Central Heating Not Kicking in at night

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Sherwood93

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Hi All,

Having a couple of issues with the central heating which I want to clear up before the temperatures drop.

I run the CH via a thermostat. It’s set for 18.5 degrees and in the day it runs absolutely fine, if it drops below, the flame symbol comes on on the thermostat and the boiler fires up etc.

However at night I’ve noticed when ever I go downstairs between 12am-6am that the thermostat will be on say 16-17 degrees, and the flame symbol will be on the thermostat, however the boiler hasn’t kicked in and the Rads haven’t come on.

Would appreciate any guidance!

Cheers,
 
is there a program timer for the boiler , which may be on settign twice , and OFF at night - so the boiler cannot come on ?

not tested , BUT i have just had a new wireless thermostat for a new boiler - we have a timer control , which can be set to always on, once , twice, off . and i would expect regardless of what the thermostat stated the timer would control if the boiler was able to light or not

in a previous house the program timer and thermostat were both in the same wireless unit
 
So my boiler programmer has 4 settings

ON - goes off the thermostat
Auto - Set Times and temperature
24 Hour - Stays On at set temp
OFF

I’m using ON, which connects to the wired thermostat. As mentioned, in the day it’s absolute fine, it’s just at night it won’t kick in, despite the thermostat having the flame symbol meaning it’s calling for heat.
 
they should all be controlled by the themostate
24hours will be on all the time with the thermostat controlling

can you post a picture of the controller

not sure what the difference between on and 24 is - do you set a temperature on the 24hr
 
So 24 hours keeps the hearing on at all times going off the temperature that the boiler is set to. It will literally just stay on the whole time.

ON will fire the boiler up going off the temperature of the thermostat. So if it drops below the thermostat temp it will fire up the heating
 
ok, no idea then , as, only had 1 house , where the timer for the boiler - and NO themostat in house , so boiler sets temp
and in all other houses the thermostat in the room always controlled the boiler , with various different types of programmer to control when

Dereekoo​

suggests - change the clock time by 12hours
 
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image.jpg
 
You don’t have it set to “on”, as there isn’t one. You have it on all day, which as per instructions operates from 1st on until 3rd off. Info you want it on constantly and use the thermostat you need to set to 24 hours. The thermostat doesn’t override the programmer, it operates when the programmer requests heating.
 
CBW said:
You don’t have it set to “on”, as there isn’t one. You have it on all day, which as per instructions operates from 1st on until 3rd off. Info you want it on constantly and use the thermostat you need to set to 24 hours. The thermostat doesn’t override the programmer, it operates when the programmer requests heating.
Click to expand...
Thanks for the reply, appreciate you trying to help. I believe auto operates from 1st on until 3rd off. All day, is done of the thermostat depending on when the temp drops, which is what is happening during the day I.e. if it drops below 18 it automatically kicks in, apart from at night. 24 Hours comes on all day to the temperature set on the boiler, not thermostat
 
Sherwood93 said:
24 Hours comes on all day to the temperature set on the boiler, not thermostat
Click to expand...
That is incorrect, if you have a room thermostat, the boiler thermostat doesn’t control anything. 24 hours means it is set to constantly on, have a look at the attached screenshot
 

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