10.2. Error Code
Symbol Diagnosis Diagnosis method
H11 Indoor / Outdoor
abnormal
communication
This trouble display appears when indoor/outdoor unit communication fails to be established after 30 seconds or
more.
<Diagnosis checkpoint>
1. Measure the voltage 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-circulating (more than 500k ohms) or short-circulating (less than 6.5k ohms)
is not found, defective contact of the connector is to blame.
H16 Outdoor Current
Transformer
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-circuited) in the current transformer. (If the
open-circuited 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.
H21 Indoor float switch
abnormality
Error appears when the float switch is open for 150 seconds.
<Diagnosis checkpoint>
1. Drain blockage
2. Check the conductivity of float switch.
3. Check that the resistance of the drain motor is about 200 ohms.
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 500k ohms) or short-circuiting (less than 2.5k ohms) 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 outdoor 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 500k ohms) or short-circuiting (less than 0.5k ohms) 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 500k ohms) or short-circuiting (less than 0.5k ohms) is
not found, defective contact of the connector or a defective control P.C. Board is to blame.
89
CS-ME7DKEG CS-ME10DD3 EG / CS-ME10DTEG CS-E15DB4EW
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