Hi - this has baffled me and the heating engineer I've called in to look at it. My Baxi 105e has been reporting a fault, the LED indicating it's with the pump or low pressure. However, a quick reset at the mains and all is well again. If there's either a DHW or CH demand, the boiler fires up and all is well - hot water and rads as normal. BUT - if there isn't a demand, or once the demand has ceased (and the overrun has finished as well in the case of the CH) then the boiler returns to fault mode after about 2 seconds.
The engineer has scratched his head a lot, replaced the PCB (no change) and seems clueless.
Pressure is at about 1.6 bar cold, but over the summer it looks like the boiler was running on low pressure as a result of a leak we hadn't spotted (I've since re-pressurised from filling loop). I'm now wondering whether there could be a problem with the expansion vessel and judging by the dust on the top of the boiler, the engineer hasn't checked it.
Any ideas?
Ta
Mac
The engineer has scratched his head a lot, replaced the PCB (no change) and seems clueless.
Pressure is at about 1.6 bar cold, but over the summer it looks like the boiler was running on low pressure as a result of a leak we hadn't spotted (I've since re-pressurised from filling loop). I'm now wondering whether there could be a problem with the expansion vessel and judging by the dust on the top of the boiler, the engineer hasn't checked it.
Any ideas?
Ta
Mac