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.

SR 504 exp 4 zone switching relay

Toptree19 Member Posts: 1
I have base board heating and a gas boiler. The base boards are getting warm, but not warm enough to actual give off much heat. So I went down to the boiler to try and find a problem, the boiler is on, but the relay switch has both green (power) and red lights (all 3 zones). I am just trying to find out if these lights are supposed to be red or not, and if not what could be the cause. Thank you very much in advance.


  • unclejohn
    unclejohn Member Posts: 1,833

    Green light normally means the vavle is powered and the red normally means it's fully open. Is the pump running?
  • Ironman
    Ironman Member Posts: 7,376

    That's a pump control panel, not a zone valve panel. The green light means there's power to the panel and the red light indicates that zone is calling for heat.

    I doubt your problem is control related unless the aquastat is bad. I'd look on the hydronic side if the boilers getting hot. Air bound? Bad circ?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.