FER falcon
GCN 47-267-01
DHW OK
NO CH?
does CH indicator light up on demand?
if yes
CH sensor faulty
if no
most likely cause defective internal timer [if fitted]
can be bypassed & linked out to test if timer faulty
manwithnoname, April 2012
edit
I can answer this question...
my hot water is working but the central heating is not help?