View Single Post
  #1   Report Post  
Posted to uk.d-i-y
Simon T[_2_] Simon T[_2_] is offline
external usenet poster
 
Posts: 7
Default Central heating won't turn off

OK, I know other people have had this problem and have done a cursory Google
search, but have not been able to shed much light on what might be the
problem in my particular case.

Basically, the central heating round at my parents house refuses to switch
off, even when the thermostats aren't calling for heat and the timer is off.
The pump continues to run and the boiler continues to heat the water and the
only way to get it to switch off is to turn everything off at the mains.

I suspected it might have been a stuck 2-port valve, but having checked both
of these found that neither one (CH or DHW) were stuck and appeared to be
operating fine.

Their set up is a standard Gravity Fed System with the feed and expansion
tank in the loft.
Glow Worm hideaway boiler (in a small room next to the kitchen)
Danfoss Electronic Timer (in the kitchen)
Danfoss Room Thermostat (in the Hall)
2x Danfoss 2-port valves (for CH & DHW - in Airing cupboard next to hot
water cylinder)
Danfoss cylinder stat (in airing cupboard)
CH pump (unsure of make - in the airing cupboard)

Again, the 2-port valves were most definitely not jammed open, which was my
first guess. In fact when I went round there to check them, I found my
mother had switched the gas off on the boiler (it didn't occur to her to
switch off the power supply), the timer was off, both 2-port valves were
closed, but the pump was still running?

Any suggestions what to try next?

Thanks in advance.


--
Best Wishes
Simon (Dark Angel)
http://www.realmofhorror.co.uk
http://www.facebook.com/pages/Realm-...43030832454357

..