Sanyo KH2442 / CH2442 Service Manual page 163

Possible Cause of Malfunction
Thermistor
Indoor thermistor is either open
failure
or damaged.
Outdoor thermistor is either
open or damaged.
EEPROM (ICB of PCB) failure
Fault with
Protective device for comp. is
comp. and its
activated.
circuit
Possible cause of Malfunction
Model setting of indoor unit is not matching the outdoor unit.
When using group control, main indoor unit address setting is duplicated.
(Judging by indoor unit.)
Outdoor unit address (R.C. No.) is duplicated.
Priority setting of indoor unit is duplicated.
Improper wiring between indoor units.
(There is group connection wiring in case of individual control.)
Capacity code of indoor unit is not set.
Improper wiring of group control wiring.
Possible Cause of Malfunction (The following messages are displayed only for the system controller.)
• Serial
System controller is transmitting
commu-
incorrect signal.
nication
errors
System controller is detecting
• Mis-setting
incorrect signal.
Protective device of the sub-
Activation of
indoor unit is activated in group
protective
contorl.
device
NOTE
R.C. : Refrigerant Circuit
comp. : Compressor
temp. : Temperature
PCB : Printed Circuit Board
Indoor coil temp. (E1 = TH1) cannot be detected.
Indoor coil temp. (E2 = TH2) cannot be detected.
Indoor coil temp. (E3 = TH3) cannot be detected.
Indoor room (air-intake) temp. can not be detected.
Discharge gas temp. (comp. = TH0A) cannot be detected.
Outdoor coil gas temp. (C2 = TH0C) cannot be detected.
Outdoor coil liquid temp. (C1 = TH0D) cannot be detected.
Comp. motor is overloaded.
Comp. motor is locked.
Current of comp. cannot be detected when it is turned on.
Current of comp. is detected when it is not operated.
Comp. contactor (Mg SW) is chattering.
—
• Indoor or outdoor unit is not working correctly.
• Control lines between indoor unit, outdoor unit, and system
controller are not wired correctly.
• Same as for C05, above.
• Connector CN1 is not connected correctly.
When using wireless remote controller or system controller,
connect wired remote controller with the indoor unit temporarily
to check the alarm message in detail.
IV - 7
4. Service procedures
Alarm
message
F1
F2
F3
F10
F4
F25
F7
F29
H1
H2
H3
F27
H18
Alarm
message
L2
L3
L4
L5
L6
L7
L9
L11
Alarm
message
C05
C06
P30
SM830082
Section
1
2
3
4