To Next PageTo Next PageWhat to do if the pilot lights but the main valve won't come on in my Weil-McLain 4 Series?
If the pilot lights on your Weil-McLain boiler, but the main valve won't come on, you may need to replace the ignition control, pilot assembly, or gas valve. Ensure the pilot valve connections are correct. If the gas pressure is incorrect, contact your gas supplier to correct it.
What to do if my Weil-McLain 4 Series Boiler does not work with a vent damper?
If your Weil-McLain boiler isn't working with a vent damper, make sure all wire connections are secure and check the transformer relay. Also, inspect for an open thermostat or circulator relay, loose wiring, a defective spill switch, a tripped rollout thermal fuse, or open LWCO or high limit contacts. If problems persist, consider replacing the actuator, pilot assembly, or ignition control. You can also try removing the damper harness from the boiler wiring harness.
Why is there no spark in my Weil-McLain 4 Series Boiler system without a vent damper?
If your Weil-McLain boiler system isn't working and there's no spark without a vent damper, check for open thermostat or circulator relay, loose wire connections, a defective spill switch, a rollout thermal fuse element, or open LWCO or limit contacts. Also, ensure all connections are securely fastened. If issues persist, consider replacing the damper plug, pilot assembly, or ignition control. Remember to turn OFF the supply voltage before securing any connections, then turn it back ON to re-test.
How to fix a Weil-McLain 4 Series Boiler vent damper failure?
If the vent damper on your Weil-McLain boiler fails, move the damper service switch to the 'Hold Damper Open' position and apply a call for heat to the boiler. The damper blade should rotate open, and the boiler should fire. If this doesn't work, manually rotate the damper blade to the open position using a wrench or pliers. Note: Do not leave the vent damper permanently in this position; replace the actuator immediately to maintain boiler efficiency. First, turn off the power to the boiler, then turn it back on. You can manually rotate the damper blade until the green light turns on. Refer to the vent damper manufacturer’s instructions for procedure to fix vent damper in open position.
What to do if the inlet gas pressure is incorrect on my Weil-McLain Boiler?
If the inlet gas pressure is not at least 5.0” w.c. and no more than 14.0” w.c. for your Weil-McLain boiler, contact your gas supplier to correct the gas pressure.
What to do if the spark gap is not correct on my Weil-McLain 4 Series Boiler?
If the spark gap is not 0.125” and located in the pilot gas stream of your Weil-McLain boiler, replace the pilot assembly.
General| Model | 4 Series |
|---|---|
| Manufacturer | Weil-McLain |
| Category | Boiler |
| Fuel Type | Natural Gas or Propane |
| Heat Exchanger Material | Cast Iron |
| Vent Type | Atmospheric |
| Ignition Type | Standing Pilot |
| Water Content | Varies by model (Consult product literature) |
| Weight | Varies by model (Consult product literature) |
| Dimensions (H x W x D) | Varies by model (Consult product literature) |
| Vent Diameter | Varies by model (Consult product literature) |
| Boiler Type | Water Boiler |
