My system is mains gas, Netaheat Profile 60e with 10 rads, 4 upstairs and 6 down.
I have a BG 3 star maintenance plan.
Events go like this:-
System functioning okay bar one rad downstairs. Boiler keeps tripping out on overheat though.
BG do annual visit 5/1/06. Diagnose problem with TRV on rad and pipe connected to fan sensor is disconnected. Replace pipe. System okay now but not brilliant. Engineer also strongly recommended powerflush for £440.
11/1/06 - reset switch on boiler fails completely. Engineer visits and orders part.
13/1/06 - part fitted but in meantime all bar one of the downstairs rads is failing to heat. Flow pipe is hot but return pipe is cold. Upstairs is fine. Header tank filling with hot water. He replaces the following:-
2 Ranco thermostats.
Grundfoss main circulation pump.
2 x 22mm pump valve ball type.
I agree to have the powerflush done and engineer asks for a rush job. This is a friday. Call received saying powerflush will be done monday 16th.
16/1 - powerflush started at 9:30, engineer leaves 4:30. System is in a bad way and he will have to come back. Blockage somewhere. No heat or water. Engineer has flushed all rads and the primary circuit. Powerflush machine connected across downstairs radiator tails.
18/1 (today). Engineer returns at 9:30 and leaves at 3pm. Primary system re-flushed. Downstairs rads removed and flushed through by hose. This time he flushed across the primary pump.
End result - upstairs rads are super hot. Downstairs rads bar one are stone cold. The one rad that is working is a more recent addition to the system and is branched off the main pipes at ceiling level.
The system has been flushed twice now and I cannot fault the guy, he was very thorough. He says he will need to return next tuesday at the earliest and either
a) re-flush for a third time.
b) investigate possible system design fault with floorboards up etc.
Does b sound likely? System is around 15 yrs old and has worked perfectly up until the start of this year. All rads were uniformly hot.
Is it possible one of the engs has done something inadvertantly that is stopping the flow to the downstairs rads? I asked if the motorised valves were set okay - he said yes. (had a problem with a motorised valve a few years back that gave similar symptoms).
Any ideas?
I have a BG 3 star maintenance plan.
Events go like this:-
System functioning okay bar one rad downstairs. Boiler keeps tripping out on overheat though.
BG do annual visit 5/1/06. Diagnose problem with TRV on rad and pipe connected to fan sensor is disconnected. Replace pipe. System okay now but not brilliant. Engineer also strongly recommended powerflush for £440.
11/1/06 - reset switch on boiler fails completely. Engineer visits and orders part.
13/1/06 - part fitted but in meantime all bar one of the downstairs rads is failing to heat. Flow pipe is hot but return pipe is cold. Upstairs is fine. Header tank filling with hot water. He replaces the following:-
2 Ranco thermostats.
Grundfoss main circulation pump.
2 x 22mm pump valve ball type.
I agree to have the powerflush done and engineer asks for a rush job. This is a friday. Call received saying powerflush will be done monday 16th.
16/1 - powerflush started at 9:30, engineer leaves 4:30. System is in a bad way and he will have to come back. Blockage somewhere. No heat or water. Engineer has flushed all rads and the primary circuit. Powerflush machine connected across downstairs radiator tails.
18/1 (today). Engineer returns at 9:30 and leaves at 3pm. Primary system re-flushed. Downstairs rads removed and flushed through by hose. This time he flushed across the primary pump.
End result - upstairs rads are super hot. Downstairs rads bar one are stone cold. The one rad that is working is a more recent addition to the system and is branched off the main pipes at ceiling level.
The system has been flushed twice now and I cannot fault the guy, he was very thorough. He says he will need to return next tuesday at the earliest and either
a) re-flush for a third time.
b) investigate possible system design fault with floorboards up etc.
Does b sound likely? System is around 15 yrs old and has worked perfectly up until the start of this year. All rads were uniformly hot.
Is it possible one of the engs has done something inadvertantly that is stopping the flow to the downstairs rads? I asked if the motorised valves were set okay - he said yes. (had a problem with a motorised valve a few years back that gave similar symptoms).
Any ideas?