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I have a Honeywell Ra832A aquastat that will open up when I tap it. It will then circulate water for about a day until I tap it again. As you can tell by this post don't know much about this, any ideas.


  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 3,197
    #1. This is not an aquastat.
    #2. The control is probably getting stuck intermittently or the electrical contacts on the relay are pitted and not making a good electrical connection. The percussion of tapping then moves the relay clapper or contacts to a position of better electrical contact to complete the circuit
    #3 They are inexpensive enough to just replace it
    #4 If you are not comfortable with electrical control wiring and the safe practices needed to properly replace the control, then call a professional plumber or heating contractor to do the work.
    Edward Young
    Retired HVAC Contractor from So. Jersey.
    Services first oil burner at age 16
    P/T trainer for EH-CC.org
    HVACNUT Member Posts: 4,593
    The Taco SR501 is a good replacement for the RA832A. Pick one up, post back with some pics and we'll help you wire it if needed.