I have a Tempus 6 (B&Q) programmer which is refusing to turn on the
central heating on without the hot water in the evening.

In the morning it works fine.

I have checked the room thermostat which appears to be working ok.

The programmer is just 2 years old.

The 3 way motorised valve is only 1 month old.

Is there a reset button or is the programmer fininshed?

Any suggestions?