CM907 not talking to boiler

[davidgpa2]

My CM907 thermostat has stopped talking to the boiler. I can control the boiler manually.
I have replaced the thermostat and it appears to be OK but still not talking to the boiler. Is it as straightforward as replacing the boiler receiver? Paired transmitter/receivers must use the same frequency, is it possible that these are not?

 

[Dan Robinson]

My CM907 thermostat

replacing the boiler receiver? Paired transmitter/receivers

The 907 doesn't have a receiver.

I can control the boiler manually

??

 

[davidgpa2]

Sorry I did not make this clear. The thermostat is not wired. The receiver has Honeywell on it. When its button is pushed the green light comes on and the boiler starts up. There is no temperature control and the boiler must be switched off manually. If I replace the receiver how do I know the stat and the receiver will be on the same frequency?

 

[snb]

So which model thermostat do you have I'm guessing CM927. Do,you have a red light flashing on the receiver Box?