Thanks for reply. Got 2 seperate manifolds fed via worcester heat pump, fuse blew on upstairs manifold board. replaced fuse and blew instantly, checked wiring in zone valve & removed pump & vonevalve wires = fuse ok. reconnect zonevalve & fuse fine, then pump and still fine so never found a reason. 6 weeks later fuse on other master has blown and theres no connection wires between upstairs and downstairs masters ?
Thanks for reply. Got 2 seperate manifolds fed via worcester heat pump, fuse blew on upstairs manifold board. replaced fuse and blew instantly, checked wiring in zone valve & removed pump & vonevalve wires = fuse ok. reconnect zonevalve & fuse fine, then pump and still fine so never found a reason. 6 weeks later fuse on other master has blown and theres no connection wires between upstairs and downstairs masters ?
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