Hi All,
My honeywell CMT921 has been showing Room Temperature as 38 degrees since the weekend. Its very odd, just suddenly happened on Saturday at some point. I went to check why the heating wasn't on and saw the room temperature showing as 40 degrees! Its definitely not 40 degrees, and clearly the room temperature will never reach 41 to actually trigger the heating to come on as its about 8 degrees outside!
Has anyone else come across this?
I have tried taking the batteries out and leaving it overnight. It still showed 38 degrees when I switched it back on. I have also tried testing the honeywell with the relay to check its working. The relay and boiler are working fine as we have hot water and can manually switch on the heating with the relay but this is not ideal.
Any help would be much appreciated as it is cold outside!
Why do these things always happen just before Christmas...
My honeywell CMT921 has been showing Room Temperature as 38 degrees since the weekend. Its very odd, just suddenly happened on Saturday at some point. I went to check why the heating wasn't on and saw the room temperature showing as 40 degrees! Its definitely not 40 degrees, and clearly the room temperature will never reach 41 to actually trigger the heating to come on as its about 8 degrees outside!
Has anyone else come across this?
I have tried taking the batteries out and leaving it overnight. It still showed 38 degrees when I switched it back on. I have also tried testing the honeywell with the relay to check its working. The relay and boiler are working fine as we have hot water and can manually switch on the heating with the relay but this is not ideal.
Any help would be much appreciated as it is cold outside!
Why do these things always happen just before Christmas...