Central heating not reaching set temperature

Joined
3 Sep 2015
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United Kingdom
Hey guys,

We have a valiant combi boiler, serviced and checked a month or two ago (by someone we've been using for years at another property), and a honeywell hc60ng thermostat unit.

We use this on 'manual' mode, if I come in and switch it to on, with the temperature arrows set to say 21, it fires up the boiler, the rads come on, but then it seems to stop at 19 or so, refusing to go any hotter - even if left on (like last night) for say 5 hours.

It doesn't seem to make any difference if I use the temperature things to push it to say 25, it still seems to get to 19 or so (in about half hour) and then just sit there.

I'm not too fussed but my girlfriend is quite chilly (she doesn't have as much built in insulation as me :LOL:).

The radiators feel warm/hot and the tops don't feel cold or anything, any ideas anyone? - When I'm home I can supply pictures galore.

Cheers!
 
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