Question about Honeywell L4064B2236 Fan/Limit Control Heater

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Settings for switch

I need setting for limit switch

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Shut off 80-90, on around 130-140, high limit (if you can set) 160.

Posted on Jan 28, 2009

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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

When furnace goes off after heating the house, it will come on again for a few seconds then shut off. It usually does this once but sometimes twice.


This is usually nothing to worry to much about. What is happening is that setting for fan off on limit is set a little high which will cause blower to shut off while there is still some heat in heat exchanger. If this is a older unit you can set the fan off setting on limit switch. If it's a newer unit and you have the manual you can change setting on control board. If you can tell me more about age of unit I would be happy to try to tell you how to set limit. Thank you

Nov 19, 2010 | Heating & Cooling

1 Answer

How to properly install plenum limit switch


If this is the old style limit/fan switch. Turn power off
remove the wires and label where they got disconnected from and wire the new one in. Make note of the settings on the old limit switch so you can
adjust the new one. The limit switches come in
different lengths so get the right one.

If it is a flat bimetal disc, then I think you have only to
wires that have to be connected so hook up same
to wires from the old one. With Bimetal disc fan
limits you need to make sure you get the same
temperature reading as the old one

Jan 16, 2010 | Cozy Enclosed Front Console Heater 70,000...

1 Answer

Heater stops.fan still runs.


Most furnaces are equiped with a two speed blower. Hi speed is controlled by a relay sytem initiated by the thermostat. short of a stuck relay, hi speed should not remain on unless your thermostat "fan swith" has been moved from "auto" to "on", if this is the case turn the switch to "auto"

Low speed is controlled solely by the furnace itself. Depending on the age and brand of the furnace it is either brought on by time or temperature.

From your description of "tapping the relay of the limit switch" I assume you have an older furnace with a combination fan/limit control. The most common of these were a grey box with a removeable rectangular lid. In some cases there was a (commonly white) switch poking through this cover which you could manually turn low speed on if you pushed it in, make sure it is pulled out.
Otherwise the switch is refered to as a bi-metal limit. When heated the two dis-similar metals (coiled together) expand and contract at different rates. When the furnace cycles on, the metals heat and, due to design, twist a dial, which you should be able to see under the rectangular lid. The dial should have three pin settings for the purpose of switching. the lowest setting, usually around 105, is the fan OFF setting. The second, usually aroun 135, is the fan ON setting. The highest should be fixed around 250 it is the high limit and should not be part of your problem.
....After your thermostat has been satisfied and the flame shuts down...you can physically watch that dial move clockwise and hopefully reach the setting of around 105, unlesss that setting is set below the temperature of the room the furnace is in (try setting this setting higher to see if it helps).
(make and age of furnace helps a lot with trying to trouble shoot, also is it a mobile home unit?)

Dec 28, 2009 | Coleman Propane Forced Air Heater...

2 Answers

GOODMAN GMS9 limit switch


check the temp on the switch.Any switch will work as long as it has the same temp setting.

Oct 30, 2009 | Goodman GMS90703BXA Heater

1 Answer

Coleman furnace and the fan takes awhile to come on then runs for about a minute then shuts down. im thinking the fan cycling switch was moved and now takes longer to reach temp


If it operates on a fan/limit switch it is possible the settings are wrong. Typical settings are: Fan Off-110F Fan On-140F High Limit-170F. If these are correct, you probably have a bad f/l switch. The bi-metal spring in these switches fatigue and will not rotate the switch smoothly.

Oct 03, 2009 | Heating & Cooling

1 Answer

Goodman furnace\ blower comes on,unasked


Sounds like the fan switch on the furnace is set to low. Turn power off to furnace, take door off of furnace look for a fan switch, it may be a fan - limit together. The limit settings should be approximately 160° to 200°, and the fan settings should be about 100° to 140° set it to 120° it it's already set there then you probably need to replace it.

Aug 03, 2009 | Heating & Cooling

1 Answer

Main limit switch


I am providing some information, but I encourage you to have a furnace technician look at your furnace. The reason is; the limit switch trips when there is a problem that may present a fire or combustion hazard. I've seen these switches go bad, but not very often. Usually they are tripping because the plenum is sooted up and excessive heat builds in the combustion chamber. This is common in older furnaces that have pilot flames- the flame runs all year and soot deposits in the plenum, plugging the air flow through the combustion chamber after years of use.

The limit switch is a safety control switch located on the furnace just below the plenum. If the plenum gets too hot, the limit switch shuts off the burner. It also shuts off the blower when the temperature drops to a certain level after the burner has shut off. If the blower runs continuously, either the blower control on the thermostat has been set to the ON position or the limit control switch needs adjustment. Check the thermostat first. If the blower control has been set to ON, change it to AUTO; if the blower control is already on AUTO, the limit switch needs adjusting.

To adjust the switch, remove the control's cover. Under it is a toothed dial with one side marked LIMIT; don't touch this side. The other side of the control is marked FAN. There are two pointers on the fan side; the blower goes on at the upper pointer setting and turns off at the lower pointer setting. The pointers should be set about 25 degrees apart. Set the upper pointer at about 115 degrees Fahrenheit and the lower one at about 90 degrees Fahrenheit.

Mar 15, 2009 | Heating & Cooling

3 Answers

Heater won't come on when temp drops...must reset limit switch every time.


The limit switch is shutting off and you are having to press the re-set button, right? The limit switch, if I am understanding you correctly, is the thermal disc type, may be ok, but what is causing it to shut off? I would first, not put total faith in the serviceman (PG&E maybe) and replace the limit switch. Its only a few bucks,and easy to do. Then if its still the same problem, look into the venting pipe. As it may not be adequate for the heater. Espically if its new. These new wall furnaces are kind of touchy. It may be larger, BTU wise, and the vent pipe may need to be enlarged. If this is a big job, and a bit too impractical, check the vent pipe, make sure its in good conditon, no leaks ect. install a cO2 detector and by-pass the limit switch.

Jan 07, 2008 | Cozy (W352E) Heater

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