Plumbers in hampshire based in aldershot, andover, basingstoke, brockenhurst, eastleigh,
fareham, farnborough, lyndhurst, portsmouth,romsey, southampton and winchester.
Fixing a leaking radiator
A leaking radiator should be remedied as soon as possible. If left, there could
be extensive damage to carpets or floorboards.
Before replacing a valve, check to see whether any leaking is occurring from a neighbouring
source. Dry the area surrounding the valve carefully. Then press tissue paper around
various points to ascertain the source of the leak. This is essential as water can
run round and drip, making another area appear as the cause of the problem.
If it is leaking from the spindle, use a spanner to tighten the
gland nut. If that proves unsuccessful, undo the nut and wind PTFE tape down into
the spindle.
If it is leaking at the coupling to the pipe, tightening the nut gently may
be all that is required. If that proves unsuccessful, then drain the radiator. Then
undo the cap nut, take off the fitting and replace the olive. Either smear the olive
with silicone sealant or wind some PFTE tap around the olive before retightening
the cap nut.
If the leak is caused by corrosion, a new radiator needs to be fitted. In
an emergency a temporary repair can be made using a plastic resin filler. To replace
the radiator, turn off the valves at each end. Remove the cap which holds the lockshield
in its position, then fit a key on the top. Turn off the manual valve at the other
end. Now the radiator can be removed and replaced. Use wire wool to clean corrosion
from the threads of both adapters and blanking plugs and either smear with silicone
sealant or wrap PFTE tap around the threads. Check that the wall brackets are secure
before replacing the radiator. Connect the valves to their adapters. To help with
any future corrosion problems, flush out the existing system with clean water and
add a rust inhibitor to the water.
If you need to repair the valve, you will need to drain part, if not all
of the system. Check that the replacement valve is the same type as the one being
removed. A different kind of valve may not align with the water pipe. Use an adjustable
spanner, unscrew the cap nuts connecting the valve to the water pipe, while holding
the body of the valve with a wrench. Unscrew the cap nuts holding the valve to the
adapter in the end of the radiator. You should now be in a position to remove the
valve from the site. Remove the valve adapter from the radiator by unscrewing it.
Clean the threads in the end of the radiator.
Wrap PTFE tape round the threads of the new adapter and screw it into the end of
the radiator, tightening with a spanner. Next slide the valve cap-nut and a new
olive over the end of the pipe and fit the valve. Using a similar method to the
dismantling of the old valve - hold the valve with a wrench and align it with the
adapter. Then tighten the cap nuts holding the valve to the adapter and the cap
nuts holding the valve to the water pipe. The system should now be ready for refilling
with water. The site of the fitting should be carefully checked for leaks. If necessary,
tighten the cap nuts a little more.
Once the system has been refilled the radiators will need to be 'bled', this is
done by undoing a screw at the top of the radiator with a special key (usually supplied),
this allows any air in the radiator to escape and the radiator to fill completely
with water. When bleeding a radiator you should not unscrew the plug completely,
just enough for the air to escape. When water starts to some from the screw, the
radiator is full and it can be closed. If the whole central heating system has been
drained for the repair then all the radiators have to be 'bled' to allow them to
fill.
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