Cobra CB6, Service Manual, Page: 14 / 34

10
5
Fault Finding
Revision 2
© Moffat Ltd, August 2012
Cobra Series Gas Barbeque
Fault Possible Cause Remedy
Pilot won’t light. Gas pressure incorrect.
Pilot injector blocked / incorrect
size.
Piezo ignitor faulty.
(Refer Fault Diagnosis 5.2.1).
Check gas pressure and adjust if
necessary.
Check injectors and replace if
necessary.
Replace piezo ignitor.
(Refer Section 6.2.7).
Pilot drops out when knob
released.
Releasing knob before
thermocouple is heated.
Faulty thermocouple.
(Refer Fault Diagnosis 5.2.2).
Pilot injector blocked / incorrect
size.
Gas valve magnet faulty.
(Refer Fault Diagnosis 5.2.2).
Hold control in for longer, see if
pilot will stay alight.
Replace thermocouple.
(Refer Section 6.2.1).
Check injectors and replace if
necessary.
Replace gas valve magnet.
(Refer Section 6.2.10).
Pilot goes out when main burners
come on.
Incorrect gas pressure.
Faulty thermocouple.
(Refer Fault Diagnosis 5.2.2).
Faulty gas control valve.
Check supply / adjust pressure.
Replace the thermocouple.
(Refer Section 6.2.1).
Replace the gas control valve.
(Refer Section 6.2.9).
Main burners will not light. Wrong size or blocked injectors.
Faulty gas control valve.
Incorrect supply pressure.
Replace / clean injectors.
(Refer Section 6.2.6).
Replace the gas control valve.
(Refer Section 6.2.9).
Check supply correct pressure.
Burner goes out while in use. Incorrect or fluctuating gas
pressure.
Small pilot flame—pilot injector
blocked or incorrect size.
Main injector blocked / incorrect
size.
Check gas pressure and adjust if
necessary.
Check pilot injectors and replace if
necessary.
(Refer Section 6.2.2).
Check main injectors and replace if
necessary.
(Refer Section 6.2.6).
Burner flame incorrect colour
(yellow).
Burner aeration incorrectly set. Adjust the burner aeration.
Gas control valve stiff to operate. Gas control valve requires re-
greasing.
Re-grease the gas control valve.
(Refer Section 6.3.1).
5.1 Fault Finding Table
C
AUTION
:
All installation and service repair work must be carried out by qualified
persons only.