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New primary control does not shutdown boiler

Rob48xx Member Posts: 21
edited March 2020 in Oil Heating
I posted this previously under new boiler but didnt want to confuse or complicate a previous post. I replaced the primary control unit that seemed to be faulty. The new unit is the Honeywell R8184G4009 which is the only one i can find right now especially with everything on lock down.

I have a aquastat control and wheni replace rhe primary control and fire everything up the boiler never shuts down almost like its not being told too and keep heating well above rhe high limit. When i turn down the hi limit manually it shuts off but that is the only time. I jumped the TT since the tstats terminate to the aquastat, though the old unit didnt need this. I get the sense i am missing an installation step somewhere.

Any ideas


    HVACNUT Member Posts: 4,597
    Well it's not the primary. The old one didn't have TT terminals. It was internal with intermittent (constant) ignition.

    What model aquastat do you have?
  • BDR529
    BDR529 Member Posts: 217
    Did you verify B1 from aqustat goes to the black wire on the 8184 with a tester? If you got a molex connector don't rely on color of the wire, test it to make sure it getting the correct signal from the aqustat.
  • Rob48xx
    Rob48xx Member Posts: 21
    Will take a look to confirm again the cabling