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:oops: I have just realised that I have broken my own rules and used a TLA (Three Letter Acronym) that i don't know the meaning of in my posts. Could anybody explain what NTC stands for? Wikipedia has a number of stabs at it, but none of them relate to boilers. :) i found the answer to my...

Slightly baffled after conversation with Vaillant tech support, i checked out the following. When tap initially turned on boiler goes to full burn, flow pipe very hot to the touch (cannot touch!), water from tap very hot (60degrees) then boiler switches to slow burn, flow pipe gradually cools...

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Any tips gratefully received that might help to diagnose my Vaillant 835 ecomax DHW problem. Symptoms: Turn on hot tap, boiler fires up, get piping hot water at 60 degrees (as set by the DHW dial). 1. Boiler temp hits 75 degrees (Vaillant default) and boiler appears to scale back its...