Hi, My radiators down stairs are only luke warm yet the radiators up
stairs are. I've checked the pump and it is hot with slight vibration,
the hot water tanks pipe at the top and bottom are luke warm yet the
middle pipe is hot, any suggestions?
You probably need to balance your radiators.
What you need to do is turn the valves down on the upstairs rads which
should allow the water to circulate properly. At the moment all the heat is
going to the rads upstairs.
Several possibilities, the radiators need balancing, they need the air
bleeding out, or the pipes/radiators downstairs are blocked with sludge. If
the radiators were working fine last winter, and no one has touched the lock
shield valves (the radiator valves that you don't use to turn them off and
on) then air or sludge could be obstructing the circulation of water. We
could give you a better answer if you tell us more. For example, has anyone
turned the lock shield valves? Has the system ever worked properly?
Is it microbore or proper pipes. I found that microbore in an older system
can sludge up if the CH is not run over the summer (so can 15mm piping if
you're unlucky like I was this summer). Drain the system a bit, Put some
sludge cleaner into the system, run it for 2 - 4 hours with the CH
thermostat right up then drain and refill, but remember to put some Fernox
inhibitor in to stop further sludging.
You don't say whether your rads are fitted with TRVs (Thermostatic Radiator
Valves). If they are then the pins could be sticking (often happens with
older TRVs over the summer).
The problem is easy to fix - remove the 'head' of the TRV (there are various
types of fixings from grub-screws requiring an allen key to sliding plastic
collars that simply require the 'head' to be fully turned 'out' and the
collar slid back). Once you have removed the head you will expose the pin
sticking out of the valve. Grasp the pin with a pair of pliers and *gently*
work it in and out to free it up.
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