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no need to get nasty is there !!! i;ll fix it up in 10, no rush!!!

so why did you say the original post was not right ..... :shock:

sorry yes of course. :oops: some diverter valves use the venturi type diverter valve and some a wax capsule, but i believe the diaphragm type is the most popular.

it's a 2port valve (s plan) system, the c 1 and 2 are only used on the cylinder stat for a 3 port mid ( y plan) !

or a faulty / stuck pump possibly

seems odd, a combi doesn't provide both HW and HTG together, it is HW priority!!

i know it's not complicated, but from the drawing it doesn't look or seem like it can work right. The power from the HW on at the programmer goes to 1, correct?? and the switch is connected to the C (which then connects to the motor of the 2 port) correct? so when power is supplied from...

just looking at it again - if the c and 1 were reversed and or the switch going from the c to the 1 then it would make more sense ... as power goes to 1 and the switch is attached to c, so it looks like the switch will have to be sucked into the 1 for the motor of the mv (brown wire) to get any...

i understand how it works, it's just if the diagram had been like this: c for the common and 1 the call, and the switch going in the other direction, it'd look clearer... it seems a little strange the way it is drawn!! no c is not common, as the power from HW on is going to terminal 1 on...

thanks for clearing thast up, i just wanted to be sure, and i was thinking the same. but the diagram (honeywell) isn't v clear is it!! it looks like the switch needs to be sucked back to make contact!! it ahould be the other way round for people to understand better!!! the sat terminal on...

I am a little puzzled by the S PLAN wiring diagram (as from Honeywell). It, unlike the 3 port mid position type, doesn't make 100% sense!! The cylinder stat 1 terminal is apparently supplied from the HW on at the programmer, and when under temp (60) is should make and put power on to the...