Just a few suggestions for you to try.
Try locking open both motorised valves with the manual slider control, then
fire up the boiler on both heating and hot water setting. If the system
runs OK, then release one motorised valve at a time to see if they do close.
If they close when you release them, then they are either not wired
correctly or are faulty. With the system running both heating and hot
water, both valves should stay open.
You could also try turning down the speed of the pump if the valves pass the
above test, as it might just be that the coil in the hot water tank is not
taking the full pressure of the pump properly. Furred up pipes or a
blockage or a valve not turned on fully can be the cause of this.
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(1) Are you sure the pump is running? If the pump is not running, the boiler
could be literally boiling, then the steam pushing water out of the
(2) If you run the central heating do the radiators get hot? If not this
again suggests that the pump is not working. This can be due to a faulty
pump, or due to an air lock near the pump or air in the pump. Have you bled
(3) As suggested by BigWallop, if your valves are closed then again water
will not circulate even though your pump is running and the symptoms as
described could occur.
Some things not clear from your post:
(1) Is the hot water heating up O.K.? If so, is the hot water side pumped or
(2) If both CH and hot water are pumped do you have two seperate valves, one
for hot water and one for CH, or a single threeway valve?
(3) Does this problem happen when running HW only, CH only, or both together
(or all three)?
Thus spake Paul Bendall unto the assembled multitudes:
Good heavens. 15 buckets???? It sounds like you're draining the system
rather than bleeding air out of it. You should stop bleeding the rad as
soon as air stops escaping and liquid comes out instead. This should only
take a few seconds on each rad. Silly and unintendedly
patronising-sounding question this, but are you sure you're bleeding from
the correct valve on the rads? The bleed valve is at the top of the rad on
one end, usually with a square key.
Andy Clews University of Sussex Computing Service
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