Panasonic 2WAY Multi - E31 Communication Failure between Units

IV–57
E31 Communication Failure between Units
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Error detection method
• When communications between the boards inside the outdoor unit is not possible for 30 seconds.
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Troubleshooting
1
Board check
1-1
Turn the power to the outdoor unit off and on. Does E31
reoccur after one minute?
Yes 4-3
No 1-2
1-2
Operate the engine for about 5 minutes with a trial run, etc.
Does E31 reoccur?
Yes 2-1
No 3-1
2
Ground
check
2-1 Is the outdoor unit grounded?
Yes 2-2
No Connect to ground
2-2
Is there any conduction between power control box and
ground wire connected to outdoor unit? (Check with a tester)
Yes 3 -1
No 4-2
3
Error history
check
3-1
Check the error history. Has E31 occurred frequently within a
short period of time?
Yes 4-3
No 4-1
4
Recovery
4-1
This could be the effects of random noise. Leave the situation as it is and keep it under
observation.
4-2
Polish the contacts with a wire brush, etc. to attain conduction between the electrical box and
ground wire connected to the outdoor unit.
4-3
Are there any poor connections, contacts, crimping or severed
wires between the outdoor unit’s power board connector 3P
(white) CN024 and the outdoor unit’s main board connector
3P (white) CN083?
Yes Repair Wiring
No 4-4
4-4 Is the outdoor unit a high-power model?
Yes 4- 5
No 4-9
4-5 Is LED: D044 on the converter assembly blinking?
Yes 4- 6
No 4-8
4-6
Are there any poor connections, contacts, crimping or severed
wires between converter ASSY3P (green) CN011 and the
outdoor unit’s power board 3P (green) CN012?
Yes Repair Wiring
No 4-7
4-7
Are there any poor connections, contacts, crimping or
severed wires between converter ASSY2P (red) CN016 and
the outdoor unit’s main board connector 2P (red) CNO20?
Yes Repair Wiring
No 4-6
4-8
Is DC250V or more being applied between the outdoor unit’s
power board 3P (green) CN012 1 and 3?
Yes 4-9
No 4-10
4-9
Replace the outdoor unit’s power board and keep an eye on the situation.
Replace the outdoor unit’s main board if E31 occurs again.
4-10 Replace the converter assembly and keep an eye on the situation.
● 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
GHPtroubleshooting.indbIV‒57GHPtroubleshooting.indbIV‒57 2012/11/2611:20:112012/11/2611:20:11