Errors

Boiler type WHN110

Error code Flow switch/LWCO

Cause:

1. Either the optional flow switch or the optional low water cutoff is not making.
2. Blown fuse.

Solution:

1. - Check boiler pump operation on a call for heat.
- Check for closed valves or obstructions in the boiler piping.
- Verify system is full of water and all air has been purged from the system.
- Check for loose or misplaced jumpers if flow switch or LWCO is not installed on the Low Voltage Connection Board.

2. Replace fuse F3 on the control board.