Question about Honeywell L4064B2236 Fan/Limit Control Heater

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I have a honeywell L4064A limit control i need to know what the setting should on the dial for fan limits [email protected]

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Jack Spooner

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First thing I would suggest just to be on the safe side before you began shut power off to unit.
Remove cover on combination fan and limit.
I would set the fan on at 130-140 and fan off at 90-100 degrees. When you adjust setting grasp the outside of the dial to stop it from rotating when you are moving set point indicators. Replace cover and turn power back on. I hope this helps you. Thanks.

Posted on Nov 24, 2010

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I have a bad fan/limit control Honeywell L4064A 2188.What would sbe a suitable replacement part number?


take original honeywell model # go to honeywell site and look for original part # and it will give you cross reference #s

Nov 05, 2013 | Honeywell L4064B2236 Fan/Limit Control...

1 Answer

How do you adjust settings


take cover off and hold round dial so it dosent move. there are 2 tabs in the dial . the one on the left is the low limit. the one on the right is the high limit.high limit is when the furnace shuts down 200. the low limit is when the blower will stop 90 to 100 degrees.

Dec 02, 2012 | Honeywell L4064B2236 Fan/Limit Control...

1 Answer

Blower fan running constant after new fan and limit switch installed.more info.Honeywell-tradeline.L4064B 2210, combination fan and limit control, adjustable fan differential with manual fan switch, flush...


Here's my best shot.
Check the temperature settings for the fan switch.
The low OFF setting should be about 100 degrees.
The ON setting should be around 150 degrees and this is the setting that "makes" the ON contacts.
The HIGH LIMIT setting should be about 180 degrees.
If these are set, can you use a meter to see if the FAN ON contacts are closed?
Lastly, it appears that one hot line should go to one side of the blower and the other hot line should go to the bottom FAN terminal with the other side of the blower being fed by wiring from the top FAN terminal.
Good Luck. Gary

Feb 21, 2011 | Honeywell Heating & Cooling

1 Answer

I have 2 hvac units running an electric heating element for the heater. Both limit controls are set the same. One is ignited the flames and continuing with flames for close to 3 min. The other is taking...


Hi, these Honeywell combination fan/limit controls are used for turning the fan on after the combustion changer reaches the factory setting on the round dial that you see when you remove the cover. The high limit will turn the fan on when it reaches this temperature, and off when the stat is satisfied. If the blower motor fails due to a burn out or short, it shuts the main burners down on the high limit setting. These controls can be removed and you can clean the probe which has a set of contacts at the end. Sometimes this will fix the problem. Check the settings on the dial to see if they are set right to come on, the time it takes between cycles, and the temperature they are set to shut off. This sounds as though you need to check your thermostats also. They could be a problem. You say electric heat, but then you are saying flames? If these limits have the manual fan button, make sure they are on auto. Long delays could also mean you have a dirty flame sensor located by the pilot. You can clean the metal tip with steel wool or fine sanding cloth. Short heating cycles may be your thermostats like I said before. You shouldn't have to replace the fan/limits as I told you what they control. These will cause a fan to run and not shut off after the stat is done, so check to see if they are dirty. Please keep me posted.
Shastalaker7
A/C, & Heating Contractor

Feb 12, 2011 | Honeywell L4064B2236 Fan/Limit Control...

1 Answer

What is a good seting for fan limit


I just did a search-- Here is an excellent, illustrated article on the purpose and settings of this important Fan controls switch- Enjoy!

http://www.inspectapedia.com/heat/FanLimitSwitch.htm

Let me know if you have other questions on the adjustment

Thanks for asking-

Mack B

Jan 26, 2011 | Honeywell L4064B2236 Fan/Limit Control...

1 Answer

What should the inside dial be set at? there are three positions.


For most applications I would set fan on at 140 Degrees, fan off at 90 degrees and fan limit should be either factory at 190-210 or I would set it at 190. When you are setting set points on dial you should hold outside of dial so it can't move and set inner indicators where you desire. If you want you can vary by a few degrees but I would not go below 90 on fan off or above 140 on fan on. Possibly 100 and 120. Hope this helps you. Thanks

Nov 14, 2010 | Honeywell L4064B2236 Fan/Limit Control...

1 Answer

The fan runs whether the thermostat is turned on or off. If the thermostat is on, the burners fire up. The only way to get the fan to stop is to inplug the furnace.


Chances are you ahve a bad fan limit switch. If it is adjustable try to adjust. Set at 90 and 120. If it is off a little move the temp up a little. Should have slide dial under the lid on the fan limit. Keep in touch Rus

Nov 25, 2009 | Honeywell L4064B2236 Fan/Limit Control...

1 Answer

Burner lights but limit switch will not turn fan on automatically. the burner will shut down if i don't run fan manually. is it the limit switch?


Hi, Yes, you have the answer to you're problem. Now, I don't no if you have just a high limit, or a combination Limit control? I will go with the combination fan control as when they go bad, they stick in the closed position and they have normally open contacts. When the heat exchanger starts to heat on a call for heat, there is a dial on the fan control with temp. settings on it , and it will start to rotate as the heat gets higher. When it reaches its set fan on temp, it with start the fan.We no the fan works so the blower is good, so it shuts the burners down on you're high limit temp. which is factory set to about 250*F. When you turn The t-stat from auto to on in the fan side, that solves the problem temp, only. You will need to R & R the Fan control. If you need some direction on doing this please let me know and if it is a Honeywell auto/on type that is rectangular in looks, and if you remove the cover you will see the temp. dial with arrows on it. Thank you.
Best of Luck, and Sincerely,
Shastalaker7


Nov 21, 2009 | Dayton Electric Heater

1 Answer

Blower fan runs to long


ther might be dip swiches on the circuit board you might have to change

Dec 17, 2008 | Honeywell Power Humidifier: Furnace...

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