Sharan aux heater........again!

[david muir]

Hi folks,
Just changed aux heater glowplug (with new one from VW) having interrogated VagCom beforehand..........now VagCom doesn't seem to 'see' the aux heater!! Could it be the fuse or has the system got confused after disconnecting the aux heater electrics?
Thanks

[david muir]

Traced fault to corroded/broken live feed-now fixed. Vagcom then 'saw' aux heater and I cleared all error codes...........aux heater still doesn't fire up although there is fresh diesel now coming from heater exhaust! Any ideas?
thanks

PS fuses 5,12 &19 are okay!