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Resetting hi and lo limits on honeywell L7103 h2o heater control

How do Imake the adjustments?Upper limit is158 degrees,should be 145.

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Instruction book says to press the UP, DOWN and I buttons on the circuit board all together for 3 seconds. Then press the I button until the item you want is displayed i.e. the upper limit set point. Then press the DOWN button until you have set the temperature you want. After 60 seconds without any inputs, the temp is set and the system goes back to READ mode.

I just got one and need to set my upper limit from 130 to 140 degrees. Showers are a bit cool.

Hope this helps.

Posted on Apr 05, 2009

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Get a new limit that is 145

Posted on Jan 25, 2009

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1 Answer

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...

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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...

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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

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

Heat stops aprox 10 degrees before it gets to the set temp and then it just blows cold air.


Try new air filter.Maybe going off on hi temp limit control ? Short run time.

Jan 05, 2011 | Honeywell TH4210D1005 Heater

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

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

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