Firebird 1997 combi 90, cannot turn off central heating?

HI, i'm an oftec engineer, and have worked on many firebirds, indeed i have a 2010 heatpac external at home.
your fault sounds like the circuit board behind the control panel is faulty. i've seen the same fault a few times.
call firebird in ivybridge, plymouth, they have a good aftersales team.
As for continually locking out, try pulling out the photocell on the burner, it looks very much like a spark plug cap, and check the electronic photosensetive 'eye' on the end isnt sooted up. this will cause lockouts.
A lockout will always be a fuel or ignition fault, so check your tank-or inline- oil filter isnt blocked,and that there is no water in the fuel, but a worn out riello RDB/G5 oil pump can also be to blame.

mark properjob
February 2012