102
H28 Outdoor unit heat
exchanger
temperature sensor 1
error
This error code is displayed when the outdoor unit heat exchanger temperature sensor
1 is below -58°C or 107°C or higher for 5 consecutive seconds.
<Points of diagnosis>
1. This is an error code displayed when an improbable temperature is detected.
If the sensor is not open (≥ 500kΩ) or short-circuited (≤0.5kΩ), poor contact of the
connector has occurred.
Outdoor unit heat
exchanger
temperature
sensor 1
(Bad connection /
detached
connector)
H29 Outdoor unit heat
exchanger
temperature sensor 2
error
This error code is displayed when the detected temperature of the outdoor temperature
sensor 2 is below -58°C or 107°C or higher for 5 consecutive seconds.
<Points of diagnosis>
1. This is an error code displayed when an improbable temperature is detected.
If the sensor is not open (≥ 500kΩ) or short-circuited (≤0.5kΩ), poor contact of the
connector or a failure of control board has occurred.
Outdoor unit heat
exchanger
temperature
sensor 2
(Bad connection /
detached
connector)
H33 Connection error of
the models with
different voltage
power supply
This error code is displayed when the models of indoor and outdoor units are different or
connected to 100V and 200V models, respectively.
This function does not apply to the case where the supply voltage of the indoor unit is
doubled.
<Points of diagnosis>
1. Check for the model compatibility between indoor & outdoor units; Check of supply
voltage.
1 200V indoor unit: When 100V or 200V is supplied and the outdoor unit is a 100V
model:
The indoor unit immediately turns off the power relay and H33 is displayed. After the
reset is cancelled, the power relay does not turn on if the indoor unit is a 200V
model.
2 Both indoor and outdoor units are 200V models and 100V power is supplied:
If the DC voltage of the outdoor unit is 180V or below after 20 seconds from power
relay ON, the signal is transmitted to the indoor unit. If the error occurs one more
time, H33 is displayed.
3 100V indoor unit: When 100V is supplied and the outdoor unit is a 200V model:
The indoor unit immediately turns off the power relay and H33 is displayed.
Model difference
between indoor &
outdoor units
Check of supply
voltage
H38 Brand not
corresponding
This error code is displayed when the connection is different between the indoor and
outdoor units.
<Points of diagnosis>
1. Check of models and capabilities of indoor and outdoor units.
2. Short-circuit of CN-S on outdoor unit control board.
Models of indoor
and outdoor units
H53 Aluminium Electric
Heater (Heatcharge)
sensor abnormality
When the Aluminium Electric Heater (Heatcharge) sensor detects less than -47°C, or, at
or more than 190°C for 5 seconds.
<Points of diagnosis>
Abnormality display when detecting an unusual temperature. Check the sensor; it might
be connection abnormality of the connectors and PCB abnormality, if the sensor is not
open (at or more than 500kΩ) or short (0.6kΩ).
Aluminium
Electric Heater
(Heatcharge)
sensor (wire cut /
short)
H54 Abnormality in
Aluminium Electric
Heater (Heatcharge)
circuit
After 6 seconds from switching on the outdoor unit, the total amperage value is judged
to be abnormal.
<Points of diagnosis>
1. Check the Aluminium Electric Heater (Heatcharge): short circuit.
2. Check PCB: only check Aluminium Electric Heater (Heatcharge): change PCB if the
circuit is open.
Aluminium
Electric Heater
(Heatcharge)
Outdoor unit PCB
H59 Infrared sensor error This error code is displayed when the infrared sensor shows no response within 30
seconds after it is ON or continuously responds between 80 and 250 seconds after it is
ON.
<Points of diagnosis>
1. Check of the detection and location of the infrared sensor.
2. Check for disconnection and detached infrared sensor.
Infrared sensor
(Bad connection /
disconnection /
detached
connector)
H67 Nano-e abnormality Detection of wire cut
When the main PCB receives abnormal signal from Nano-e control PCB after 1 to 7
seconds subsequent to switching on Nano-e, power supply to Nano-e is stopped for
5 minutes and re-started after that.
Having repeated this procedure for 3 times, Nano-e abnormality is detected.
PBC
Nano-e system
High voltage device
H70 Sunlight sensor error When 24-hour disconnection is detected for 15 consecutive days, the diagnosis code
“H70” is displayed on the indoor unit and ECONAVI LED is OFF. (The air conditioner
continues the operation.)
<Points of diagnosis>
1. Failure of the sunlight sensor.
2. Detached sunlight sensor connector.
Sunlight sensor
(Bad connection of
connector)
H80 Aluminium Electric
Heater (Heatcharge)
3-way valve sensor
abnormality
When wire cut or short circuit of Aluminium Electric Heater (Heatcharge) 3-way valve is
repeatedly detected in continuous 5 seconds, the power relay is stopped for 2 minutes,
and after re-starting, the wire cut or short circuit is detected in 5 continuous seconds
within 10 seconds, the timer lamp blinks (the operation is continued).
<Points of diagnosis>
1. This is an abnormality indication of unusual temperature detection. Check the
sensor, and if the sensor is not open or shorted, improper connector connection or
PCB defect is suspected.
Aluminium
Electric Heater
(Heatcharge)
3-way valve sensor
(connector
connection
abnormality/
detachment)
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