call the person who fitted the new pump .............
Many thanks Terry.If TRV,s are fitted (Thermostatic rad valves) to downstairs rads ,check they are not stuck in closed position. It's unlikely with more than one radiator not working,but still worth ruling them out.
You can then drain one radiator ( if necessary remove it) and open one of its valves allowing water to flow out for ten seconds. There should be a strong flow. You will need to keep system pressure topped up whilst doing this. If you can ,mock up a hose connected to rad valve and out to a drain .
Do the same test on the other valve.
If no continual stream of water from valve ,there is a blockage.
Depending on result other rads may need to be tested too.
One rad (ground floor) finally came off. Plasterboard was cutout (1)If you really can't remove the rad, drain system ,take TRV off pipe, remove rad ,refit TRV and refill system. Or try another approach ( not as good really).
Reconnect rad to valves and close both valves.
Using the air bleed valve at top of the rad ,open it with key and have large towel handy, water will trickle out for a bit then it will stop.
Leaving the bleed valve open ,and ready to contain water( bucket and towel ) ,open the lockshield valve only. Water should run out the bleed valve continuously for I full minute ( someone keeping pressure topped up).
Then close the lockshield ,and open the TRV, again let water flow for 1 full minute out the bleed valve.
If water ceases to flow from one valve ,that pipe is blocked.
Will get this checked out. Thanks.I would check that hot water zone valve isint jammed open and if you have a automatic bypass that it isint stuck open.
Ground floor rad in dining room was drained.Where on the system are you draining down from ? It's not unusual for some ,or all ,ground floor rads to be full of water when draining from one single point on the ground floor. All rads above the draining point would empty ,others may or may not ,depending on pipework layout.
All the rads on the ground floor were removed.If TRV,s are fitted (Thermostatic rad valves) to downstairs rads ,check they are not stuck in closed position. It's unlikely with more than one radiator not working,but still worth ruling them out.
You can then drain one radiator ( if necessary remove it) and open one of its valves allowing water to flow out for ten seconds. There should be a strong flow. You will need to keep system pressure topped up whilst doing this. If you can ,mock up a hose connected to rad valve and out to a drain .
Do the same test on the other valve.
If no continual stream of water from valve ,there is a blockage.
Depending on result other rads may need to be tested too.
What you have done proves the above isn't the case ,and you need to relay that to them. I assume these ground floor rads worked perfectly well prior to central heating being turned off for summer months ?Contacted Vailliant:
According to Valiant, the ground floor rads not working suggests an airlock/ restriction.
You're a star, thank you.What you have done proves the above isn't the case ,and you need to relay that to them. I assume these ground floor rads worked perfectly well prior to central heating being turned off for summer months ?
From what you have told us ,and done ,it sounds like an issue with the pump.
Apologies for the delay in updating this threadGood luck. You will need to add chemical inhibitor to your system ,as it will have been lost whilst draining down.
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