My vallient boiler is just five years old and have just putt he heating on for the first time this year. The heating and boiler work fine but when l change the timer clock which is on the front of the boiler and switch heating to'timer' the **** does not go round or move thus the heating will not come on unless l switch tot he 'on' position. I cannot put the heating on timer anymore. thank you
SOURCE: vaillant 831 combi boiler timer help
check to see the time clock is set with the clock symbol. there are three settings on analog clocks I , O and clock the I setting is constant running, the O setting is off and the clock setting is timer.
also try setting the thermostat up higher to see if the boiler fires.
SOURCE: Vaillant boiler no heating or hot water
refere to manual check for override switch loss of pressure no problem re-pressurise and check for leak top of rad valve good place to start
SOURCE: boiler working but radiators cold
Seems that you may have bad circulation pump.
Testimonial: "Thanks a lot for your help. Well, we couldn't figure out what/where the problem was. So we had to ask for professional help. And it turned out to be a faulty diverter valve. They have replaced the valve and our heating is back again!"
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