Siemens rdj10rf thermastat part working?

I have a problem with the reciever if anyone can help.

The thermostat and receiver talk to each other and are synced.

If I turn the thermostat up it fires the boiler no problem, if the temp drops below the day and night settings it fires the boiler.

My issue is with the timer settings - the 1,2,3,4 timers are not firing the boiler? Has anyone had and solved this problem??

The thermastate is set to Auto and Run so it should work?

Thanks for any help supplied.

Richard