Panasonic 2WAY Multi - A03 Engine High-Revolution Error

IV–5
A03 Engine High-Revolution Error

Error detection method
Engine revolution speed is,
45.0 ~ 71.0 kw models
• Engine revolution speed is more than 2,300min
-1
continuously for 30 seconds
• Engine revolution speed is more than 2,400min
-1
continuously for 10 seconds
• Engine revolution speed is more than 2,500min
-1
continuously for 1 second
85.0 kw models
• Engine revolution speed is more than 2,700min
-1
continuously for 30 seconds
• Engine revolution speed is more than 2,800min
-1
continuously for 10 seconds
• Engine revolution speed is more than 2,900min
-1
continuously for 1 second
If any of above conditions occur, the engine stops momentarily and an error fl ag is set. An Engine Speed Too
High trouble is assumed when the error fl ag has stopped the engine 5 consecutive times in 1 hour. ”
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Troubleshooting
1
Check
revolution
speed
1-1
Measure actual revolution speed using a revolution meter. Was there
high revolution when the error occurred?
Yes 2-1
No 4-1
2
Mixer
2-1 Is the throttle valve locked or sticking?
Yes Repair
No 3-1
3
Compressor
3-1 Does the compressor have any reason for abnormally low load?
OK 5-1
NG Restore
4
Ignition
pulse
4-1 Ignition coil, cam angle sensor, and crank angle sensor
5
Wiring
5-1
• Any poor connections, poor contact or broken wires between
throttle (step motor) wiring and connector? (Wiring from outdoor
main board connector 6P (black) CN066 to throttle (step motor))
• In the relay part, is the wiring for the throttle (step motor) and fuel
regulating valve crossed?
Yes
Reset the power
after repair wiring
No 6-1
6
Mixer 6-1
Does the throttle (step motor) coil resistance measure about 120Ω?
(Disconnect relay connector 6P-1, and measure between No. 1 (red)
and No. 2/No. 3, and between No. 4 (orange) and No. 5/No. 6.)
Yes 6 -2
No Replace mixer
6-2
Is 4 V DC applied between control board connector 6P (black)
CN066 No. 1 (+) and No. 2 (-)/No. 3 (-) as well as between No.
4 (+) and No. 5 (-)/No. 6 (-) when turning the power ON (during
positioning)?
Yes Replace mixer
No
Replace outdoor
main board
● 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
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