Weil McLain help

skweir

Weil McLain 97+110; replaced control board in January had issue with it, since then no problems. Power outage past Friday, no heat since. Board has no power to it or is not reading on panel. Fuse inside 3 amp replaced, nothing. 3 amp and 12 amp replaced nothing. Circuit breaker and fuses replaced no response. Transformer replaced and fuses nothing. Switch and fuses nothing. Checked wiring from thermostat, replaced fuses nothing..

Not sure next step? The control panels are not cheap, any way to see if the panel is bad? I don’t want to buy a new one to have nothing continue to work. Any suggestions would be greatly appreciated.

Alan (California Radiant) Forbes

Someone qualified will need to check the wiring with a meter to see where the roadblock is. See if there's 120 volts to the control module. If yes, is there power at terminals P3-1 and P3-3. If none, you might need a new control module. If yes, then continue following the path and see where it stops.

I'm sorry, I'm not familiar with this boiler, but troubleshooting any boiler involves the use of a meter to find where the issue is.

It could be somewhere in the safety string (low water cutoff, etc.).

skweir

Thank you, yes we used a meter and can see the electric running through in various locations and can see where there is a disconnect. Water levels look accurate just trying to see if we could be missing anything else.

Mustangman

I would start with P1-1 and P1-2. That is line volatage in. Across 1 and 2 you should have 120 volts. Check P1 to ground. Should show 120 also. If you have power, I would start checking the safety items. Limit switches, sensors etc. Some are normally open and some normally closed contacts. Gets a little tricky. If you don't have power on P1-1 and P1-2, go backwards from there. Look for a switch off. ( Here, many years ago, it was code to put a shut off switch at the top of the basement stairs. It was suppose to have a Red switch cover. So many times I have been called out for no heat and found the switch off.
Without being there, its really hard to diagnose the WM97. They are a great boiler. They stopped making them because they were really expensive. They were much easier to pipe than the Ultras and alike.
Good luck.