13.2. SELF DIAGNOSIS DISPLAY
13.2.1. Indoor Unit
[Table of diagnosis methods]
Symbol Diagnosis Diagnosis method
H11 Indoor/Outdoor
abnormal
communication
This trouble display appears when indoor/outdoor unit communication fails to be established after 30 or more
seconds.
<Diagnosis checkpoint>
1. Measure the voltages of the indoor/outdoor unit communication cables, and check whether the voltage is
being supplied properly to the outdoor unit or whether it is being returned from the outdoor unit to the
indoor units.
H12 Indoor unit capacity
unmatched
This trouble display appears when wrong in the total connection capacity and wrong connection in each
capacity.
The trouble is determined within 2 minutes after the power is turned on.
<Diagnosis checkpoint>
1. Check the total capacity of the units connected and check that the models are compatible for connection.
H14 Intake air temp.
sensor
This trouble display appears when the intake air temperature has exceeded above 46 °C continuously for 2
minutes or dropped below -54 °C continuously for 5 seconds during operation.
<Diagnosis checkpoint>
1. This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
Check the sensor, and if open-circuiting (more than 500 kΩ) or short-circuiting (less than 6.5 kΩ) is not
found, defective contact of the connector is to blame.
H16 Outdoor Current
Transformer
CU-2E:
When a value of under 1.5A has been detected for the total current during operation beyond the set capacity,
the compressor operates with its operating frequency controlled to a maximum of 38 Hz for 3 minutes, and if
it continues to operate at a total current of under 1.5A for another 3 minutes, its operation stops.
CU-3E/4E:
When the total current has dropped below the set current level continuously for 20 seconds during operation
beyond the set capacity, operation is stopped. Three minutes later, operation is started up again, and when the
trouble occurs on 4 successive occasions, the trouble display appears (the timer lamp blinks).
<Diagnosis checkpoint>
1. Check the refrigerating cycle: Gas may be leaking (the amount of refrigerant is extremely low).
2. Check the control P.C. Board: Check for a broken wire (open circuit) in the current transformer. (If an open
circuit is found, replace the control P.C. Board.)
In the case of a scroll compressor (DC motor), H16 is detected only when the regular compressor is
operating.
H19 Indoor fan motor
mechanism lock
·
High-voltage PWM: When a state in which the fan motor speed is not synchronized with the control signal
has been detected on 7 successive occasions:
·
Low-voltage PAM: When the fan lock detection signal has been detected on 7 successive occasions or it
has been detected continuously for 25 seconds or when a state in which the fan motor speed is not
synchronized with the control signal has been detected on 7 successive occasions:
The trouble display appears (the timer lamp blinks).
<Diagnosis checkpoint>
1. Check the nature of the fan lockup trouble.
2. Check for disconnections of the fan motor connectors and for defects in contact, in the fan motor and in
the control P.C. Board.
H23 Indoor heat
exchanger temp.
sensor
This trouble display appears when a temperature of under approximately -40 °C or above approximately 80 °C
has been detected by the heat exchanger temperature sensor continuously for 5 seconds.
(This trouble is not detected during de-icing.)
<Diagnosis checkpoint>
1. This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
Check the sensor, and if open-circuiting (more than 500 kΩ) or short-circuiting (less than 2.5 kΩ) is not
found, defective contact of the connector or a defective control P.C. Board is to blame.
H27 Outdoor air temp.
sensor
This trouble display appears when a temperature of under approximately -40 °C or above approximately 150
°C has been detected by the outside air temperature sensor for 2 to 5 seconds. (This trouble is not detected
during de-icing.)
<Diagnosis checkpoint>
1. This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
Check the sensor, and if open-circuiting (more than 500 kΩ) or short-circuiting (less than 0.5 kΩ) is not
found, defective contact of the connector or a defective control P.C. Board is to blame.
H28 Outdoor heat
exchanger temp.
sensor 1
This trouble display appears when a temperature of under approximately -60 °C or above approximately 110
°C has been detected by the heat exchanger temperature sensor for 2 to 5 seconds. (This trouble is not
detected during de-icing.)
<Diagnosis checkpoint>
1. This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
Check the sensor, and if open-circuiting (more than 500 kΩ) or short-circuiting (less than 0.5 kΩ) is not
found, defective contact of the connector or a defective control P.C. Board is to blame.
82
CS-ME7CKPG / CS-ME10CKPG / CS-ME12CKPG / CS-ME14CKPG / CS-ME18CKPG / CU-2E15CBPG / CU-2E18CBPG / CU-3E23CBPG / CU-4E27CBPG
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