Hi All,
I have recently moved into a house that had a combi boiler fitted approximately 6/7 years ago.
Rather unfortunately, the combi boiler is a Biasi Riva Compact (M96.28SM/C2), which I know have a bit of a reputation for being “bottom of the barrel”.
There are a few things concerning me about the heating system.
1. Immediately following its annual service the boiler ignition electrodes have gone crazy! Prior to the service they would click once, the flame would ignite and all was well. However since the service the boiler ignites on the first click still, however the clicking continues after the flame is visible for approx 10 seconds (20-30 ticks in total?). I understand that this particular boiler has two spark electrodes and a detection electrode. Could the flame detection electrode have been accidentally knocked during the last service or be on its last legs? The plumber that did the service has basically said that he hasn’t done anything that would affect the electrodes it and is rather unwilling to check it!
2. All of the radiators have TRV’s fitted. Whilst I understand that the boiler has a built in bypass to protect the heat exchanger when the TRV’s close, I am of the opinion that a secondary bypass is also required with this model of boiler? Presumably this is easily gotten around by removing, say the TRV’s from the hallway and bathroom?
3. Loud knocking noise from bedroom radiator when boiler fires up from cold. I’m assuming that this is thermal expansion, causing one of the pipes to rub against a joist or something as when I have lifted the radiator slightly the ticking seems to stop. Is there anything else I could try to bottom it out further?
Apologies for all the questions but I’m starting to think that this heating system was put in by a non competent person!
Lee
I have recently moved into a house that had a combi boiler fitted approximately 6/7 years ago.
Rather unfortunately, the combi boiler is a Biasi Riva Compact (M96.28SM/C2), which I know have a bit of a reputation for being “bottom of the barrel”.
There are a few things concerning me about the heating system.
1. Immediately following its annual service the boiler ignition electrodes have gone crazy! Prior to the service they would click once, the flame would ignite and all was well. However since the service the boiler ignites on the first click still, however the clicking continues after the flame is visible for approx 10 seconds (20-30 ticks in total?). I understand that this particular boiler has two spark electrodes and a detection electrode. Could the flame detection electrode have been accidentally knocked during the last service or be on its last legs? The plumber that did the service has basically said that he hasn’t done anything that would affect the electrodes it and is rather unwilling to check it!
2. All of the radiators have TRV’s fitted. Whilst I understand that the boiler has a built in bypass to protect the heat exchanger when the TRV’s close, I am of the opinion that a secondary bypass is also required with this model of boiler? Presumably this is easily gotten around by removing, say the TRV’s from the hallway and bathroom?
3. Loud knocking noise from bedroom radiator when boiler fires up from cold. I’m assuming that this is thermal expansion, causing one of the pipes to rub against a joist or something as when I have lifted the radiator slightly the ticking seems to stop. Is there anything else I could try to bottom it out further?
Apologies for all the questions but I’m starting to think that this heating system was put in by a non competent person!
Lee