17
3) Error Indications and Corrective Actions
Indication
(Timer time display
section)
Error (failure)
Corrective action
A1
RAM error
Replace the operation and display boards
A2
Frequency determination error
Replace the power supply board
A6
Watchdog error (main stop)
Watchdog error (interrupt stop)
Replace the operation and display boards
b1
Bus undervoltage error
Check the power supply
(Is the voltage appropriate?)
b2
Bus overvoltage error
b3
Power synchronization
Check the power supply
(Is there a noise generation source?)
C1
Current peak error when low
rotation speed
Disconnect and reconnect power plug and then
restart
* Leave the unit with the power plug disconnected
for at least 1 minute.
C2
Compressor synchronization
error
Check the compressor wire connections
(pin assignment and compressor connectors)
See "Does the compressor operate?" on page 13.
C3
Pre-start overcurrent error
Disconnect and reconnect power plug and then
restart
* Leave the unit with the power plug disconnected
for at least 1 minute.
C4
Post-start overcurrent error
CA
Current peak error when high
rotation speed
Cb
Current detection offset error
Replace the power control board
CE
Startup current detection error
Check the compressor wire connections
(whether connector disconnected)
E0
Room temperature thermistor
disconnected
Check the CN706 connection
Check the room temperature and humidity sensor
E1
Room temperature thermistor
shorted
E7
Tube temperature thermistor
disconnected
Check the CN707 connection
Check the tube temperature sensor
E8
Tube temperature thermistor
shorted
E9
%RDUG¿QWKHUPLVWRU
disconnected
Replace the power supply board
EA
%RDUG¿QWKHUPLVWRUVKRUWHG
Eb
Compressor temperature
thermistor disconnected
Check the CN709 connection
Check the capacitor temperature sensor
EC
Compressor temperature
thermistor shorted
F0
Blower fan locked
Check the CN701 connection
Check the blower fan
F2
Cooling fan locked
Check the CN701 connection
Check the cooling fan
F4
Tube temperature thermistor
temperature error (60°C or higher)
Check whether or not humidity described in
"Failure Diagnosis Flowchart"
Check the resistance of the tube temperature
thermistor
Fb
%RDUG¿QWKHUPLVWRUWHPSHUDWXUH
error (64°C or higher)
Check the operation of the cooling fan
&KHFNWKHUHVLVWDQFHRIWKHERDUG¿QWKHUPLVWRU
FC
Board mismatch
Replace the power supply board or operation and
display boards
Fd
Communication error
FE
Compressor temperature error
(110°C or higher)
Check whether or not humidity described in
"Failure Diagnosis Flowchart"
Check the resistance of the compressor
temperaturee thermistor
ņ
Communication error
Replace the power supply board
* When restarting, restart after the power plug has been disconnected for at least 1 minute.
