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Thread: L8418A Honeywell Aquastat

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  1. #1

    Default L8418A Honeywell Aquastat

    The aquastat on my boiler has been malfunctioning. Sometimes it works on its own, sometimes I have to help it along. I can get it to work if I press on the square metal piece attached to the small spring. It appears that the contacts on the electromagnetic relay on the aquastat do not line up properly. Is there any way to adjust the relay so that it works more reliably, possibly adjusting the length of the spring or bending in the frame of the relay a bit? It is an L8418A 1009 and I have been told that it has been replaced by an L8418A 1017. Thanks for any advice.

  2. #2
    Master Plumber nhmaster's Avatar
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    Nope, no adjustments can be made here. The problem is with the relay and it sounds like it's a few hrs. away from heading south. Replace the control.

  3. #3

    Default Honeywell L8148 A 1009 Parts

    Any idea who sells parts so I can rebuild the Honeywell L8148 A 1009? I replaced it with the L8148A 1017 and was hoping to repair this one to have as a back-up. I am trying to find a supplier of the electromagnetic relay,
    Part Number 131630MZMS 17.

  4. #4
    Master Plumber nhmaster's Avatar
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    I doubt that you can repair it and even if you found a source for the relay it would probably cost more than the whole control. Sid Harvy's will take it and give you a core charge though.

  5. #5
    DIY Junior Member b_randolph's Avatar
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    Default Same Issue

    Quote Originally Posted by robertjulius View Post
    Any idea who sells parts so I can rebuild the Honeywell L8148 A 1009? I replaced it with the L8148A 1017 and was hoping to repair this one to have as a back-up. I am trying to find a supplier of the electromagnetic relay,
    Part Number 131630MZMS 17.
    Hey Man, did you get any viable solution for the above issue, as I had the same issue with my furnace, your help will be much appriciated. (see1ce at yahooo doot coom)

    Ths

  6. #6
    DIY Junior Member cormit's Avatar
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    I too suspect I have an issue with a Honeywell L8148A 1009.
    Question is this: When thermostat closes the circuit (calls for heat) .... should the circulator terminals C1 & C2 become instantly energized, or must the boiler come up to temperature first before the circulator will energize?

  7. #7
    Retired Defense Industry Engineer jadnashua's Avatar
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    Some do, some don't...your operations manual should tell you. It's important that the circulator comes on before the water gets too hot in the boiler, but it doesn't need to come on immediately. The logic may wait until it's sure the boiler fired or the temp starts to rise. And, it often works out more efficiently if it continues to run after the boiler turns off to purge the heat you paid for. If the boiler temp is already warm, the circulator may turn on immediately, when it is cold like from a long off period, it might not. Depends on how the acquastat is wired in the control circuitry.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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