Advertisement
2-2-4. Check Code Diagnosis
The system can store and recall any of a predetermined selection of codes which can indicate associated electrical
or refrigeration faults.
Diagnosis by the check codes is conducted with procedures shown below.
a) Enter the service mode and make sure the off timer display of the remote control shows
"
".
b) Operate the "ON/OFF" key and make sure the timer lamp on the display section is flashing (5 Hz).
c) Next press the Temp
the displayed check code matches the code on the indoor unit. The operation L.E.D will light and the HEX code
shown should be looked up in the following tables.
d) If other buttons on the remote are pressed in the service mode, the display will change as shown in the table below.
This option enables check code numbers to be quickly reached.
e) Fault codes can only be retrieved for the first unit if multiple units are wired in a group, therefore group operation is
not recommended.
Operating key
ON/OFF
TEMP.
TEMP.
"AUTO" LOUVER
"SET" LOUVER
2-2-5. List of Check Codes
DIAGNOSTIC FUNCTIONS
CHECK CODE
ROOM TEMP.
SENSOR (TA).
Out of place, break,
short-circuit.
INDOOR
HEAT-EXCHANGER
SENSOR (TC).
Out of place, break,
short-circuit.
RETURN SIGNAL
NOT COMING TO
INDOOR
1) Wrong wiring in connecting
cable (serial signal).
4-WAY VALVE
SYSTEM
1) Indoor heat-exchanger
temperature rises, after
starting cooling operation.
2) Indoor heat-exchanger
temperature drops after
starting heating operation.
key and the displayed HEX code will increase by one. The receiver will then beep. When
(Up)
(Down)
STATUS OF AIR
SYMPTON
CONDITIONER
Operation
continuing
Operation
continuing
Operation
continuing
Operation
continuing
Indication after operation
The display code is increased by
"1".e.g.
The display code is decreased by
"1".e.g.
The display code is increased by
16 e.g.
The display code is repeated
e.g.
JUDGEMENT AND ACTION
1. Check the indoor temp. sensor.
2. Check the indoor PC board.
1. Check the indoor heat-exchanger sensor.
2. Check the indoor PC board.
1. If outdoor unit does not work at all.
(1) Check the connecting cable correct wrong wiring.
(2) Check the outdoor PC board.
2. If operates normally.Between indoor terminal
plates 2 and 3, return signal is:
Available:
Check the indoor PC board.
Not available: Check the outdoor PC board.
1. Check the 4-way valve.
2. Check the 2-way valve and check valve.
3. Fault with indoor heat exchanger sensor.
4. Check the indoor PC board.
5. Two systems may be cross wired.
-15-
Advertisement
