Horstmann Programmable Room Thermostat T50 - Programme Issues

[Beccy]

I have a Horstmann Programmable Room Thermostat T50 which works fine for the first programme and the last programme of the day – the lights come on the receiver fine but all the programme settings in-between don’t work – the receiver doesn’t light-up even when the thermostat is near so I have a freezing cold house during the day. I have changed the batteries and re-programmed all the timings during the day but it still won’t work! Has anyone come across this before? Would there be a setting in the receiver that may not have been set?

Any help would be gratefully received as I don’t want to replace the system if I can help it!

Thank you!