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Quick one folk, Even with my programmer set to off for both zones and hot water, the boiler seems to fire up every so often to keep something warm. The freeze thermostat is turned right down and both actuators for the zones appear to open and close as requested by the programmer. Any ideas why...

Good morning, I've had a look at a few threads featuring a horstmann H37XL however the wiring on the posts is slightly different in that our box has 2 lives, earths and neutrals. Our central heating is a 2 zone controlled by Drayton ZA5 aculators, oil fired and currently using the horstmann...

Afternoon, First post on here but you all seem like a really helpful bunch, hoping to find the problem with my valve. When called for heating there is no movement in the motor, we put in a new one just incase and still nothing. I've measured the voltage across the points powering the motor...