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My boiler control is a Honeywell Triple Aquastat L8124A C. The circulator pump does not run when heat is called for. When the thermostat call for heat the relay in the aquastat engages but no pump action. When I hook the pump to a constant hot terminal it runs fine. Are aquastats serviceable or do I replace the whole unit?


  • billtwocase
    billtwocase Member Posts: 2,385

    What are the settings?  Lo limit especially. Do you have power out of  C-1? Good ground? If it is no good, it will need to be replaced, there is no repair
  • Trewfoot
    Trewfoot Member Posts: 3

    High limit 180 - Low limit 140. Ground look tight. I'll check the C1 for power after work today.

    Thanks for the fast response
  • Trewfoot
    Trewfoot Member Posts: 3

    No power at C1 terminal. Recon I'll have to order a new one today.

    Thanks for the help.
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