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We had a Vaillant 418 boiler installed 4 years ago along with a VRC400 weather compensator and unistor hot water storage tank, the system is run vented. After much time spent twiddling with various settings I finally got the system to work reasonably well with a minimum of problems with...

We have recently had a Vaillant 418 installed with a VRC400 weather compenastor. System works really well, relativly easy set-up on VRC400, however, now the warmer weather is here there is a tendency for the heating to come on first thing in the morning when the outside temp is about 5 or 6 Deg...