Question about Honeywell L4064B2236 Fan/Limit Control Heater

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Thermostat starts furnace, burner goes on, comes up to temperature and the fan keeps trying to start and shuts off. The motor just keeps bumping over, will run for a few seconds then stop.

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  • mdaly86885 Jun 26, 2009

    Are you sure the problem is with the motor?
    Doesn't the fan/limit switch control the motor-
    couldn't the switch be bad? The motor will wind up a little each time it tries to start, then shuts down.

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2 Answers

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The fan is turned on by a relay, replace that relay, the contacts are most likely burned in the relay, also check all the connectors to the fan and it's controls for poor connections or signs of overheasting, the motor may also be going ouut and drawing excessive current.

Posted on Jun 26, 2009

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  • Master
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Seems like there is a problem with the motor, it will need replacing for it to correctly work.

Posted on Jun 26, 2009

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1 Answer

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Another cause could be using the wrong type of air filter. The new pleated filters sold block to much air flow. If air mass flow rate drops the difference in temperatur go up and when the difference in temperature go up, it gets nearer the high limit and causes it to trip. All pleated filters drop normal air flow through ducts by at least 35%. To make your air duct system work properly use the what is called throw away filters which cost about 1/3 the cost of the pleated filter. Remember to either clean or change the throw away filter monthly to reduce dirt being drawn into your duct system.
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1 Answer

Heil nulk075dg05


You have a dirty or bad heat sensor. When you remove the front panel on you furnace you will see a probe that is 2 or 3 inches long that is in the flame when the furnace fires up. If it doesn't detect a certain temperature within the first 30 or 40 seconds it shuts down the furnace. You can either clean the probe off with sandpaper, or purchase a new one. They aren't very expensive and are easy to replace. In my experience it is usually a build up of carbon on the sensor and a good cleaning with sandpaper and alcohol usually takes care of the problem.

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1 Answer

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