E31 Communication Failure Between Units - Panasonic 2WAY Multi Technical & Service Manual

E31 Communication Failure between Units

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