3 Mar 2009
Reaction score
West Midlands
United Kingdom
i need help, i have honywell cmt921 wireless programmer, which has suddenly stopped to trun my heating on, on the relay which is fitted close to the boiler the red light is flashing on and off, if i press the button on the relay and keep it pressed the heating comes on and also the green light, if i press the button again the heating turns off and the red light keeps on flashing, the cmt921 wireless programmer dont seems to be controling the heating. please help.
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Hard wire comes to mind , NEVER would i fit wireless controls , complete & utter lazy way out.
sounds like you have lost the RF signal.
try the thermostat next to the main unit.

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