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The hot water works but my the central heating wont come on?

The bolier works for heathing up the hot water, but the central heating is just not working the pump seems to be running is it the actuator valve?
john johnstone, October 2006
probably the motor in the 3 port valve
b.g engineer

MIKE, October 2006
what boiler is it theres thousands. let me guess ? give up

hi-spec plumbing, October 2006
Can you use a multimeter?
You really need one on something like this to check the outputs from programmer to valves etc.

Paulio, October 2006