Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Weil McLain mgb9 commercial hot water boiler

hdwe87
hdwe87 Member Posts: 2
in Thermostats and Controls
This boiler is used to heat a 4 story apartment building. Up until a few. Years ago,boiler worked great. Now in fall and spring, when days are warm and nighttime its cold. Boiler won't stay running without hitting reset button. If the weather is continually cold, it running great no problem. I've replaced controls, first stage gas valve, thermocouple to standing pilot. Still the same result. Anybody experience this?

Comments

  • Abracadabra
    Abracadabra Member Posts: 1,948
    What reset button are you taking about? The only "reset" I can think of that boiler would have is a manual reset on a pressuretrol. Is that it?
  • Robert O'Connor_12
    Robert O'Connor_12 Member Posts: 728
    An LGB has a reset button on transformer. Is this the one you're pressing?

    Robert O'Connor/NJ
  • hdwe87
    hdwe87 Member Posts: 2
    No there is a reset right on the control module
  • Robert O'Connor_12
    Robert O'Connor_12 Member Posts: 728
    Is this propane ?
    I know propane LGB's that use pilot switch which the reset must be depressed while you light pilot, then wait for thermocouple to maintain pilot flame.
    Maybe post a picture of what you've been resetting.

    Robert O'Connor/NJ
  • Abracadabra
    Abracadabra Member Posts: 1,948
    Robert O'Connor said:

    An LGB has a reset button on transformer. Is this the one you're pressing?

    Robert O'Connor/NJ

    None of the LGB's I have ever installed had a reset button on the included transformer. MGBs had a standing pilot, no ignition control. Unless someone modified the gas train with something else.

    Pics please.
  • EGR
    EGR Member Posts: 1
    The MGB9 I'm working on has a similar issue. It seems to work fine until doesn't have to cycle normally in cold weather. It seems to take several attempts before it stops alarming out. I'm wondering if it is the photo eye not sensing that the burners are on. Ours will light OK, but after several seconds the burners will go out and the alarm sounds.

Categories