I have a glow worm fuel saver 25-30 boiler.
Its fires up ok to give me hot water but I cant get heat to any of my
Is there anything easy I could check without blowing the house up before I
call an engineer?
Check that the control unit is making good switch connections - when
you switch the central heating on and off, does the display change
accordingly? If not, the switch connections may not be making
properly, and you need to replace the control unit.
If that's ok, check that the motorised servo switch that switches
between hot water and central-heating is not corroded or limescaled up
and is free to move.
It will probably be near the hot-water tank, so most probably in the
airing cupboard. There will usually be one pipe going in - from the
boiler - and two coming out - one to HW and the other to CH - and
in response to electrical signals from the rest of the system a servo
motor inside the cap rotates the valve to connect each output in turn
to the input. The spindle of the valve may protrude through the
surface of the cover, and there may be a depression on the top of it
that you can put a coin into and twist it to free it. Be sure to
twist in same the direction of any arrow on the cover.
This may be sufficient to get it going for the moment, but it's
probably a sign that your system needs maintenance, probably at least
descaling, and probably replacemet of the servo switch. In time the
cogs on the motor get worn away, and in that event the entire unit
will need to be replaced.
Search this group for previous threads on this topic.
On Sun, 26 Sep 2010 19:39:14 +0100, "tomm"
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