Keston Combi C30 - No CH Operation but DHW Works OK

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FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING
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Installation and Servicing
SECTION 4 - FAULT FINDING
A
Is the mode knob in the Winter position?
YES
NO
Move the mode knob to the Winter position
Are the Timer and the Room Thermostat switched
on?
YES
NO
Switch the Timer and Room Thermostat On
Are the Radiator Valves Open?
YES
NO
Open the Radiator Valves
Is there 230Vac at (A)?
YES
NO
There is no Voltage from the Timer/Room Stat. This
is not boiler fault. Ensure Voltage is supplied to
boiler by rectifying external wiring.
Replace the Divertor Valve
4.11 NO CH OPERATION BUT DHW WORKS OK