Question about Honeywell L4064B2236 Fan/Limit Control Heater

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The fan limit control switch on furnace is not working proper can you clean the device

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Paul Carew

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Yes you can remove it and clean the back undo 2 screws and it will slide out

Posted on Nov 21, 2010

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Gas furnace short cycles 2 minutes or less. Multiple troubleshoot steps and replaced components - no help. Any advice?


I did not see that your indoor fan motor started. Near your indoor fan motor there is a temperature switch that is called the fan delay relay. On a temperature rise the relay shuts a contact that turns on the indoor fan motor. If the contact does not close the high temperature limit will shut the gas controls off like your getting. A fan delay relay also allows the fan to run a minute or so to carry away the remaining heat in the furnace and help cool the furnace down. The fan delay relay is normally mounted in a recessed area in the fire wall of the furnace plate. I have also seen them on the top of the furnace heat exchanger. Anyway, the fan delay relay will probably not be available on a sunday, so temporarily until parts are available, try turning the thermostat fan from auto to on and try the furnace again. By turning on the fan to on the high temp limit will not shut you down again.

I have had high temp limit change there trip points, but you said you bypassed it and did the same thing.

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.
Hope this helps.

Feb 13, 2015 | Heating & Cooling

1 Answer

INTRTHERM MODEL MGHB -056ABFC-09 FAN KICKING IN OUT EVEV WHEN WARMED UP


The fan speed might be set to fast cooling the fan limit control prematurely. Or the fan limit switch is not calibrated correctly. Or the fan limit switch is bad.

Dec 21, 2013 | Intertherm 56000 Btu Gas Furnace

2 Answers

Why does the led on my furnace control bd flash three times


Hello, this indicates a open limit switch. A limit l switch will open when the temp in the heat exchanger gets too high and this switch shuts the Furnace down for safety. Usuaully a dirty filter, weak blower motor, dirty blower wheel will cause a limit switch to open.

Nov 12, 2011 | Heating & Cooling

1 Answer

Gas furnace with Honeywell smart valve code error 6:2, replaced the following: pressure switch, smart valve, ignitor flame sensor and control board. Cleaned out the condensate line. Still getting 6:2 flash...


Hello, it sounds like your Furnace might be shutting off due to your high limit switch.A limit switch will open when the furnace overheats due to low airflow, . check air filter, clean blower wheel, and check to make sure the blower wheel is running at proper speed and not dragging sometimes cause by a weak capacitor. Anything that restricts airflow will cause a limit switch to open.

Mar 08, 2011 | Honeywell Heating & Cooling

1 Answer

I have a dyno glo rmc-fa100dlx forced air heater. It will light and work for a few minutes, up to about 5, then it will stop heating and the fan will keep blowing. any ideas? thanks!


If the unit comes on and runs but then shuts down, that sounds like an indication of a high limit trip.

Most, if not all, furnaces have high limit switches that keep a constant check on the temp inside the furnace or air handler. On most systems, once this high limit switch has been made (got to hot), the limit switch breaks control voltage to the heating device (strips, gas, fuel, etc.etc..). The blower motor continues to run until the high limit has dropped in temp and reset itself.

On some models, the high limit is a manual reset, meaning you need to reset the switch yourself or shut the unit off and then back on to reset it.


Check all filters and replace as necessary. Check the coils and fan blades for dirt build-up and cleanliness. Check motor belt (if applicable). If all these fail to solve the problem, then your issue either lies within the blower motor itself not moving enough air for proper heat transfer. Or the high limit switch itself is failing.

Jan 09, 2010 | Heating & Cooling

1 Answer

Dayton blower fan repeatedly kicks on and off


chech the air filter is clean and the fan limit switch look to change fan limit

Nov 01, 2008 | Dayton Gas Furnace Heater

1 Answer

Fan switch will not make (limit switch).


If the snap switch is not located close enough to the plenum, this can be problem. The other option would be to cover the switch area with a metal shield or liatherm paper (fire rtardant paper).

Jan 27, 2008 | Cozy Enclosed Front Console Heater 70,000...

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