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Guys, Thank you for your replys. Managed to sort the problem after caryying out some investigations. Turned out to be the Room Thermostat, out of all things!! Some one left the thermostat under the table lamp hence it was reading the temp from the light, and then switched off the heating...

hi sime10, its the turbomax 242 according to the log book. clock is mechaincal.

I've recently moved into a house which contains a Vaillant turbomax combi. System was installed 3 years ago. The heating and hot water have been working fine until today!! I've set the timer for the heating to come on at 5pm which it did, rooms all nice a warm, then at 6pm I noticed the heating...