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Good idea about the NTC's, I will try it. I did consider changing the main PCB but it's a bit expensive. Maybe the later PCBs have a newer version of the firmware which contains the perameters for the PID loop and may also improve the microfiring problem? I managed to greatly reduce the...

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...

Many thanks for the info; why can't Valliant put that in the mauanl! I have tried changing d23 on the boiler but it does not respond, it is permenantly set to winter, which it why I thought it might be set by the VRC400 via the e-bus

Yes, the system does have a VR65 and 2 single port valves. Interesting you should say about adjusting the "set-back" temp, it's not quite clear from the manual exactly what this does. So going back to my original question, how do you disable the heating on a summers day when the morning temps...

One point which may be relavent is the summer/winter function on the boiler (d23, 1= winter, 0 = summer). Mine is set to 1 and I do not appear to be able to change it with the butttons on the front. Maybe this function is suppose to be changed by the VRC400 via the e-bus. I have enabled the...

The VRC400 wall mounted in the hall.

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...