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How can I fix my vaillant ecoTEC PLUS 837?

Becouse of an emergency we had to turn off the house water tap. After resolving the problem I turn it on but I cannot get the boiler to work. I have a Vaillant ecoTEC plus 837 combi boiler and it is showing me the code F.22. What can I do?
Beatriz, February 2010
flashing radiator symbol

Dean, October 2015
Thanks for this info - we also now have hot water!

Nice hot shower, September 2013
Getting luke warm water, and heating has stopped working. checked panel, I have a flashing radiator sign. When I pressed i, the code is S.8.

Can anyone help?

Kadeem, April 2010
Tony...you are a living legend...we now have hot water and heating!

Thanks to your two knob advice the world (or at least my house) is a warmer place!

: D

Doc, April 2010
put both hands under the boiler and you will locate two switches facing downwards .turn the one in your right hand as far as it goes 90 degrees and then slowly open the one in your left hand.you will hear water running and the pressure arrow moving up.when it is about half way up the grey zone and before it goes into the red close left one up and then return right one to itsoriginal position.hopefully you will then be ok for hot water and heat

tony, February 2010
link Click here to see other fixes for Vaillant.