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I had an Ideal Logic15 boiler installed less than a year ago. It has DT92 wireless room thermostat and a Honeywell ST9400C programmer and it was all working ok until recently. The hot water is working fine but the central heating is not working at all. When the hot water is set to off on the...

Hi I have an Ideal Logic 15 boiler installed last November. Programmer is ST9400C and wireless thermostat Honeywell DT92E. System was all working ok until  recently . Now the water is heating up ok but the central heating is not working at all. If I switch the water to off on the programmer and...

Problem now resolved. The installer came back with the correct wiring diagram and removed the offending link in the thermostat wiring box. Thanks for all your help and advice.

Thankyou all for your input. I will get the installer to have another look at it and pass your comments on to him.

Thanks. Is it likely to be the wiring in the thermostat relay box or  in the programmer which is wired incorrectly? 

I have just had my old boiler replaced with an Ideal logic Heat15. I have a hot water storage tank and  the programmer is a Honeywell ST9400C. I also have a Honeywell DT92E wireless thermostat . The problem is that the programmer switches the water on and off ok but I can only activate the...