I have a vailllant VCW GB 282E and the hot water and the heating do not work. I havnt had the boiler on for the heating since about march and the hot water has been running fine untill recently. The burner doesnt ignite but once in a blue moon it does but will only last for around 3 minutes. The hot water doesnt work at all at the minute. The servo valve is moving when the hot water tap is turned on and the micro switch turns everything on but no spark. i have swapped the whole electric system with another from a known working combi and the fault is still the same! i have tested the ignition unit and it works fine. I really could do with a hot shower! i called out an engineer and he looked at it and was stumped! it has to be something small for everything else to be working fine! even a manual might help. tried through vaillant website, what a stupid system!

Cold showers r us!, October 2010

thanks for the reply. i will have a look at these things 2nite when i get home from work and see what i can find.

cold showers r us!, October 2010

You are starting from the wrong end. EVERY Vaillant boiler fault find is started on the CH NOT HW side.

If the appilance doesn't attempt ignition, the procedure on a VCW goes as follows, this is ONLY a brief synopsis of the basics:

Does fan run?
Does pump run?
Does microswitch M2 make? (bottom of diverter pair)
Does FPS make?
Does PD valve operate?
Does appliance attempt ignition?
Is there 20vdc across solenoid?

I suggest you get an RGI with some experience on VC/VCW to try to repair. Try Vaillant themselves, I've heard they're quite handy on repairing these.

Carefree, October 2010