A08 Engine Stall - Panasonic 2WAY Multi Technical & Service Manual

A08 Engine Stall

Error detection method
During engine operation (complete combustion), when engine revolution speed ≤ 100min
seconds, the engine is stopped momentarily and an error fl ag is set.
An Engine Stall condition is assumed when the error fl ag has stopped the engine 5 consecutive times in 1 hour.
Troubleshooting
1
1-1 Has the fuel gas pressure dropped? Is the fuel empty?
Fuel
2
2-1 Measure compression (See A06 5-1).
Engine
Check 2-1 again after washing the valve and adjusting the valve
2-2 clearance.
Any problem with compression?
2-3 Is the air cleaner soiled? (Visual inspection)
2-4 Are spark emissions normal?
2-5 Inspect ignition plug (see A06 2-3)
Replace the ignition coil, cam angle sensor and crank angle sensor one by one to identify the
2-6
defective part.
2-7 Inspect the zero governor (see A06 3-1).
2-8 Is the ignition timing okay? (see Chapter 5 (9)).
2-9 Is air being sucked in? Check the rubber plug on the intake manifold.
Is 4V DC (approximately) being applied between outdoor unit's main
board connector 6P (black) CN066 No. 1 (+) and No. 2 (-)/No. 3
2-10
(-) and between No. 4 (+) and No. 5 (-)/No. 6 (-) when the power is
turned on (during positioning)?
Is DC voltage being applied between outdoor unit's main board
connector 6P (red) CN065 No. 1 (+) and No. 2 (-)/No. 3 (-) and
2-11
between No. 4 (+) and No. 5 (-)/No. 6 (-) when the power is turned on
(during positioning)?
Inspect the mixer's stepping motor (both the throttle and the fuel gas
2-12
adjustment valve.) Are any wires severed?
Are the throttle valve or fuel gas adjustment valves locked in place?
2-13 Is it possible to easily move each valve by hand with the stepping
motor removed?
3 There is a chance that the engine load could be unsuitable. Check the following, and make
Engine load repairs if problems are found.
check • Is the air fi lter on the indoor unit blocked? (Especially in the heater mode.)
• Has a short circuit occurred with the air on the indoor unit? (Especially in the heater mode
with the remote controller's thermostat.)
3-1
• Has a short circuit occurred with the air on the outdoor unit, or is the air heat exchanger on
the outdoor unit closed, etc.? (When in the cooler mode.)
• Is the refrigerant route blocked (strainer, dry core, etc.), is the valve closed (forgotten to open
closed valves, etc.,) or is the motor-operated valve locked in place?
• Has the refrigerant been over-fi lled?
● For work procedure for replacing outdoor main board, see "5. Reference Document".
● For board and Electrical Wiring Diagram, see Chapter 6.
• Outdoor main board: page VI-2
• Outdoor power board: page VI-3
• Converter board: VI-4
• Indoor control board for DC motor models: page VI-5
• Outdoor Unit Electrical Wiring Diagram: page VI-6
IV–12
-1
continuously for 3
OK 2-1
NG Restore
OK 2-3
NG 2-2
OK 2-3
Replace engine
NG
head
OK 2-4
Clean and
NG
Replace
Yes 2-7
No 2-5
OK 2-6
NG Replace
OK 2-8
NG Restore
OK 2-9
NG Adjust
OK 2-10
NG Replace
Yes 2-11
Replace the
No outdoor unit's
main board
Yes 2-12
Replace the
No outdoor unit's
main board
Replace the
Yes
stepping motor
No 2-13
Yes 3-1
No Replace mixer