When hot water comes on first and heating second there is no power on the CH connection. When CH is on first and Hot water second there is power on HW Off, HW On and CH. This stops the Y plan 3 way valve from going to position AB
If this a honeywell valve you may need to change the motor in side the valve , sounds like its lost some of it power to move the inside of the valve to y postion .
SOURCE: cannot get central heating working,for honeywell ST6400 programme
with y plan 3 connections on programmer HW on HW off CH on HW on to cylinder stat then HW call to Orange on Mvalve to power boiler and pump HW off to grey wire on Mvalve to close hot water CH to room stat common then heating call to white on Mvalve
SOURCE: my daughters honeywell ch/hw digital control resets to zero
have the batteries died have you got the programmer set back to timer control or is it still in the set mode
SOURCE: ravenheat he85aaa combi boiler running fault
sounds like low water pressure, check pressure guage, get unit serviced
SOURCE: My Honeywell 3 port valve in my CH/hot water systemis not working
Hi two things that go wrong inside the valve gets clogged up and blocks up in side, the valve in side and get worn sorry 3 things the motor on the top burns out , if you remove the top cover you will see a small motor with 2 orange wires on it you can remove the motor with 1 screw and see if its turning
SOURCE: Honeywell junction Box and QE2 Programmer
Hi check the wiring to the cylinder stat is there power to it then is it going to the valve
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