Service manual

G.Fire Service Manual 6 Issue A — © Masport, March 2004
D
— PILOT LIGHTS BUT WILL NOT REMAIN ALIGHT (Not ECS)
Does the
pilot remain alight?
1
2
3
NO
Y
ES
4
5
6
7
N
O
Disconnect the valve control rod (and adaptor if fitted), and operate
the valve directly.
Replace or service
the control rod
and re-test
Y
ES
Is the thermocouple
connection tight at
the control valve?
NO
Tighten connection
and re-test
Is the thermocouple
output at least 15 mV
when the pilot is alight?
Is the flame impinging
on the thermocouple?
8
Y
ES
Replace faulty control
valve and re-test
Ad
j
ust the pilot
flame size. Go to C11
Y
ES
Is there soot on
the thermocouple?
9 10
Replace thermocouple
and re-test
Y
ES
Clean thermocouple and ad
j
ust
pilot air mixture sleeve (*)
for cleaner pilot flame. Go to D3
11
(*) = Some models only
NO
NO