8
fault code has a description as to the cause of the problem in the workshop manual – read
this carefully.
N.B. there will be a time delay of between a few seconds and 3 minutes between the boiler
locking out and showing the self diagnostic fault code. The workshop manual shows each
component of the boiler, a functional description and the operating voltages where
applicable. By reading this information and testing before replacing components the
correct diagnosis can be reached ensuring that the wrong part is not replaced
unnecessarily.
Fault Finding Flow Diagrams (Pages 39 – 46)
These diagrams help diagnose problems that are not related to the safe operation of the
boiler and hence are not subject to the “lock –out” mechanism and the corresponding self
diagnostic fault code. The diagrams are to be used as a guide only and in conjunction with
the more detailed information on each component found elsewhere in the workshop
manual.
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