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Ok! You get a cookie! Another guy arrived on Monday and replaced the heat exchanger, found the temperature differential was still surprisingly high, and started looking again. He said we had the *wrong* pump fitted (5m head rather than 7m) - which to me seems rather bizarre; but about a...

Well he did a good look at the temperature differences and then checked it with a mate on the phone before confirming that as his diagnosis; so it's at least two of them who are mistaken, and there are at least a zillion people on the web who've had the same problem and ended up replacing the...

Hi Bunnyman, thanks for the answer, I hadn't realised that there were two levels of code, some that weren't displayed by default. Today was the first time since I posted that I managed to catch it in the act, and it did indeed give an s53 (followed by an S27). In between, the Vailant eng...

Thanks, I'll try that; although if that was happening shouldn't it have shown that code on the display anyway? (I don't think I spotted it displaying anything on the video).

Hi, We've got an ecoTEC+ 937 that's intermittently misbehaving - primarily while I'm in the shower and giving me cold water :-( we're going to call Vaillant out to look at it (it's under contract) but wondered if anyone had any thoughts. One specific question is where is the 'flow...