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Old 03-08-2013, 09:06 AM   #1
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Can't lower temperature of Honeywell L4103A 1019


I'm having trouble lowering the temperature on my Honeywell L4103A 1019 Aquastat. I've seen this same question posted on other forums, but the answer references an arrow that I'm not seeing on mine. It's pretty beat-up, so I'm not sure if it is missing, or I just don't know what they mean.

In addition, my dial is faded and all I can see on it are the words: 'Warm', 'Norm.' and 'Hot' and then the number '180'. There is a tab on the dial (I assume for turning it), a lever that is attached behind the dial that moves, and a another stationary piece of metal that is slightly creased in the middle that prohibits both the dial (because of the tab) and the lever from rotating 360 degrees.

Attached is a picture showing how it is currently set. Basically, I want the max temp to be down around 110 degrees and right now it is much hotter.

Thanks.
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Old 03-08-2013, 09:54 AM   #2
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Can't lower temperature of Honeywell L4103A 1019


Quote:
Attached is a picture showing how it is currently set. Basically, I want the max temp to be down around 110 degrees and right now it is much hotter.
Ayuh,.... Turn the dial clockwise til it stops, 'n it's set as cold as it's gonna get...

What kinda heatin' system ya got, that'll work with such cold water,..??

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Old 03-08-2013, 11:04 AM   #3
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Can't lower temperature of Honeywell L4103A 1019


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Ayuh,.... Turn the dial clockwise til it stops, 'n it's set as cold as it's gonna get...

What kinda heatin' system ya got, that'll work with such cold water,..??
Okay, thanks. But what is the little lever that rotates counter-clockwise (#2) used for? Obviously its placement dictates how far you can turn the dial clockwise, which is confusing to me. And why does the dial list both warm/normal/hot as well as what appears to be actual temperatures?

It's for a TFI Therma-Flow Everhot Water Heater. Thanks for the help.
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Old 03-08-2013, 09:58 PM   #4
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Can't lower temperature of Honeywell L4103A 1019


Try this link, it explains your numbers 1,2,and 3 a little better, which I believe are setpoints and stop, plus you can see all the numbers.

link here

Last edited by jmon; 03-08-2013 at 10:17 PM.
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Old 03-08-2013, 10:06 PM   #5
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Can't lower temperature of Honeywell L4103A 1019


If it turns out to be bad, pexsupply has them for about 205.00 dollars, amazon wants 260.00, and grainger wants 323.00. check out link.

link here

Last edited by jmon; 03-08-2013 at 10:24 PM.
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Old 03-08-2013, 10:23 PM   #6
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Can't lower temperature of Honeywell L4103A 1019


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Try this link, it explains your numbers 1,2,and 3 a little better, which I believe are setpoints and stop, plus you can see all the numbers.

link here

Thanks for the reply. I had actually come across that PDF prior to posting, but because I am not all that familiar with the terminology and the controller in the diagram is slightly different than mine, I still didn't full understand how to set it. But here's what I got from the document:
  • Factory-set setpoint - temperature set at factory, cannot be changed
  • Adjustable temperature setting scale (also referred to as a setpoint) - the temperature at which I would like the burner to shut off.

So, the document says to "set the scale to the desired control point". But it doesn't say how to do that. All that is labeled in the diagram is the "setpoint scale". Am I supposed to rotate the dial so that the temp I want is in line with #3 in my photo above? What does the other rotating lever (#2) do? And again, why does the dial list both warm/normal/hot as well as what appears to be actual temperatures? Which do I use for the setpoint scale?

Thanks again for the help, I appreciate it.
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Old 03-08-2013, 10:31 PM   #7
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Can't lower temperature of Honeywell L4103A 1019


awf1130,
If I were you, I would also post this on the hvac forum as well. There are some excellent professionals on that forum who could better help you. They helped me out many times with my old boiler. I'm sure they could figure it out.
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Old 03-08-2013, 10:33 PM   #8
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Can't lower temperature of Honeywell L4103A 1019


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awf1130,
If I were you, I would also post this on the hvac forum as well. There are some excellent professionals on that forum who could better help you. They helped me out many times with my old boiler.
Will do, thanks for the tip.
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Old 03-08-2013, 10:36 PM   #9
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Can't lower temperature of Honeywell L4103A 1019


It looks like the newer ones differ from yours a little. It's the same model number, but looks a little different than your current photo. I'll keep trying my search engine. About how old do you think it is?
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Old 03-08-2013, 10:44 PM   #10
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Can't lower temperature of Honeywell L4103A 1019


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It looks like the newer ones differ from yours a little. It's the same model number, but looks a little different than your current photo. I'll keep trying my search engine. About how old do you think it is?
It was here when we purchased the house in 2005, but the inspector listed it as approximately 4 years old at that time. So I'd say probably from around 2000-2001.
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Old 03-08-2013, 10:54 PM   #11
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Can't lower temperature of Honeywell L4103A 1019


roger that. Try this link they talk about setting the 4103.



link here
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Old 03-08-2013, 11:00 PM   #12
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Can't lower temperature of Honeywell L4103A 1019


That link explains that once you set it, it has to go through a couple of cycles before it will take. It's funny, the 2 control knobs are actually the reverse of what you are trying to accomplish.
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Old 03-08-2013, 11:13 PM   #13
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Can't lower temperature of Honeywell L4103A 1019


Also you can call honeywell directly and tell them the problem you are having. They are a very reputable company. I'm sure their tech department could talk you through it. Maybe they are open saturdays, if not, you'll have to wait till monday. Check out honeywell.com
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Old 03-09-2013, 08:44 AM   #14
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Can't lower temperature of Honeywell L4103A 1019


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Originally Posted by jmon View Post
Also you can call honeywell directly and tell them the problem you are having. They are a very reputable company. I'm sure their tech department could talk you through it. Maybe they are open saturdays, if not, you'll have to wait till monday. Check out honeywell.com
Jmon,

Thanks for all the help. I think I've got it figured out from what you provided, but just in case, I'll post over on the HVAC forum to see if I can get some extra clarification on the dial markings and rotating lever. If all else fails, I'll try and give Honeywell a call.

Appreciate your help!
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Old 03-09-2013, 09:02 AM   #15
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Can't lower temperature of Honeywell L4103A 1019


Your welcome. Glad it worked out for you.

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