20 Most Recent Honeywell L4064B2236 Fan/Limit Control Heater Questions & Answers

I have been an HVAC repairman for 10 years and I have no idea why. Only thing I can think of is he didn`t know any better.

Honeywell... | Answered on Jan 21, 2015

move thermostat leveler

Honeywell... | Answered on Dec 28, 2013

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

Honeywell... | Answered on Nov 19, 2013

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.

Honeywell... | Answered on Dec 12, 2012

Maybe there is a blockage in the air conditioning coil above the furnace? This happens when people have pets, or dont use filters. Single phase 120-240 volt motors won't run backwards if you reverse the wiring that's dc or three phase, you have to check the rotation of the wheel, the right rotation is usually marked on the blower case. Some motors will allow you to change the rotation but you have to check the wiring diagram. Also use new capacitors when they go bad the motor can run backward. God luck

Honeywell... | Answered on Dec 21, 2011

sounds like a run capicitor is going bad. when looking at the blower do you see like a small metal canister with wires on top.

Honeywell... | Answered on Mar 12, 2011

if you have this fan switch as showen in your post you should be able to pull the on/off switch, white button, to turn it on and off to test. if it doesn't work you have no power or it is wired wrong

Honeywell... | Answered on Feb 15, 2011

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.
A/C, & Heating Contractor

Honeywell... | Answered on Feb 12, 2011

90 or 100 off, 140 on, 200 high limit

Honeywell... | Answered on Jan 29, 2011

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


Let me know if you have other questions on the adjustment

Thanks for asking-

Mack B

Honeywell... | Answered on Jan 26, 2011


Honeywell... | Answered on Jan 05, 2011

http://www.inspectapedia.com/heat/Fan_Limit_Switch_Installation.htm#Wiring Go here, it is a super site for just about everything home related.

Honeywell... | Answered on Dec 30, 2010

The dial positioning does not really matter as this is a thermometer of sorts. It is a thermo controlled switch, upon reaching the desired temperature it turns on the blower and upon cool down it shuts off the blower. The dial positioning is not necessarily critical but with him turning it he could have damaged it meaning that instead of registering at say a set 150 degrees it may actually be more than 150 or less than 150 and it will work just the set temperature may be wrong. Confusing isn't it!!

Honeywell... | Answered on Dec 27, 2010

if it is the fan that wont cut off, make sure the manual over ride button,(white push/pull) is in the auto position.if the burner will not cut off then the spring on the control is failing and the control should be replaced.control can be found online or at most heating supply companies.

Honeywell... | Answered on Dec 20, 2010

try checking the gas pressure might be to high or low thats what i would check first

Honeywell... | Answered on Dec 11, 2010

sounds like a bad switch has to do wth your high limit kicking it out

Honeywell... | Answered on Nov 29, 2010

The correct setting is whatever setting you want. Set the fan on at some temperature, set the fan off temperature at about 20 degrees below the on setting. If it still runs a short time, either increase the on time or decrease the off time. If the off temperature is comfortable to you then I would suggest increasing the on temp. Do the changes in small steps. Good luck and keep that oil burner tuned...

Honeywell... | Answered on Nov 27, 2010

Not finding what you are looking for?
Honeywell L4064B2236 Fan/Limit Control Heater Logo

62 questions posted

Ask a Question

Usually answered in minutes!

Top Honeywell Heating & Cooling Experts

Paul Carew

Level 3 Expert

3518 Answers

Cindy Wells

Level 3 Expert

6161 Answers


Level 2 Expert

80 Answers

Are you a Honeywell Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

Honeywell Heating & Cooling

  • Honeywell Heating & Cooling

Most Popular Question

bad fan limit control honeywell l4064a

  • Heating & Cooling