Question about Honeywell L4064B2236 Fan/Limit Control Heater

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Can not adjust limits

The limits on my limit control can not be moved. I tried to hold the dial and slide, no luck. I tried to hold and use a screwdriver to push them, no luck. Are they locked in place, i.e. Need to push them in, pull out, etc before sliding?

Thanks a bunch for any help.

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  • 88 Answers

Try sliding them in, if they refuse to move, I would recommend replacing it, they are not to costly, and a new one would be more of a beifit than a henderance, sometimes the old ones get a little rusty inside and will not move, they should move rather eaisly, hope that helped, please leave a feed back, thanks

Posted on Jan 20, 2009

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Posted on Jan 02, 2017

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My Elite Sliding Opener is not closing. It hits the the end of the gate hard and retracts back?


The Limit nuts are out of adjustment. This can be caused by the chain jumping the sprocket, usually when something gets caught in the chain or it has not been adjusted. It can also be caused by a cracked limit nut. The limit switch and nuts are located at the top of the operator (under the cover) and has a lid held on by a single screw. Loosen the screw, and remove the lid.





elite-sliding-opener-not-closing-hits-3i3gptxgjc4ofcs21h1ecra2-1-3.jpg Inside you will see two cogs on a threaded shaft with slots cut into them. These slots are there so the lever will keep the nut from spins and allow it travel down the shaft as the shaft turns. The limit nuts eventually contact the limit switch, stopping motor. Look closely at the sides of the nut to make sure there are no cracks allowing the limit nut to spread open and slip on the threaded shaft. You may have to clean them to see it.

elite-sliding-opener-not-closing-hits-3i3gptxgjc4ofcs21h1ecra2-1-6.jpg If there is a crack, usually found between the brass nut and a slot, you will need to replace the limit nut. Go ahead and do both nuts at the same time as it is a challenging process and you will want to do it only once.
If the nuts are not cracked, simply press the bar holding the nuts in place back with a screwdriver and spin the nut towards the limit switch until the gate stops about one to one and a half inches away from the post. The gate stopping point can vary even more than one and a half inches on slopes so if it starts happening again, give it even more space.

elite-sliding-opener-not-closing-hits-3i3gptxgjc4ofcs21h1ecra2-1-10.jpg Finally, a new limit nut may look different than the old one. The old ones with the brass nut encased in plastic had more cracking issues than the new all plastic nut shown here.

Good luck

Jun 29, 2014 | Elite Sl 3000 Ul Sliding Gate Operator

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

Cannot get rear derailer to work properly 24 inch girls evolution


Don't start messing with the derailleur yet! Make sure your shifting trouble isn't due to something else, such as a warped, dirty, or stretched chain, gummed-up pulleys, crud in the cable housing, trapped cable, or a bent derailleur hanger
Clean the chain and the rear derailleur pulleys. Pull the chain away from each pulley, and turn the pulley to make sure it can move freely. A pulley that offers resistance to turning must be replaced.
Now check the cable to be sure it slides freely. Mud and grit within the cable housing, or on a cable-guide, can keep the derailleur from moving a "full gear" during downshifts. If the cable doesn't slide freely in the housing, you may be able to clean or lube it to restore smooth shifting.
Let the high-gear limit screw. In your highest gear on the shifter, and with the chain on the smallest cog, position the derailleur so the upper pulley exactly matches the teeth of the small cog. Run the chain a bit with the front derailleur in the large ring, adjusting the limit screw until the pulley and the cog seem to match perfectly.

Setting the high-gear (small cog) limiting screw.



Once you're sure the derailleur matches the cog, move it just a whisker (1/8 to 1/4 turn) towards the other cogs. (You may need to readjust a bit if you get chain-skip.)

Closeup of setting the limiting screw.



Now adjust the low-gear limit screw. Shift into the lowest gear (largest cog). If it won't go, loosen the limit screw. With the chain on the largest cog (and the front derailleur in the small chainring), adjust the derailleur so the upper pulley exactly matches the teeth of the large cog.Once it's perfect, turn the limit screw so it moves the derailleur a tiny amount towards the other cogs (1/8 to 1/4 turn usually works).

Setting the low-gear (largest cog) limiting screw.



Now shift to the highest gear (smallest cog). Push the shift lever to downshift one gear (go from the smallest cog to the next-smallest). If it doesn't shift, tighten the cable with the barrel adjuster, 1/2 turn counter-clockwise. Backshift and try again. Continue tightening until it shifts. If it overshifts, going from the smallest cog to the third-smallest, loosen the cable by turning 1/2 turn clockwise. Backshift and repeat until it shifts exactly from the small to the next-smallest cog.

Fine adjustment of tension in the derailleur cable.





Now go to the second-smallest ring. Tighten or loosen the cable slightly, until the outer side plates of the chain are just clearing the third-smallest cog. Shift up and down, fine-tuning until you're satisfied.

Checking the position of the chain on the cogs.





Mar 04, 2011 | Pacific International Pacific Evolution 24...

2 Answers

Garage door wont go completely up


on the machine there will be a couple mini dials to be turned, these are the ones used during installation to get the correct distance for closing and opening, they should be labled, but not all are. one is for open adjustment, and other is for close adjustment. carefull, they can be verry touchy, meaning the slightest turn can make it move alot. a general way to adjust them is a half turn is equivlent to about 2" door movement.
good luck

Jan 01, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

I have a honeywell L4064A limit control i need to know what the setting should on the dial for fan limits bluescorpion_67@msn.com


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.

Nov 24, 2010 | 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

Xbox 360 controller left analog stick


If you bought it brand new, contact Microsoft ASAP.

Otherwise, no luck. Just an unfortunate side affect of playing a 360.

Apr 04, 2009 | Microsoft Xbox 360 Wireless Controller

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

Problem with MF-02 binocular microscope stage


I think your problem lies in the way the stage is limited upwards. On top of the stage, right behind it where it slides against the arm, there should be a little screw.  This screw limits the movement of the stage to a certain point upwards.  If the limit exceeds the adjustment gear and its opposing track, then the stage just goes up one notch and then it clunks down.  If you screw it down the stage is limited further down, if you screw it up it's limited a bit higher.  The point of this screw is to prevent objective and slide damage.  Try adjusting this little screw a bit further down and see if it still 'clunks' when you turn it up.  After that we may work on properly adjusting it.  If not, please post again with whatever detail you can provide to aid you with this problem further.

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