Help,
Our Worcester Heatslave 20/25 oil fired boiler has been playing up again recently. Over the past 14 months we have had a new burner, diverter valve, expansion vessel plus 3 bar valve and an auto air vent replaced.
The latest problem started with low pressure on the boiler (discharged through the PRV). System was topped up to 1 bar, and expansion vessel checked - it still has air in it (1 bar), so we assume this is ok.
Since this, the boiler is now overpressurising when the heating is on (not when cold, so can't be filling loop / heat exchanger problem) and the radiators are getting hotter than normal.
We have the central heating on twice a day. When we open the upstairs bathroom hot water tap in the morning (20 mins after heating's been on) there is a groaning pipe noise from the tap to the boiler - sometimes with a bang, as if there is air pressure building up.
The boiler pressure (heating circuit) increases towards 3 bar, but if we run the hot water tap, this reduces to about 2 bar and appears to settle. Next time the heating is switched on, the same scenario occurs.
All radiators have been bled and there is no air.
We have spent £560 on plumbing call outs in the past 14 months.
Any suggestions please - is it likely that the divertor would have failed within 12 months, or could it be something else?
Thank you
Our Worcester Heatslave 20/25 oil fired boiler has been playing up again recently. Over the past 14 months we have had a new burner, diverter valve, expansion vessel plus 3 bar valve and an auto air vent replaced.
The latest problem started with low pressure on the boiler (discharged through the PRV). System was topped up to 1 bar, and expansion vessel checked - it still has air in it (1 bar), so we assume this is ok.
Since this, the boiler is now overpressurising when the heating is on (not when cold, so can't be filling loop / heat exchanger problem) and the radiators are getting hotter than normal.
We have the central heating on twice a day. When we open the upstairs bathroom hot water tap in the morning (20 mins after heating's been on) there is a groaning pipe noise from the tap to the boiler - sometimes with a bang, as if there is air pressure building up.
The boiler pressure (heating circuit) increases towards 3 bar, but if we run the hot water tap, this reduces to about 2 bar and appears to settle. Next time the heating is switched on, the same scenario occurs.
All radiators have been bled and there is no air.
We have spent £560 on plumbing call outs in the past 14 months.
Any suggestions please - is it likely that the divertor would have failed within 12 months, or could it be something else?
Thank you