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A06 Engine Start Failure
Error detection method
When the engine will not start despite cranking being carried out 30 times (revolution speed detected) during
engine start-up (cranking = 5 seconds ON, 10 seconds OFF.)
* Enforced pauses of 3 minutes every 5 cranks and 10 minutes every 15 cranks are in effect.
Troubleshooting
1
Has the fuel gas pressure dropped? Is the fuel empty? Measure the
1-1
Engine
pressure at the gas pressure measuring port during cranking.
Is the gas solenoid valve SW (S002 on the outdoor unit's main board)
1-2
set at NORM?
2
Are spark emissions normal? (Remove plug and check outside. Or,
2-1
Plug
check with a timing light.)
Are there any poor connections, poor contacts, poor crimping or
2-2
severed wires between the ignition wiring and the outdoor unit's main
board connector 6P (white) CN010 and 6P (black)/CN011?
2-3 Inspect ignition plug.
3
Zero
3-1 Inspect zero governor.
governor
4
Is DC180V being applied between the fuel gas solenoid valve relay
Gas
4-1
connector 4P-1 (white) No. 1 (+) and No. 2 (–) and between No. 3 (+)
solenoid
and No. 4 (–) during cranking?
valve/Gas
Is DC180V or more being applied between the fuel gas solenoid
adjustment
4-2
valve coil terminals during cranking?
valve
(See 4-4 for gas-type C models.)
Are there any poor wiring connections, crimping or severed wires
4-3
between the fuel gas solenoid valve relay connector 4P-1 (white) and
the solenoid valve?
Are fuel gas solenoid valve operations malfunctioning?
4-4
(Check for coil breakage, foreign matter, fuel gas passage blockages,
etc.)
Are the throttle (step motor) and fuel gas regulating valves operating
4-5
normally?
5
5-1 Measure compression.
Engine
Check 6-1 again after washing the valve and adjusting the valve
5-2
clearance. Any problem with compression?
5-3 Is the air cleaner soiled? (Visual inspection)
5-4 Has the ignition timing been adjusted?
6
Is 180V DC being applied between the outdoor unit's power board
Solenoid
6-1
connector 7P (white) CN041 pin 1 (+) and pin 3 (–) and between pin 5
valve wiring/
(+) and pin 7 (–) during cranking?
circuit board
Are there any poor connections, contacts, crimping or severed wires
6-2
between the outdoor unit's power board connector 7P (white) CN041
and the fuel gas solenoid valve relay connector 4P-1 (white)?
Is 200V AC being applied between the outdoor unit's power board
6-3
connector 3P (white) CN002 No. 1 to No. 3?
IV–9
OK
2-1
NG 1-2
Yes 4-1
No
Set SW at NORM
Yes 3-1
No
2-2
Yes Repair Wiring
No
2-3
OK
7-1
NG Replace plug
OK
5-1
NG Restore
Yes 4-2
No
6-1
Yes 4-4
No
4-3
Yes Repair Wiring
No
4-4
OK
4-5
Repair
NG
(or replace)
OK
5-1
NG Replace
OK
5-3
NG 5-2
OK
5-3
Replace engine
NG
head
OK
5-4
NG Clean/replace
Yes 6-1
No
Adjust
Yes 6-2
No
6-3
Yes Repair Wiring
No
6-3
Replace the
Yes
outdoor unit's
power board
No
6-4
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Troubleshooting
