Question about Honeywell L4064B2236 Fan/Limit Control Heater

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Fan cycles on and off to often the burner stays on and the fan cy

I turned the fan to on position on the TS and watched the burner it stays on until temp. in house is reached then it turns off.
If I put the TS in auto position the burner comes on but the fan cycles every 30 to 40 seconds?

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  • verilog Mar 11, 2009

    I have the same issue. It has gotten worse throughout the winter. I have an older Ruud 80 heater. The heater fan control unit has a dial that rotates to an "on" position for 10 to 15 seconds, then snaps back to the off position. This will continue without stop now. The switch will not stay on. I am also using a Honeywell digital thermostat. Is this a problem with the heater fan control unit? A mechanical problem maybe? Thanks for any responses.

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What is happening is that the heat exchanger has to get to a certain temperature before the fan comes on that way you have warm air blowing out of the grilles and when the heat excahnger gets cool it shuts off until it warms back up again.

Posted on Jan 25, 2009

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