Lennox heater does not heat

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  #1  
Old 11-29-03, 09:54 PM
pdxjim
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Lennox heater does not heat

Thermostat tells heater to turn on and fan does not operate. The electric pilot light comes on but the fan does not operate. The fan will operate from the thermostat by Fan Only. The heater was working yesterday but today, does not work.
 
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Old 11-30-03, 12:10 AM
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Lennox heater

1) Check the spillout switches which are usually manul reset.
2)Check whether the furnace is trying to start, Turn off the power wait 3 mins turn back on (with the stat turned on)
3) check fuses etc.
4) Try shorting out w & r on the room stat to see if it wants to start then.ie she sparks the ignition.
 
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Old 11-30-03, 08:32 AM
pdxjim
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I am somewhat capable of doing the above. What/where are the spillout switches?
 
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Old 11-30-03, 10:45 AM
pdxjim
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I did 2) above and the heater started working properly. Then, maybe 10 minutes later, it stopped operating. Any suggestions would be appreciated!
 
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Old 11-30-03, 09:47 PM
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Lennox Furnace not heating

Hi. Again
When it stopped did it stop on stat or just lock out.
When it locks out the best way to reset is to turn the power off, then on again.
almost sounds like the limit is going. Does the main fan blow the usually amount of air? Is the filter clean? The return air not restricked in any way. does the main fan sound the same as usual?
What can be happening is the fire starts up then a few minutes later when the main fan starts up it is not blowing enough air though the furnace to keep the temperature down and the temp rises and the limit switches off the fire while leaving the main fan going. Then when it cools down naturally the only way to reset is to turn the power off as I said.
The limit is there to protect the furnace from getting too hot and causing a fire harzard and to save burning the guts out of the heat Exchanger.
DON'T EVER BE TEMPTED TO BYPASS A LIMIT.
 
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