We have a glow-worm space saver Mk11 Balanced Flue Boiler in the kitchen,
which is used to heat the
water and supply the radiators when heating is required.
Upstairs in the 2nd bedroom there is a cold water tank and hot water tank
with an electric emersion heater.(never used).Also a motorised Mid Position
Today on returning home from work, the hot water has come on via the combi
boiler(no heating on) but the radiators downstairs were all red hot, even
though the timer was set to hot water only and the thermostat in the hallway
was on minimum.
The Boiler setup is a Y PLAN according to this site, if this helps..
I don't understand the reference to a 'combi' boiler. Surely, it's a
conventional boiler providing CH and stored HW rather than 'instant' HW,
When did you last consciously use the heating?
The most likely cause of your problem is that the mid-position valve has
stuck, and isn't returning to the HW-only position - but that begs the
question as to why it ever moved away from this position in mid-summer. In
addition, I would have expected the upstairs radiators to be hot at the same
time - unless they're all turned off, or are all fitted with TRVs which have
been turned down.
Not too sure of how your system is set up. Is the combi connected as
part of the heating circuit with the glow worm or are the two
separate? Sounds like could be a problem with the cross connection
bettween the two.
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