Question about Honeywell L4064B2236 Fan/Limit Control Heater

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Question on a day and night gas forced air heater

The burners ignite, although the fan does not come on, The burners then shut off after a short time, alhtough the entire furnace is very hot..This process repeats itself although the blower never comes on therefor not heating the home...

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It very well sounds like your fan switch , does your fan work at all, like in ac mode on by turning the fan on/auto switch on the thermostat to ON. If the fan does come on its the more and likely the limit switch. if it doesnt come on it could be the motor or the run capacitor. the limit switch has a dial on it that as it heats up it spins clicking on at a desired set temp ussually about 120 to 150 degrees F. turning on the fan if the fan doen't come in the the next setting clicks off the gas valve turning off the burners ussually set at about 220 degrees F. now if the fan is working when the heater is satisfied there is a setting at about 90 deegrees F. that shuts the fan off hope this helps

Posted on Jan 05, 2009

  • carl carpenter
    carl carpenter Jan 05, 2009

    it very well sounds like your fan switch , does your fan work at all, like in ac mode on by turning the fan on/auto switch on the thermostat to ON. If the fan does come on its the more and likely the limit switch. if it doesnt come on it could be the motor or the run capacitor. the limit switch has a dial on it that as it heats up it spins clicking on at a desired set temp ussually about 120 to 150 degrees F. turning on the fan if the fan doen't come in the the next setting clicks off the gas valve turning off the burners ussually set at about 220 degrees F. now if the fan is working when the heater is satisfied there is a setting at about 90 deegrees F. that shuts the fan off hope this helps

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