Frozen Radiator pipes

[Shax]

Hi I’m new need HELP
I had my garage converted to a bedroom
We had 2 radiators installed and under each window. The builder said he used installation and lagged the pipes in the walls so the pipes are not visible. My heating has been on and these 2 rads are cold whilst all the other rads in the house are warm. Exactly a year ago I had the same issue and once the weather was above freezing the rads started to get warm which tells me the pipes have frozen… I have spent a year chasing the builder but no joy what can I do to prevent this from happening the heating kicks in if temperature drops below 12

 

[Laurieo]

Are the TRV pins stuck down ,or the lockshields not open enough to get a flow ?.

 

[Jurassicspark]

Rule out common possibilities first such as air in the radiator, stuck TRV pin or even a balancing issue. I doubt your pipes are frozen.

Usually, you'll have a frost stat which turns on the boiler if the temperature drops too low. This should be placed in the coldest room.

Are the pipes microbore? Where do the cold radiator pipes come from?

Last resort, If you can still manage to access the frozen pipes, turn the boiler on (increase the pump speed) and grab a hot air gun to heat the frozen pipes.

 

[stem]

It maybe that because of the cold weather the TRV's on the radiators in the house are fully open and taking all of the flow from the pump, and those in the garage that could be an addition and maybe 'out on a limb' aren't getting anything. As a test, you could try turning the radiators off in house and seeing if the radiators in what was the garage heat up then. If they do, it could just be a matter of balancing the system.

 

[Madrab]

When it's not freezing do all the rads warm up properly? If so , turn off the other rads at their TRV's, do they then warm up? If they still stay cold then if the builder didn't run the pipes properly, i.e. - inside the thermal envelope - and didn't insulate them properly then yes the feeds could slush up and stop the flow. Wouldn't be the first time I've come across that with a converted garage that wasn't done properly.

If that is the case and the pipework is in the walls and not installed properly then the only real fix is to find the feeds and reposition them so they are brought into the insulated space. Not the best news I know but if not done then it can just re-occur.