T
t_smithy
Hi I hope someone can offer some advice to help me out with this problem. This is a DIY problem. I recently moved into a house 70's build.
I have an open vented central heating system.
Boiler: Worcester 9/14CBi
Controller: Potterton EP 2000
Pump: Grundfos 15/50
Valve: 3 way mid position ( HoneyWell V4073A1039)
The issue I have is that the downstairs radiators never get very hot. Only luke warm at best. Therefore the CH thermostat never cuts out the CH as the temp downstairs never gets above 15 degrees.
So I though it must be a balancing issue. If I turn the radiators off upstairs then the ones downstairs get nice and hot. So I balanced the system. I Started from upstairs and restricted the LSV's on all radiators. The downstairs radiators got a tiny bit hotter but not much. I spent many hours messing around with the balancing with no results.
So I though it must be sludge in the system. So I took off the downstairs radiators and flushed then out with a hose outside, there was a lot of sludge that came out. No change.
So i though it must be a pump issue. So I replaced the pump. No change.
So i thought it must be a 3 way Valve issue. So I drained down the system and replaced the valve. No change.
So i then added a cleaning chemical to the system for a week. Making sure I ran it through each radiator individually. No change.
When refilling the system I went through all the usual processes e.g. bleeding radiators, bleeding pump etc.
I then decided to attach a hose to the furthest radiator from the boiler downstairs and reverse flush the system using the mains pressure until the water came up into the F&E tank. After doing so I then drained the system, the water was pretty clean no sludge. No change.
So now I am stuck as where to go. Not sure I should waste my money on a power flush?
I just cant understand how the system can be so inefficient.
Any ideas.
Thanks
Tom
I have an open vented central heating system.
Boiler: Worcester 9/14CBi
Controller: Potterton EP 2000
Pump: Grundfos 15/50
Valve: 3 way mid position ( HoneyWell V4073A1039)
The issue I have is that the downstairs radiators never get very hot. Only luke warm at best. Therefore the CH thermostat never cuts out the CH as the temp downstairs never gets above 15 degrees.
So I though it must be a balancing issue. If I turn the radiators off upstairs then the ones downstairs get nice and hot. So I balanced the system. I Started from upstairs and restricted the LSV's on all radiators. The downstairs radiators got a tiny bit hotter but not much. I spent many hours messing around with the balancing with no results.
So I though it must be sludge in the system. So I took off the downstairs radiators and flushed then out with a hose outside, there was a lot of sludge that came out. No change.
So i though it must be a pump issue. So I replaced the pump. No change.
So i thought it must be a 3 way Valve issue. So I drained down the system and replaced the valve. No change.
So i then added a cleaning chemical to the system for a week. Making sure I ran it through each radiator individually. No change.
When refilling the system I went through all the usual processes e.g. bleeding radiators, bleeding pump etc.
I then decided to attach a hose to the furthest radiator from the boiler downstairs and reverse flush the system using the mains pressure until the water came up into the F&E tank. After doing so I then drained the system, the water was pretty clean no sludge. No change.
So now I am stuck as where to go. Not sure I should waste my money on a power flush?
I just cant understand how the system can be so inefficient.
Any ideas.
Thanks
Tom