Daikin ALTHERMA HT Service Manual page 139

ESIE09-08B
Malfunction Operation
code lamp
A1
A6
A9
AJ
C1
C4
C5
C9
CA
CJ
E1
E3
E4
E5
E6
E7
E9
F3
H9
J2
J3
J5
J6
J7
J9
JA
JC
L1
L4
L5
L8
L9
LC
P1
PJ
System U0
U2
U4
U5
U5
U7
U8
UA
UF
UH
The system operates for malfunction codes indicated in black squares, however, be sure to check and repair.
Troubleshooting
PC board defect, E
c
Pump error
c
Malfunction of moving part of electronic expansion valve (Y1E)
c
Malfunction of capacity setting
c
Failure of transmission (between indoor unit PC board and fan PC board)
c
Malfunction of thermistor (R3T) for R-410A liquid/indoor unit (loose connection,
c
disconnection, short circuit, failure)
Malfunction of thermistor (R2T) for tank thermistor (loose connection,
c
disconnection, short circuit, failure)
Malfunction of thermistor (R4T) for return water thermistor (loose connection,
c
disconnection, short circuit, failure)
Malfunction of thermistor (R5T) for leaving water temperature (loose connection,
c
disconnection, short circuit, failure)
 Malfunction of thermostat sensor in remote control
PC board defect
c
Actuation of high pressure switch
c
Actuation of low pressure sensor
c
Compressor motor lock
c
Standard compressor lock or over current
c
Malfunction of outdoor unit fan motor
c
Malfunction of moving part of electronic expansion valve (Y1E, Y3E)
c
Abnormal discharge pipe temperature
c
Malfunction of thermistor (R1T) for outdoor air (loose connection, disconnection,
c
short circuit, failure)
Current sensor malfunction
c
Malfunction of discharge pipe thermistor (R2T, R6T) (loose connection,
c
disconnection, short circuit, failure)
Malfunction of thermistor (R3T, R5T, R7T) for suction pipe (loose connection,
c
disconnection, short circuit, failure)
Malfunction of thermistor (R6T) for heat exchanger (loose connection,
c
disconnection, short circuit, failure)
Malfunction of thermistor (R7T) for outdoor unit liquid pipe
c
Malfunction of subcooling heat exchanger gas pipe thermistor (R4T)
c
Malfunction of high pressure sensor IU/OU
c
Malfunction of low pressure sensor IU/OU
c
Malfunction of PC board
c
Malfunction of inverter radiating fin temperature rise
c
Inverter compressor abnormal
c
Inverter current abnormal
c
Inverter start up error
c
Malfunction of transmission between inverter and control PC board
c
High voltage of capacitor in main inverter circuit.
c
Faulty combination of PCB
c
Low pressure drop due to refrigerant shortage or electronic expansion valve

failure
Power supply insufficient or instantaneous failure
c
Malfunction of transmission between indoor and outdoor unit
c
Malfunction of transmission between remote control and indoor unit
c

Failure of remote control PC board or setting during control by remote control
Malfunction of transmission outdoor unit
c
Malfunction of transmission between main and sub remote controls (malfunction of
c
sub remote control)
Communication error between outdoor unit and indoor unit
c
System is not set yet
c
Malfunction of system, refrigerant system address undefined
c
Malfunction contents
2
PROM defect
Troubleshooting by Remote Control

: ON : OFF c: Blink
Page
Referred
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