B
buckley plumb
called to a job today no htg or hw. find fuse in board blown and 13amp fuse in spur.trace to pump fault - replace pump with a rated all merchants now stock at £110 . all good but notice with programmer off the boiler and pump on running through bypass. remove htg on wire from junction box and its live find pump failing has welded contact in programmer closed . call sparky as I have busy day and call back later to see him . we replace programmer and still the same so I exchange for another programmer and now it works on htg but hw on wire is live with programmer off . we remove orange and white wires from junction box to zone valve and switch back on to find zone valve powers to htg position now we are puzzled.i get new Honeywell head and fit and now htg works fine and room stat but now hw on wire is constantly live . we put hw on zone valve stays in hw only , then I put htg on and zone valve moves to mid position then I turn cyl stat down and zone valve moves fully to htg only so its working as it should but turn htg and hw off and hw on wire is still live until hw is satisfied . sparky puzzled now and leave at that for now are there any sparkys that can shed some light this job has stressed me out.thanks ant