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Another associated problem with sluggish radiator performance can be attributed to un-
circulated undiluted anti freeze in the boiler and pipe work. This problem is usually worse
in cold conditions. In order to cure the problem, try the following method.
1. Turn off one radiator valve on the largest radiator. Increase the pressure in the
system to 2.0bar. Now release 0.5 litre of fluid from the air vent cap on the radiator
into a container.
2. Close the vent and re-pressurise the heating circuit to 2.0bar and open the radiator
valve which was closed on the initial purge. Close the valve previously open (you
will need a screw driver and adjustable spanner to open and close the lock shield
valve). Release another 0.5 litre of fluid from the air vent cap. This procedure
should have cleared any concentrated anti freeze from the pipe work.
3. Re-pressure the boiler to 1.6bar and open both the radiator valves fully and run the
heating. Once the boiler has established full heat at the radiator, close one of the
valves on the working radiator. Other radiators should now slowly start to heat up.
Radiators which fail to heat up may require purging as above.
4. If time is not a problem, simply leave the heating on. After an hour or two the
problem will clear itself.
COLD RADIATORS
These usually appear in pairs, due to crossed pipe work, i.e. one radiator is fed with two
flow pipes with a second radiator fed with two returns, and consequently neither radiator is
capable of circulation and remains cold.
Always check that the valves are open. Some systems are not heat tested before
despatch, and it is possible that the valves may be closed very tightly. If in doubt check by
removing the plastic head and use a spanner to open the valve.
THINGS TO CHECK BEFORE MAKING ANY ADJUSTMENTS
1. Mains cold water supply valve fully open.
2. Gas installation correct. Regulator/pipe size correct/UPSO/OPSO working
correctly.
3. Gas supply valves open/isolation valve on boiler fully open.
4. Power supply to boiler socket present.
5. Air pressure switch test point cap fully located. (Black rubber cap on the right hand
side on the top of boiler)
6. Correct water pressure is in the heating circuit (1.6Bar when cold)
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