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My Honeywell L4103 Aquastat & High Limit Controller for my oil-fired hot water tank won't set the temperature no matter which direction the setpoint scale is turned. Instead it cuts off via the high limit controller at around 140ºF which is too hot. I would like to set it to 120ºF. Can this be repaired or do I have to replace the entire controller? rjs@goodread.com

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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refritech08
  • 149 Answers

SOURCE: I want to adjust the

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.

Posted on Apr 21, 2008

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  • 15 Answers

SOURCE: have an oil fired boiler

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.

Posted on Sep 18, 2008

  • 234 Answers

SOURCE: what would the correct high and lo and diff

I would say high if you need cooling. If the tempature is cool enough for you then set it to low.If you are hot and need more cooling then high.

Posted on Apr 07, 2009

Therinnaiguy
  • 1420 Answers

SOURCE: what is the recomented settings for high and low

180 with a differential of 15 or 20. So 180 high and 160-165 on low.

Posted on Nov 03, 2009

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  • 949 Answers

SOURCE: HI IAM A ELECTRICIAN WORKING

I would suspect a water circulation problem, most likely air in the system, if the water can't flow it will overheat.

If the problem persists after bleeding check to make sure the pump is running

Posted on May 06, 2010

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1 Answer

Is it possible to lower the top temperature on the thermostate. I can change the lower temp but not the max which I wish to set below the 180 level. Thanks


there is a high and a low limit on these units, the two control knobs are actually the reverse of what you are trying to accomblish,first lower the bottom or low cut off temp first then the high temp ,it must cycle a couple times for it to adjust

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My L4103 aquastat is set too hot, it does not clearly stat temps on set dial which way do i turn it to lesson temp


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1 Answer

My john wood hot water tank over flows through the relief valve every 3 - 6 months. The hot water is too hot and I can't seem to adjust the Aquastat L4103 on the hot water heater to a good temperature....


There should be plate on the front of the hot water heater tank.. Pop that off..
There might be some insilation to move and you should see a set screw for adjusting the temp..
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Hope this helps !I
rate me good ;o)

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1 Answer

What would the correct high and lo and diff settings for the Honeywell L8124A Aquastat I have a wood fired boiler with the oil fired boiler side by sides,


I would say high if you need cooling. If the tempature is cool enough for you then set it to low.If you are hot and need more cooling then high.

Apr 05, 2009 | Honeywell Heating & Cooling

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 | Heating & Cooling

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