I replaced an older boiler a couple of years back and it has highlighted a problem elsewhere in the system. It's a Vaillant but that's probably irrelevant. it has many more sensors and fail safes than the previous one, and regularly trips out because the inflow and outflow temperatures are too far apart.
It apparently gives it three seconds (or three attempts) to correct itself then shuts down with an error.
The first we know is the tank only has enough hot left in it to cover the time it takes to lather up, so rinsing off is under cold.
The engineer reckons the pump is a bit slow starting, which is going to be another £200.
There was nothing wrong with the old boiler (except uneconomical) and I wish I'd not bothered spending the £2k or whatever it was to change.
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Central heating new
Central heating new
