We have a Vokera Excel 80SP and over the last 3-4 months, the boiler has started making noises mainly when the hot water tap is run. It sounds like a loud rattling/banging. It does it for about 5-10 seconds when the hot water is run for the first time for a while. After this, its fine for a while, even if the hot water tap is switched off and on in between.
Interestingly, the hot water pressure also drops to just above 0 bar whilst this noise occurs and then slowly rises again when the system isn't used for a while, back up to 1.5 bar over the course on about an hour.
The auto air vent also seems to be leaking - could this be contributing?
Any ideas on what this could be - the drop in pressure is worrying, it almost makes me think there is something wrong with the flow diverter but being new to combi boilers, I would like some advice before I call somebody out.
The noise and vibration seemed to have caused the supply value to the main heat exchange to become loose - another leak, so I want to resolve this before it happens again.
Thanks in advance and great forum!
Interestingly, the hot water pressure also drops to just above 0 bar whilst this noise occurs and then slowly rises again when the system isn't used for a while, back up to 1.5 bar over the course on about an hour.
The auto air vent also seems to be leaking - could this be contributing?
Any ideas on what this could be - the drop in pressure is worrying, it almost makes me think there is something wrong with the flow diverter but being new to combi boilers, I would like some advice before I call somebody out.
The noise and vibration seemed to have caused the supply value to the main heat exchange to become loose - another leak, so I want to resolve this before it happens again.
Thanks in advance and great forum!