Vaillant VCW GB 282 EH fault?

The boiler comes on in heating mode,warms up perhaps 10 mins, then shuts down with pump running,but does not fire up again unless switched off and then back on again, has anybody any ideas please.

Mike
March 2016

If one of the 2 amp fuses is blowing, it's one of three things:
Pump
Fan
Motherboard

Put a new fuse in, before running anything try the following:
Using a multimeter, look at the terminal block, terminal 9 to the boiler chassis should give you a reading of 15-25vdc, if it does, it verifies the motherboard, fuses, transformer, bridge rectifier and low voltage circuits are okay.
If the above is the case, you can try the windings on the pump and fan for resistance across the windings (L&N).
Simplier methods are to disconnect both pump and fan wiring COMPLETELY and start the boiler in a process of elimination connecting one thing at a time, the answer will soon become clear.

Carefree
April 2011

ok, of the 3 fuses on the front panel, the T2a one has blown, i replaced it and the power was back, I tried the water, it instantly blew again, I have also checked that the pump runs freely and it does, anybody help please....

Mark Clays
April 2011

cheers mate, going home at dinner to sort it, i will feed you more info then, thanks for giving me a head start, hope you're about later, cheers.

Mark Clays
April 2011

The fuses are 2amp (L&N) on the left, and an anti-surge fuse 0.16amp on the right.
You need to check these fuses to see if any have blown?
If the boiler seems ready to run but won't, try the overheat reset button (right hand side, black box behind the pump).
To answer with more detail you need to give more information as to the fuses, state of the power supply etc.

Carefree
April 2011