I have a Baxi Bahama boiler.
It has a history of failure (not disclosed to us when we bought our house nearly 2 years ago)
When we moved into our house nearly 2 years ago the boiler had zero pressure (0 on pressure gauge) and would often lock out.
We recharged the pressure to 1bar but this would make the pressure rise to 3 bar with the CH running.
We discovered that the expansion vessel needed repressurising, once this was done the pressure for the CH remains steady at about 2 bar when running.
We also fitted a new PRV at the same time (old one knackered most likely from over pressurising)
Despite the pressure being stable the boiler would occasionally lock out (flame failure light comes on) and required the reset switch to be pressed for the boiler to work.
We started to keep a note of the lockouts to try an find a pattern, but all this told us was that they seemed random.
After a bit of research on this boiler we replaced both flow switches as these seemed a common issue with the Bahama. We also found the diverter cartridge to be stiff so replaced that too. We also changed the Overheat Stat, Thermistor and had a new control board as there seemed to be some resistors with heat damage on ours.
The fault with the boiler remained but now seemed to only occur with DHW and not CH.
We noticed that the mains water pressure was a bit low in our house and replacing 2 old stop taps in the kitchen with a new one improved this (previously we couldn't run the electric shower after flushing the loo but now we can, and the boiler would lockout if you ran the hot tap to wash your hands after flushing the loo).
We also had fluctuating hot water so have had the plate heat exchanger, CH filter and flow regulator changed.
Despite changing all these parts the boiler is still occasionally (6 times in the 10 days since the plate heat exchanger was fitted) going to lockout. It seems to do this on DHW demand and it seems to be an instant lockout, you can tell when it has gone as you can run the tap and no hot water comes through at all. The one time I have managed to be standing by the boiler when it did it I saw the flame failure light come on as soon as the hot water tap was turned on.
What could possibly be wrong with this boiler that hasn't already been changed. It has just been serviced and the heating guy is at a loss to the cause of the lockouts too. We have checked the air pressure pipes to the APS and they look and feel OK. My next guess is the CVI module or what else?
Any ideas to try next?
I know the best course would be to replace the boiler with another and eventually I will but would rather not have to fork out the £2K+ just yet, and wouldn't even know which boiler to choose.
Any help greatly appreciated
Vicky
It has a history of failure (not disclosed to us when we bought our house nearly 2 years ago)
When we moved into our house nearly 2 years ago the boiler had zero pressure (0 on pressure gauge) and would often lock out.
We recharged the pressure to 1bar but this would make the pressure rise to 3 bar with the CH running.
We discovered that the expansion vessel needed repressurising, once this was done the pressure for the CH remains steady at about 2 bar when running.
We also fitted a new PRV at the same time (old one knackered most likely from over pressurising)
Despite the pressure being stable the boiler would occasionally lock out (flame failure light comes on) and required the reset switch to be pressed for the boiler to work.
We started to keep a note of the lockouts to try an find a pattern, but all this told us was that they seemed random.
After a bit of research on this boiler we replaced both flow switches as these seemed a common issue with the Bahama. We also found the diverter cartridge to be stiff so replaced that too. We also changed the Overheat Stat, Thermistor and had a new control board as there seemed to be some resistors with heat damage on ours.
The fault with the boiler remained but now seemed to only occur with DHW and not CH.
We noticed that the mains water pressure was a bit low in our house and replacing 2 old stop taps in the kitchen with a new one improved this (previously we couldn't run the electric shower after flushing the loo but now we can, and the boiler would lockout if you ran the hot tap to wash your hands after flushing the loo).
We also had fluctuating hot water so have had the plate heat exchanger, CH filter and flow regulator changed.
Despite changing all these parts the boiler is still occasionally (6 times in the 10 days since the plate heat exchanger was fitted) going to lockout. It seems to do this on DHW demand and it seems to be an instant lockout, you can tell when it has gone as you can run the tap and no hot water comes through at all. The one time I have managed to be standing by the boiler when it did it I saw the flame failure light come on as soon as the hot water tap was turned on.
What could possibly be wrong with this boiler that hasn't already been changed. It has just been serviced and the heating guy is at a loss to the cause of the lockouts too. We have checked the air pressure pipes to the APS and they look and feel OK. My next guess is the CVI module or what else?
Any ideas to try next?
I know the best course would be to replace the boiler with another and eventually I will but would rather not have to fork out the £2K+ just yet, and wouldn't even know which boiler to choose.
Any help greatly appreciated
Vicky
