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Thanks for your reply , most of the electronics/ circuit boards were replaced under guarantee by vaillant engineer including the VRC430, I replaced the outside temp sensor and run a new cable but the problem persists. The only thing that was not replaced was the VR 65.I can understand a break...

The system works except for the weather compensator showing an outside temperature of minus 50 centigrade 5 or 6 times a day ( usually for about 15 to 20 seconds each time). When this happens the boiler shuts down until the outside temp shows the real outside temp again then continues as...

This boiler and its control gear was installed almost two years ago and the guarantee is about to run out! The system seems to work fine except for the weather compensator showing an outside temperature of minus 50 centigrade 6 to 10 times- or more? a day ( usually for about 15 to 20 seconds)...