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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Posted on Jan 02, 2017

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How to set up data limit


Go to Settings Go to Mobile Data, check the box saying set mobile data limit, here you can set the time period and data limit, after which your data connection will be switched off.

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Furnace keeps tripping off on limit switch. replaced limit switch still trips, blower motor seems to work fine.


It's always possible that the limit "dial" switch is sticking leading you to believe that it's only at 150º.

How old is the furnace and when was it last cleaned.

Dec 12, 2007 | Heating & Cooling

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

High limit switch trips and needs re-set


After grilling or cooking at higher temps leave the oven light on so the cooling fan continues to run for approx 1/4 hour, or whatever setting will keep the fan running...

Apr 22, 2010 | Dacor ECS130 Epicure Electric Single Oven

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

Inconsistent pressure


As a first check, There should be 2 gauges and a pressure switch with histeresis.
You need to set the tank pressure switch above the regulated output pressure.
The tank pressure will fluctuate between the upper limit and lower limit set in the compressor switch.
The outlet regulated pressure should be below the lower of the switch settings or you will get a varied outlet pressure.
Try setting the tank pressure lower limit higher on the switch - above the outlet pressure required.
Always stay within the tank maximum rating.

If things are nor working properly, it may be the outlet regulator (make sure it is emptied of condensate daily) or a fault with the compressor switch if the tank pressure drops too low before starting.

If the compressor is on more often than usual, then it may need service or repair to worn parts. This is particularly true for vane compressors.

Aug 21, 2009 | Air Tools & Compressors

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

Door goes up, Won't go down.


It sounds like the limits are out of adjustment. With the door down, rotate the down limit until it clicks. Then raise the door manually, and set the up limit until it clicks. You should be able to hear the switch 'click' when it activates. Pay attention to which way the plastic nuts are moving on the screw going up and down. That way you know which way to turn them to set it.

Jun 28, 2009 | liftmaster Chamberlain Garage Door Opener...

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

1 Answer

Furnace come on then fan stops while burner still is on, then fan comes on for 1 min. and goes off over and over


This could be a couple of things, first is the fan limit switch. Make sure your fan limit is set at the correct settings, there is a fan on setting and a flame shut off setting located on the front of air handler inside the front cover. Usaully set at 140 fan on 200 gas shut off. You do not say what unit you have so this could be a pc board or module. Second this could be the blower it's self over heating and shutting down, feel if motor is gettig hot. This could be a run cap. or motor it's self. But it is more than likely the limit switch.

Sep 29, 2008 | Coleman Heating & Cooling

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