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Thank you folks - I've had the Plumber around who has confirmed the same with the issue being the three way valve. Don't think i'll be trying to replace this myself though! First time i have used this forum and think its fantastic - it's you generous people with all that knowledge and are...

Hello good people - I have a Vaillant Ecotek plus system boiler, controlled by a Honeywell ST9400C. Up until recently everything was working fine with heating and hot water working independently. Then the heating stopped working and only works now when the hot water is switched on. With both...