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page 11
Contact the Gas
Supplier
Fire satisfactory
Change the electro
magnetic unit
Change pilot
assembly
Does
the fire remain
alight ?
Is
thermocouple
tip
clean ?
Is
thermocouple
connection
sound ?
Is
thermocouple
output
within limits ?
Is
meter pressure
correct ?
YES
NO
NO
YES
YES
NO
Pipe restricted or
undersized
Is
supply pressure
correct ?
NO
YES
NO
YES
NO
YES
YES
NO
YES
Are
gas cocks fully
open ?
Is
thermocouple
tip
sound ?
NO
YES
Is flue
blocked causing
A.S.D. to
operate ?
YES
NO
Open gas cocks
Clean
thermocouple tip
Change pilot
assembly
Make good the
connection
Rectify flue
Is
pilot flame
stable and approx
40mm long ?