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For an error mode detected in outdoor unit, the fan operates because sub unit of a group operation does not communicate with the outdoor unit.
Wireless sensor
lamp display
Operation
Timer Ready
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Wired remote
controller
Check code
L09
L29
L30
L31
P03
P04
P10
P12
P19
P22
P26
P29
P31
No check code is displayed.
Diagnostic function
Cause of operation
Unset indoor capacity
Outdoor unit and other errors
• Communication error between CDB and IPDU
(Coming-off of connector)
• Heat sink temperature error
(Detection of temperature over specified value)
Abnormal outside interlock input
Phase detection protective circuit operates. (Normal models)
Fan motor thermal protection
Discharge temperature error
• Discharge temperature over specified value was detected.
High-pressure protection error by TE sensor
(Temperature over specified value was detected.)
Float switch operation
• Disconnection, coming-off, defective float switch contactor of float
circuit
Indoor DC fan error
Error in 4-way valve system
• Indoor heat exchanger temperature lowered after start of heating
operation.
Outdoor DC fan error
Inverter over-current protective circuit operates. (For a short time)
Short voltage of main circuit operates.
IPDU position detection circuit error
Own unit stops while warning is output to other indoor units.
Status of air
conditioner
Stop
Stop
Stop
Operation continues.
(Compressor stops.)
Stop
Stop
Stop
Stop
Stop
Stop
(Automatic reset)
Stop
Stop
Stop
Stop (Sub unit)
(Automatic reset)
Condition
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Judgment and measures
1. Set the indoor capacity. (DN=I1)
1. Check cables of CDB and IPDU.
2. Abnormal overload operation of refrigerating cycle
1. Check outside devices.
2. Check indoor P.C. board.
1. Check power phase order (Reversed phase)/phase missing.
2. Check outdoor P.C. board.
1. Check thermal relay of fan motor.
2. Check indoor P.C. board.
1. Check refrigerating cycle. (Gas leak)
2. Trouble of PMV
3. Check Td sensor.
1. Overload operation of refrigerating cycle
2. Check outdoor temperature sensor (TE).
3. Check outdoor CDB P.C. board.
1. Defect of drain pump
2. Clogging of drain pump
3. Check float switch.
4. Check indoor P.C. board.
1. Defective detection of position
2. Over-current protective circuit of indoor fan driving unit operates.
3. Lock of indoor fan
4. Check indoor P.C. board.
1. Check 4-way valve.
2. Check indoor heat exchanger (TC/TCJ) sensor.
3. Check indoor P.C. board.
1. Defective detection of position
2. Over-current protective circuit of outdoor fan driving unit operates.
3. Lock of outdoor fan
4. Check outdoor CDB P.C. board.
1. Inverter immediately stops even if restarted. : Compressor motor rare short
2. Check IPDU. : Cabling error
1. Position detection circuit operates even if operating compressor by
removing 3P connector. : Replace IPDU.
1. Judge sub unit while master unit is in [E03], [L03], [L07], [L08].
2. Check indoor P.C. board.