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Vaillant boiler clock not working

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

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  • Water Heaters Master
  • 2,544 Answers

Your timer clock may need to be replaced.

Posted on Aug 12, 2017

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6ya6ya
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Posted on Jan 02, 2017

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  • 30 Answers

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.

Posted on Mar 30, 2009

mrhotandcold
  • 248 Answers

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

Posted on Oct 11, 2009

  • 402 Answers

SOURCE: boiler working but radiators cold

Seems that you may have bad circulation pump.

Posted on Feb 25, 2013

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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1 Answer

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1 Answer

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1 Answer

The hot water and central heating wont work together


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vailant boilers are one of the best on the market and should last you more than 6 years depending on installation and servicing.
the engineer you had should not have replaced the diverter valve if the boiler was firing up when the taps are opened. if you was getting luke warm water with the boiler alight it is a classic symptom of a blocked plate heat exchanger on the central heating side.
a new heat exchanger can cost around £100 depending on the age and model of the boiler.alteranatively it could be descaled but may clogg again. it would be a good ideal to fit a magna clean filter on the system to help prevent further debris if you have a dirty system .if you don't trust your engineer i suggest you ask another. find out if he is registered first and don't pay until you are satisfied with the work. if you are asking the same engineer back try and get a discount off the work as he has failed to rectifiy the original fault and fitted the wrong part due to wrong diagnostics. if he is registered you can complain to the governing body ie corgi or gas safe register.
good luck.

Jan 16, 2009 | Water Heaters

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