Hello again folks!
Man I'll be glad when this boiler saga is all sorted, but I digress...
Ever since BG replaced the heat exchanger on 6th Jan (now 15 days ago), we have had constant cut-outs of the boiler due to the activation of the dry-heat stat in the Ideal Minimiser FF80 boiler.
The BG engineer said that this may be due to air in the pipe-work after the full drain-down.When re-filled, the c/htg had a small container of Fernox inhibitor added.
The pipework is probably (best guess) 25 years old as are most of the 14 double radiators on the system.
Whilst not "cold", the rads are noticeably colder at the bottom than at the top - an indication of sludge in the rads I think.
Every time the boiler cuts out and the dry-heat stat needs "resetting", I check the all of the rads and apart from the tall towel rail in the bathroom (with the highest vent in the house), the rads do not need venting.
Since the heat exchanger has been replaced, we have had a new boiler thermostat AND a dry-heat thermostat fitted.
So, my question is that due to the constant build-up of air (or gas) in this rad is this due to internal corrosion of the radiators on the system.
Incidentally, there is no sound of flowing water (eg bubbles) in the rads or pipework when the pump & heating are running, the pump hums quietly and the rads all heat up - so I find it hard to believe that it is trapped air in the pipework - so I am more inclined to believe that it is a build up of gas due to corrosion.
Do I need more inhibitor in the water or (more likely) a power-flush of the system?
One final question. Should BG have ensured that all of the radiators were properly bled of air or were they correct to leave this up to us? Opinions please.
Cheers,Dave
Man I'll be glad when this boiler saga is all sorted, but I digress...
Ever since BG replaced the heat exchanger on 6th Jan (now 15 days ago), we have had constant cut-outs of the boiler due to the activation of the dry-heat stat in the Ideal Minimiser FF80 boiler.
The BG engineer said that this may be due to air in the pipe-work after the full drain-down.When re-filled, the c/htg had a small container of Fernox inhibitor added.
The pipework is probably (best guess) 25 years old as are most of the 14 double radiators on the system.
Whilst not "cold", the rads are noticeably colder at the bottom than at the top - an indication of sludge in the rads I think.
Every time the boiler cuts out and the dry-heat stat needs "resetting", I check the all of the rads and apart from the tall towel rail in the bathroom (with the highest vent in the house), the rads do not need venting.
Since the heat exchanger has been replaced, we have had a new boiler thermostat AND a dry-heat thermostat fitted.
So, my question is that due to the constant build-up of air (or gas) in this rad is this due to internal corrosion of the radiators on the system.
Incidentally, there is no sound of flowing water (eg bubbles) in the rads or pipework when the pump & heating are running, the pump hums quietly and the rads all heat up - so I find it hard to believe that it is trapped air in the pipework - so I am more inclined to believe that it is a build up of gas due to corrosion.
Do I need more inhibitor in the water or (more likely) a power-flush of the system?
One final question. Should BG have ensured that all of the radiators were properly bled of air or were they correct to leave this up to us? Opinions please.
Cheers,Dave