Self Diagnosis Functions And Points Of Diagnosis - Panasonic CS-VE9NKE Service Manual

15.3 Self Diagnosis Functions and Points of Diagnosis

[List of Diagnosis Method]
Code Name of Diagnosis
Codes for the
commencement of
—
self diagnosis
No memory of error
H00
code
H11 Indoor/outdoor
communication error
H14 Indoor unit intake air
temperature sensor
error
H15 Compressor
temperature sensor
error
H16 Outdoor unit CT
disconnection error
H19 Indoor unit fan motor
lock error
H23 Indoor unit heat
exchanger
temperature sensor
error
H27 Outdoor temperature
sensor error
H28 Outdoor unit heat
exchanger
temperature sensor 1
error
When the indoor/outdoor communication failed for 15 seconds or more, the power relay
is OFF for 2 minutes. Then, determine the presence of the error again. The error code is
displayed when the error is detected two times. (No communication error is determined
for 1 minute after the operation is started or the power relay is ON.)
<Points of diagnosis>
1. The model and supply voltage of the indoor and outdoor unit are checked.
2. Ensure that the control board of the outdoor unit is working.
3. The voltage of indoor/outdoor communication line, the supply voltage of the outdoor
unit and the return voltage from outdoor to indoor unit are checked.
This error code is displayed when the detected temperature of the intake air
temperature sensor is below -50°C for 5 consecutive seconds, or 149°C or higher for 2
consecutive minutes after 20 minutes have elapsed since the air conditioner is turned
on.
<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 (≤6.5kΩ), poor contact of the
connector has occurred.
This error code is displayed when the detected temperature of the compressor
temperature sensor is 330°C or higher for 5 consecutive seconds, or below -16°C for 5
consecutive seconds after 5 minutes have elapsed since the compressor is started.
<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.
If the detected total current is below 0.7A for 20 consecutive seconds when the air
conditioner operates beyond its rated capacity, the air conditioner stops and this error
code is displayed. (This function does not work for 3 minutes after the outdoor unit starts
operating.)
<Points of diagnosis>
1. Check of refrigerating cycle: Gas leak (Refrigerant level is very low.)
2. Check of control board; Check for disconnection of CT (open) only. (The control
board is to be replaced in case of CT open.)
 For scroll compressor (DC motor): H16 is usually detected only when the
compressor is in operation.
If a rotation error (too high/low speed) is detected for 10 consecutive seconds, only the
fan motor is stopped and then restarted. If the rotation error is detected seven
consecutive times within 25 seconds, the fan motor lock is determined and this error
code is displayed.
<Points of diagnosis>
1. Check for indoor unit fan motor lock.
2. Poor contact and detached fan motor connector, fan motor failure and indoor unit
control board.
This error code is displayed when the detected temperature of the indoor unit heat
exchanger temperature sensor is below -50°C or 149°C or higher for 5 consecutive
seconds. (The temperature is not detected during De-Icing.)
<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 (≤2.5kΩ), poor contact of the
connector or a failure of control board has occurred.
This error code is displayed when the detected temperature of the outdoor temperature
sensor is below -40°C or 150°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.
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.
Descriptions on Diagnosis
—
—
64
Main Areas to be
Diagnosed
—
—
 Check of the model
of indoor & outdoor
units
 Indoor/outdoor unit
connection wire
 Indoor & outdoor
unit control boards
 Outdoor unit AC
circuit components
 Intake air
temperature sensor
(Bad connection/
detached
connector)
 Compressor
temperature sensor
(Bad connection /
detached
connector)
 Low refrigerant
level (almost
empty)
 Outdoor unit control
board
 Indoor unit control
board
 Indoor unit fan
motor
(Bad connection /
detached
connector)
 Indoor unit heat
exchanger
temperature sensor
(Bad connection /
detached
connector)
 Outdoor
temperature sensor
(Bad connection /
detached
connector)
 Outdoor unit heat
exchanger
temperature
sensor 1
(Bad connection /
detached
connector)