Troubleshooting; Error Codes And Description - Daikin B-Series Service Manual

Si04-306E
4.

Troubleshooting

4.1

Error Codes and Description

System
Indoor
Unit
Outdoor
Unit
Service Diagnosis
Code Indication Description
00
Normal
U0★
Insufficient gas
U2
Low-voltage detection
U4
Signal transmission error (between indoor and outdoor units)
A1
Indoor unit PCB abnormality
A5
Freeze-up protection control or high pressure control
A6
Fan motor or related abnormality
C4
Heat exchanger thermistor abnormality
C9
Room temperature thermistor abnormality
E5★
OL activation (compressor overload)
E6★
Compressor lock
E7
DC fan lock
E8
Input over current detection
EA
Four way valve abnormality
F3
Discharge pipe temperature control
F6
High pressure control in cooling
H6
Position sensor abnormality
H8
CT or related abnormality
H9
Outdoor air thermistor or related abnormality
J3
Discharge pipe thermistor or related abnormality
J6
Heat exchanger thermistor or related abnormality
L3
Electrical box temperature rise
L4
Radiation fin temperature rise
L5
Output over current detection
P4
Radiation fin thermistor or related abnormality
★
: Displayed only when system-down occurs.

Troubleshooting

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