Service manual

G.Fire Service Manual 3 Issue A — © Masport, March 2004
OK
NO FLAME
Clean main
injector.
FAULTY
Check for gas
pressure at the
valve inlet
Faulty valve
OK
Faulty gas supply
FAULTY
7
10
8
9 12
11
Does the spark begin after a few seconds?
YES
NO
Fit jumper wire across
thermostat terminals.
Fault cleared?
Fire still won't light
after ten attempts?
Check wire connections and
earth return between burner
and valve. Verify ignition loom
plugs are firmly home. If still
no spark, check the spark
electrode insulation and
lead for cracks.
Faulty control box.
Faulty ignition module
Clean flame sensor
electrode and
check its wiring.
Turn on the flame switch on the side of the fascia
B
a
— EIS FIRE WON'T LIGHT AFTER REPEATED ATTEMPTS
Note: These fires have no standing pilot. The burner lights each time the heat is called for.
When operating correctly, the spark ceases as soon as the main burner flame is established.
FIRST:-
Check that the mains power supply and the gas supply are valid and that any gas valves are open
.
1
2
3
Does the spark cease after
about 30 seconds?
Faulty thermostat
or room too hot.
YES
YES
Normal
YES
NO
Still faulty?
If you are qualified,
check for a mains
signal from the
control box to the
ignition module on
the valve. See 7.3.8
YES
NO
SIGNAL
SIGNAL
4
5
6
13
14
15
16
17
18
19
Check for gas
pressure at valve outlet
Continue purging
air by ten further
starting attempts.
NO
Check for
wrong polarity
in phase and
neutral of
mains supply
3a
OK