Thermostat behaving abnormally

[CCANON]

Hi

When I go to bed I manually set my thermostat to 17.5 so the temperature never falls below and when we wake up it is not too cold.

However, recently in the morning the temperature is actually BELOW what i set.

There is not an 'auto' programme set on there either.

Example:
When waking up the temp is 16.

But, I had set it to 17.5, as can be seen when i press the 'i' button.

Thanks

 

[John.g]

It looks like a Flame On or demand signal on the top of the display??, can you confirm this and check the boiler status, ie running/stopped.

 

[CCANON]

It looks like a Flame On or demand signal on the top of the display??, can you confirm this and check the boiler status, ie running/stopped.

The flame is 'burner on indicator'... so this means it is working fine, i assume

https://www.mepstock.co.uk/admin/images/CM707%20User%20Guide.pdf

 

[John.g]

IF the burner is firing and the actual room temp is 16C with 17.5 SP then it must have just come on and the controller has a hysteresis of 1.5C, (17.5-16.0), its also possible that the boiler isn't actually firing even though the controller is demanding it so I would keep a eye on both the demand signal and the actal status of the boiler by actuall looking at it.

You say there is no Auto (or Off) setting, its not quite clear but looks something like it near where your finger is, it certainly shows it in the MIs that you posted.

 

[CCANON]

"its also possible that the boiler isn't actually firing even though the controller is demanding it so I would keep a eye on both the demand signal and the actal status of the boiler by actuall looking at it." - will keep an eye on that, thanks.

Sorry, i meant i havent set the 'auto' to come on. I always use it on 'manual'; and so i trust it to do what i ask!