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Discuss Honeywell 2 port motorised valve screeches when shutting off in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Hi all, I have a 2 port motorised valve that screeches when CH shuts off, this has been ok for 6 months. System is a combo boiler operating 2 zones CH & underfloor heating with a safety PR valve. Both valves plumbed correct flow direction, is this classic water hammer from a defective ball/plate or head? All help appreciated. Thanks
 
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king of pipes

Esteemed
Plumber
Gas Engineer
Advent Win
Any pictures please ? Is there a auto bypass fitted before the zone valves it sounds like it will need replacing. Kop
 

king of pipes

Esteemed
Plumber
Gas Engineer
Advent Win
Looks ok there check the operation of the small spindle where the power head connects it should move freely by hand and try firing the boiler with the power head removed to check it opens and closes . Kop
 

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