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digital honeywell aquastats

Maine Ken
Maine Ken Member Posts: 531
in THE MAIN WALL
Which burner do you have? Riello? Are you backfeeding to B1 in the aquastat??

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  • Bob Bona_4
    Bob Bona_4 Member Posts: 2,083
    anyone else having trouble w/ Honeywell digital aquastats?

    I have installed a handful of boilers w/ tankless coils that have had the new Honeywell digital aquastats (8124A replacement), The first one had me worried when the power indicator light flickers, but all seemed ok.

    Yesterday, emergency boiler install. Buderus G115/34 and a ST200. First cold start aquastat version for me. Problem from the get go was not firing the burner, then the control read the "5" error message-"check L1 and L2". All seemed ok..118V, polarity correct as far as I know. Then, the error message would morph into a 000 readout-no code for that. Argo circ relay, XX terminals are sendng a dry signal to TT on the Honeywell-no backfeed voltage there.

    I finally, at 10 pm, installed the old 8124 off the old boiler and everything is ducky.

    Bad control? Ground issue?
  • burnerman_2
    burnerman_2 Member Posts: 297
    none yet

    we have installed about a dozen no trouble yet but u may have got the first one with a bad relay i know anothe installer had trouble with the new relay on a hot air furnace did the same thing sometimes the technoolgy is to advanced for arw own good if it ain't broke y fix it but then the engineers would be out of work royboy
  • Bob Bona_4
    Bob Bona_4 Member Posts: 2,083
    Carlin

    using factory wiring harness w/ factory plug, other end goes to aquastat. Harness carries Red for constant (NLH), B1 (dedicated spade connector), L2, and ground. Pretty basic.

    I'll try another control and see what happens. Still happens then I think we have a ground issue..maybe:)
  • Al Corelli_2
    Al Corelli_2 Member Posts: 395
    Aquastats

    Bob,
    Be sure the polarity is correct. Had the same problem early on with those controls. You can't trust what you find in those old electrical boxes. I have gotten into the habit of testing hot/neutral every time. You'd be surprised how often they are swapped.

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