off.


That sounds like a fan switch problem.
fan switch temperature setting to high
differential to close
bad fan switch or
return air temperature to cool

Sep 23, 2010 | Intertherm P3RA-048K Air Conditioner

1 Answer

Can you tell me the order in which each componet of a gas furnace comes on to start the furance?


Yes there is a sequence:
0:00 Dial for fan/limit switch is at 70 deg position. Furnace is cold. I turn T-stat to 80 deg to start furnace.
1:00 Burner comes on and dial begins to move slowly up.
2:30 Dial at 140 deg and fan motor comes on. Dial never goes above 150 deg.
3:00 Burner turns off. Dial slowly moves back towards 90 deg.
4:45 Burner turns on and dial is at 110 deg.
4:50 Fan turns off with dial still at 110 deg.
5:30 Burner off. Dial at 120 deg.
6:15 Fan on. Dial at 140 deg. Burner is still off.
7:00 Burner on. Dial at 120 deg.
7:40 Burner off. Dial still at 120 deg.
8:30 Fan off with dial at 110 deg., and it quickly snaps back to the 80 deg. position.
8:30 plus, cycle continues.....

Mar 25, 2010 | Air Conditioners

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Heat would not come on and fan would not cut off even when thermostat was set to off. Took off the outside panel of the unit and red light was blinking 7 times - rollout switch fault. Since fan would not...


this means that the rollout switch was tripped by a flame coming from burners. could be a plugged fue or bad inducer motor, or a bad rollout switch. the fan will not shut off as a safety feature it keeps running incase the heat exchanger is to hot to keep a fire from starting. it will shut off after disconnecting power and restarting everything. watch the flames from burner when it lights to see if the actually roolout of the burner box toward the rollout sensor.

Dec 08, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

3 Answers

Riello 40 F5 oil burner, on boiler, intermittently running


with a forced draught burner the fan motor would be checked via a pressure switch. if the pressure switch is not set correctly or the fan is too weak the contacts will not be made in the switch and the burner will lockout. if the damper is not open enough when the fan runs then the air supply will be too small for the switch to make. check to see if you have a capacitor on the fan windings if this is faulty then the fan will fail intermittently.

Jan 19, 2009 | Air Conditioners

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Burners go out before the fan starts


that makes no sense? the door on does exactly the same thing as you holding the switch closed and neither has anything to do with the problem you are describing. if door were off nothing would happen. if door was on ,nothing would happen unless the switch was closed. it may be coincidence, but sounds like the unit is not proofing the flame. look for a little needle like sensor that protrudes into the flame path in front of a burner. when the burners light it senses flame and tells gas valve burners lit and its ok to stay on. then heat builds and the fan is briught on. once in a blue moon the overtemp sensor trips open prematurely as soon as the burners start to heat up. it is a little wire in , wire out sensor above the burners that protreudes into the bulkhead above the burners. if it is cold and open its bad. if you jump it and burners light and stay lit and fan comes on its bad. fairly cheap and easy to replace. you may have an old fan limit switch the rotates like a spring to bring the fan on as it heats up, then turns off burner if its gets to hot or is set to low. it also turns fan of as burners cool down.

Dec 05, 2008 | Air Conditioners

1 Answer

Blower fan will not come on when set on Auto in heat mode.


the fan is controlled by a fan center or a stack switch. as burners light and heat up the spring sensor on the bulkhead above burners heats up and turns and a a point energizes the indoor fan if it gets to hot the burners go out on safty. sounds like a fan control is bad tap on them gently and they sometimes break loose but if not then have a pro replace fan control and test heat exchanger.

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1 Answer

Weatherking control board


the fan comes on only after the burner fires. so no stat voltage is expected. it is not powering the blower, the elec board is. only after burner lights will fan be energized due to heat build up. usually on older weatherking there is a heat sensor on the bulhead above the burners. it is stuck sounds like to me. try a sharp rap on the right side about four feet up the side and a foot back . if fan stops you know the switch was stuck . probably needs a new fan switch.

Oct 20, 2008 | Air Conditioners

1 Answer

Furnace come on then fan stops while burner still is on, then fan comes on for 1 min. and goes off over and over


This could be a couple of things, first is the fan limit switch. Make sure your fan limit is set at the correct settings, there is a fan on setting and a flame shut off setting located on the front of air handler inside the front cover. Usaully set at 140 fan on 200 gas shut off. You do not say what unit you have so this could be a pc board or module. Second this could be the blower it's self over heating and shutting down, feel if motor is gettig hot. This could be a run cap. or motor it's self. But it is more than likely the limit switch.

Sep 29, 2008 | Coleman Air Conditioners

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