– 64 –
Check
code
Block distinction
Check
Block
code
Indoor P.C.
board etc.
Connecting
cable and
serial signal
11-4-2. Caution at Servicing
1. After servicing, push the START/STOP button to return to the normal mode.
2. After servicing by the check code, turn off breaker of the power supply, and turn on breaker of the power
supply again so that memory in the microcomputer returns the initial status. However, the check codes are
not deleted even if the power supply is turned off because they are stored in the fixed memory.
Table 11-4-1
Operation of diagnosis function
Cause of operation
Short-circuit or
disconnection of the
room temperature sensor
(TA sensor).
Being out of place,
disconnection,
short-circuit, or migration
of heat exchanger
sensor (TC sensor).
Being out of place,
disconnection,
short-circuit, or migration
of heat exchanger
sensor (TCJ sensor).
Lock of indoor fan or
trouble on the indoor fan
circuit.
Float SW operation
Trouble on other indoor
P.C. boards
Return serial signal is
not sent to indoor side
from operation started.
1) Defective wiring of
connecting cable
2) Operation of
compressor thermo.
Gas shortage
Gas leak
Air
conditioner
status
Operation
continues.
Operation
continues.
Operation
continues.
All off
Operation
continues.
(Outdoor
units stop.)
Operation
continues.
Operation
continues.
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.
Flashes when
trouble is detected
on return serial
signal, and normal
status when signal
is reset.
Judgment and action
1. Check the room temp. sensor.
2. When the room temp. sensor is
normal, check P.C. board.
1. Check heat exchanger sensor.
2. When heat exchanger sensor is
normal, check P.C. board.
1. Check heat exchanger sensor.
2. When heat exchanger sensor is
normal, check P.C. board.
1. Che P.C. board.
2. When P.C. board is normal, check
the motor.
1. Check the drainage.
1) Amount of residual drain.
2) Drain water piping installation
situation.
2. Float SW operation check
3. Check disconnection of connector.
Replace P.C. board.
1. When the outdoor unit never
operate:
1) Check connecting cable, and
correct if defective wiring.
2) Inverter check
2. To display [Other] block during
operation, check compressor
thermo. operation and supply gas
(check gas leak also).
3. Unit operates normally during
check.
If return serial signal does not
stop between indoor terminal
board 2 and 3, replace inverter
P.C. board.
If signal stops between indoor
terminal board 2 and 3, replace
indoor P.C. board.
Summary of Contents for RAS-M10SMUCV-E
Page 71: ... 71 11 7 P C Board Layout ...
