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OK. Full disclosure time-how I got here. I changed the PCB because I'd been getting intermittent f61 errors and temp display jumping up and down, but generally boiler was working fine. I figured it probably had nothing to do with the gas valve because CH was working ok, just hot water going cold...

Link T3-T4 is there.

Thanks for the reply 831 bunny, it's much appreciated. I hear and respect the note of caution in respect of opening the boiler. Spindles are fine on the knobs. yes, I'm getting s30 when I press the I also the heating comes on when I press - and + together. the PCB is new...apparently...

Hmmm Diverter valve moves when I first power on the boiler but not after that...I’m still thinking it’s the motor-maybe not reporting back to the PCB-but not 100%...anyone wanna chip in with an opinion?

Yep. I took the motor off the diverter valve and the central heating came on. Still reading 100 in d35 and the motor isn’t moving so I’m thinking the motor is shot...

LEDs. I just went into diagnostic d35 (pos of diverter valve.) It’s staying at 100 (hot water) even after I turn off the tap...should it change to 0 (hot water)? Don’t want to jump to conclusions...but I’m thinking what else could it be?

Morning folks...calling all Vaillant combi experts! I’ve got no CH. Hot water is ok. No error code. Just like it’s switched off. Boiler has the panel mounted timer switch option. No stat. I took off the timer switch to see if that was the culprit-ch should default to ‘on’ if I remove this...