plenty of hot water but no heating

[ABB117]

My hot water system is working fine but the heating fails to fire up. Selecting the heating manualy on the control panel illuminates the LED, puts power to the thermostat (which switches fine) but I do not get any power at the terminal marked 'boiler' in the distribution box; power present when HW turned on.
I have selected the different motor speeds and it changes each time but I cannot get the heating to fire up.
Would this fault be caused by a wiring fault on the control panel (Honeywell ST7100 - not been moved at all) or could I be looking at a micro switch problem in a valve/motor?
It appears that the system is an 'S' plan as I have found x2 zone valves during my investigation.

 

[Agile]

Timeclock ???

Thermostat ???

Motor valve ???

Tony

 

[NEALDEAN]

Check the heating valve wiring.
Make sure when you call for heat the Brown, grey and orange wires are live.

If not then the valve is goosed !!!!!

 

[Agile]

If not then the valve is goosed !!!!!

This is a Canada Goose!

Honeywell valves are made in Canada!

 

[NEALDEAN]

Haha. Thanks for that !!!!!

You been at the wine gums again ?

 

[ABB117]

Nealdean - spot on fault diagnosis method with the power checks for the heating valve you got it in one - thanks a lot.

 

[NEALDEAN]

Be a love and press the thanks button

Your welcome