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first no hot water , now no heating vaillant 282e?

is there muck in the tubes of the pressure switch or is it the micro switch for that white arm behind the pump.
startup sequence is all ok until ignition spark but no flame ????????????????????????????????????????/
phill Venables, November 2009
I think you are right, there is scale on the diafragm on the diverter valve (pressure switch that has 2 microswitches atached), you should use domestic acid to clean it up, I just had similar problem

guido, November 2009
if its trying to ignite then perhaps no gas getting up to burner which could mean faulty gas valve an engineer can diagnose this in a few mins with u gauge attached to gas valve

sean, November 2009
link Click here to see other fixes for Vaillant.