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Firebird Combi 90 Limit Stat issue

  • 08-01-2019 5:42pm
    #1
    FishD
    Registered Users, Registered Users 2 Posts: 35 ✭


    Hi all, I hope someone can advise me.
    The limit stat is coming on after maybe 10 mins or so of the DHW heating. If i'm drawing off the hot water, it does not come on. cold pressure is 1.4, normal heating is 1.8, and limit stat comes on at 2.1bar. I have changed the DHW pump, but the issue remains.

    From the wiring diagram it looks like possible culprits are the Relay Tank stat, the flow switch, or the early alert stat, as only these affect the burner during the HW state (apart from the solenoid which would cut off the burner in the HW state). A couple of questions you might help me with to diagnose the issue.

    1. The relay tank stat, where is the probe fitted, and what temp does is open at.

    2. The Early alert stat, where is the probe fited, and what temp does it open at.

    3. What temp does the limit stat fire, and where is it fitted.


    Thanks in advance for any advice.

    Office2019%20005.PNG


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