My CH is controlled by a Honeywell CM927 Wireless Optimizing Programmer. So far it has worked "as it says on the tin" and the house temperature hardly varies.
The first ON time is 0630hrs temperature 20C. The last time is 2230hrs temperature 5C. We usually get up between 0630 and 0645 and the house is comfortable.
This morning the wife got up at 0615 as she could not sleep and went downstairs. Minutes later she came back and said that the heating was not on and the house was freezing.
I felt the bedroom rad and it was cold so I went and looked at the programmer. It showed a Room temperature of 19C while the target temperature was 5C. I turned the temperature up until the target was 21C and the boiler came on.
As far as I understand it with optimizing controls the boiler should have come on in time to bring the temperature up to 20C by 0630, but it didn't.
I checked that the optimization facility was turned on, and it was.
Has any one come across this before or have an explanation?
Also can anyone explain what the "proportional bandwidth" setting is for and when to change it?
Lastly, there is a temperature offset for cases when the programmer is in a warmer/hotter location. Which way do you adjust it? e.g if the location is in the kitchen, which is always 2C warmer than the rest of the house, do you set the Offset to +2 or -2?
The first ON time is 0630hrs temperature 20C. The last time is 2230hrs temperature 5C. We usually get up between 0630 and 0645 and the house is comfortable.
This morning the wife got up at 0615 as she could not sleep and went downstairs. Minutes later she came back and said that the heating was not on and the house was freezing.
I felt the bedroom rad and it was cold so I went and looked at the programmer. It showed a Room temperature of 19C while the target temperature was 5C. I turned the temperature up until the target was 21C and the boiler came on.
As far as I understand it with optimizing controls the boiler should have come on in time to bring the temperature up to 20C by 0630, but it didn't.
I checked that the optimization facility was turned on, and it was.
Has any one come across this before or have an explanation?
Also can anyone explain what the "proportional bandwidth" setting is for and when to change it?
Lastly, there is a temperature offset for cases when the programmer is in a warmer/hotter location. Which way do you adjust it? e.g if the location is in the kitchen, which is always 2C warmer than the rest of the house, do you set the Offset to +2 or -2?