The Christmas Eve C/H failure curse nearly visited. H/W on all the time, no C/H.
Quick poke about reveals it to be with the 3 way valve, and if anything goes wrong there, one must always assume its the synchronous motor*. This one had seized.
Quick check at screw fix reveals they have the head unit, so off I pops. Hour later we have it working. Two hours later we have it working properly. (well it was dark in the cupboard and drab white and grey wires look very similar)
Phew that was easy, no system draining.
*Of all the appalling engineering choices foisted not he general public, the "drive the synchronous motor till it stalls" C/H valve is one of the most stupid. It will fail, guaranteed, its just a matter of time.
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