SylvanLMP
If this boiler a steam set up where the “pump” is a condensate return system?
The grinding could be a defect impeller or sediment build up and the boiler going off then firing up again sometimes is a low water cut of doing its job.
As the water level drops the probe senses it and cuts off the main flame then as the water lever risers to a safe level the burner again fires up.
Either way have someone pull apart the pump and examine it for a worn or blocked impeller.
SylvanLMP
» This message has been edited by SylvanLMP on 21 September 2001
