Question about Air Conditioners

2 Answers

Resetting hi and lo limits on honeywell L7103 h2o heater control

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

Posted by on

2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

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

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 146 Answers

Get a new limit that is 145

Posted on Jan 25, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How to fix this no heat problem

Check fan/limit control on older unit. newer unit check limit switch

Nov 13, 2013 | Honeywell ER150B Air Conditioner

1 Answer


  • Hey, nofarmark91

    Turn the Coleman furnace system switch to the "Off" position on the electric service panel.

  • Locate the manual reset switch near the left side of your furnace blower. Your Coleman furnace has an upper limit switch for manual reset and a lower limit switch for automatic reset.

  • Press the reset button, which you will find in the middle of the limit switch. Use this manual reset button when the furnace burner will not operate. (See Reference 1 pg 4 "The Furnace Controls and their Function/Important" & Reference 4 # 3)

  • Turn the system switch to the "On" position.

  • Good Luck

    Jul 29, 2012 | Coleman Air Conditioners

    1 Answer

    Wondering what the thermo limit should be set to.

    i would contact rheem and give them the model and serial number. I would think that the upper limit would be around 200. I just put in a Goodman (90%) last week and its upper limit was 168

    Jan 07, 2010 | Air Conditioners

    2 Answers

    When I set tstat to call for a/c, compressor outside comes on. Blower on furnace does not. When I manually rotate fan limit switch on furnace wall, blower comes on, blows cold air, and then goes off when...

    blower relay bad or no call from stat on green wire to run fan jump red on stat to green if fan comes on stat bad if no look for fan relay turning the well switch bypasses the relay hope this helps

    May 24, 2009 | Air Conditioners

    1 Answer

    Honeywell T87f 3855 Doesn't Activate Heater

    thats becaue you need more than this zone working like you said about the master/slave this zone is a slave.

    Jan 25, 2009 | Air Conditioners

    1 Answer

    Burnham ledv boiler, honeywell primary control will lockout after 1 or 2 cycles. reset, get the same results. works fine during the summer

    I'm sorry to hear! On mine, another model of Burnham , there's a grey box (approx 4" high by 5" wide) on the front of the boiler. This cover slides off and the control settings are underneath. My manual says low limit must be 20 degrees below high limit else they will lock out each other. I find this to be the case when a maintenance man's "tuned" the settings. My manual also says to set the differential knob to 25 degrees. There are some manuals on the site along with their phone number.

    Nov 11, 2008 | Air Conditioners

    1 Answer

    Have an oil fired boiler for baseboard heat and it also has a tankless heater for domestic hot water. No heat being called for only getting hot water for use. Boiler goes to 210 degrees before it knocks...

    These boilers usually have multiple controls. The control that would take it out of the circuit at 210 degrees is a safety.

    You should definitely have a professional take a look at this unit before you continue using it.

    Sep 18, 2008 | Air Conditioners

    1 Answer

    LOOKING FOR MECHANICAL OR DIGITAL HEAT THERMOSTAT WITH 65 DEGREE MAXIMUM LIMIT OR THERMOSTAT which can be programmed with code to stop tampering and changing temperature above 65 degrees

    HEY< When I worked for a large co. with offices of women of different sizes (yes, that has a lot to do with people changing the thermostat for the correct body temperatures) ,we left the old thermostat in place and called this a '"DUMMY THERMOSTAT" and unhooked the wires and added a new thermostat at the inlet air at the unit out of sight! We asked them how they feel, and as long as they thought they controlled the temperature, they were HAPPY! thank-you-very-much!

    Aug 30, 2008 | Honeywell Air Conditioners

    1 Answer

    I want to adjust the hi and low water temp limits for my oil hot water boiler; I have a Honeywell L7224 aquastat but I cannot find any temperature indicators; how can I do this?

    To enter the adjustment mode, press the UP, DOWN, and I buttons simultaneously for three seconds. Press the I button until the feature requiring adjustment is displayed:
    • HL —High Limit.
    • LL— Low Limit.
    • Ldf —Low Limit differential.
    Then press the UP and/or DOWN buttons to move the set point to
    the desired value. After 60 seconds without any button inputs, the
    control will automatically return to the READ mode.

    (copied from honeywell's instructions)

    to clarify the differential is cut in minus the cut out.
    Hope i can be some help to you.

    Apr 21, 2008 | Air Conditioners

    Not finding what you are looking for?
    Air Conditioners Logo

    Related Topics:

    661 people viewed this question

    Ask a Question

    Usually answered in minutes!

    Top Air Conditioners Experts

    Dan Webster
    Dan Webster

    Level 3 Expert

    8147 Answers

    Bill Long

    Level 3 Expert

    577 Answers

    Tim Whalen

    Level 3 Expert

    3056 Answers

    Are you an Air Conditioner Expert? Answer questions, earn points and help others

    Answer questions

    Manuals & User Guides