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Thanks for the reply
I cleaned the gunk out yesterday and refitted it.
With wiring disconnected
-Test for continuity acros switch terminals = OC
-start to repressurise system at 0.5 bar = switch closes
-depressurise system below 0.5 bar = switch opens = OC
reconnect wiring
system...
Paul Barker have a reply that interested me but I dont know if he still uses the forum--
I am a retired Corgi fitter (Knees gave out) My son has a Worcester 281 and I have located the fault to no continuity across the water pressure switch
Paul indicated it can be cleaned out--anyone have...