Panasonic CS-VZ9SKE Service Manual page 104

F83 Prevention of over-
increase of Aluminium
Electric Heater
(Heatcharge)
temperature
F86 Aluminium Electric
Heater (Heatcharge)
3-way valve cycle
abnormality
F90 PFC protection
F91 Refrigeration cycle
error
F93 Compressor rotation
error
F95 Overpressure
protection in case of
cooling error
When the Aluminium Electric Heater (Heatcharge) is switched ON, if the sensor detects
more than 85 °C of heat, the power supply to the Aluminium Electric Heater
(Heatcharge) is switched OFF. Furthermore, when more than 100 °C is detected, the
error code is shown.
[Heating operation] No blinking of timer LED
When any of the following conditions is met, the error code is stored in the system. No
indication of error code is given.
 While the compressor operates at a fixed speed,
Outdoor heat exchanger sensor 1 – Aluminium Electric Heater (Heatcharge) 3-way
valve sensor >= 18°C
 Close to the completion of non stop deice,
Outdoor heat exchanger sensor 2 < Aluminium Electric Heater (Heatcharge) 3-way
valve sensor temperature
[Operation other than heating mode]
An error code is shown when all of the following conditions are fulfilled for 10 seconds
within 70 to 250 seconds in cooling mode.
 Compressor temperature – Outdoor heat exchanger sensor 2 temperature >= 20°C
 Outdoor heat exchanger sensor 2 temperature – Outside temperature < 5°C
 Present compressor temperature – compressor temperature at the operation start
>= 25°C or compressor temperature >= 100°C
The compressor stops if the DC voltage of the outdoor unit control board (PFC output)
exceeds the preset value for protection against over-voltage. The error code is
displayed if the protection is activated four times within 20 minutes.
<Points of diagnosis>
1. Check of the inverter circuit on the control board:
The voltage of IPM is checked within 3 minutes after the power is OFF and then ON.
Symptom: The compressor stops after 30 seconds from its start and F90 is stored in
the memory. The error code is displayed once the compressor is restarted four
times.
While the air conditioner is in operation beyond the ratings, this diagnosis code is stored
in the memory and the compressor stops if:
 During cooling or dry cool operation:
Indoor unit intake air temperature - Indoor unit pipe temperature < 4°C
 During heating operation:
Indoor unit pipe temperature - Indoor unit intake air temperature < 5°C
In the case where the air conditioner operates within the total current range of 0.7 –
1.4A for 5 minutes.
The compressor resumes operation after 180 seconds. The error code is displayed if
this error is detected two times within 20 minutes.
<Points of diagnosis>
1. Check of refrigerating cycle: Gas leak. (Gas level is less than a half.) The diagnosis
code to be displayed due to gas leak changes in the order of H99 → F97 → F91 →
H16 depending on the amount of gas leaked. The range of this error (F91) is
extremely small. (Protection of the compressor at the beginning of a season)
If the rotation of the compressor does not synchronize with the control signal, this
diagnosis code is stored in the memory and the compressor stops. It resumes operation
after 180 seconds. The error code is displayed if this error is detected four times within
20 minutes.
<Points of diagnosis>
1. Symptom caused by the failure to open the 2-way and 3-way valves: The
compressor stops after it operates for 1 to 3 minutes from its start and F93 is stored
in the memory.
2. Check of the inverter circuit of the control circuit: The IPM base current is checked (6
locations) within 3 minutes after the power is turned off and on. Symptom: The
compressor stops after 30 seconds from its start and F93 is stored in the memory.
The error code is displayed once the compressor is restarted four times.
3. Check of the disconnection of the compressor coil (open): Approximately 1Ω when
each phase is in normal state (The symptom is the same as the above 2.).
When the temperature of the outdoor unit heat exchanger temperature sensor 1
exceeds 61°C during the cooling or dry cool operation, this diagnosis code is stored in
the memory and the compressor stops operation. No error code is displayed.
<Points of diagnosis>
1. Check of the outdoor unit heat exchanger temperature sensor 1. (Check for change
in characteristic and resistance value.)
2. Check for interrupted heat radiation on the outdoor unit.
104
 Over-increase of
Aluminium
Electric Heater
(Heatcharge)
temperature
 Aluminium
Electric Heater
(Heatcharge)
sensor
 Blockage of
Aluminium
Electric Heater
(Heatcharge) heat
radiation
 Aluminium
Electric Heater
(Heatcharge)
3-way valve
clogged
 Wire cut of
Aluminium
Electric Heater
(Heatcharge)
3-way valve coil
 Outdoor unit PCB
 Refrigerant leakage
 Abnormal
resistance of
Aluminium
Electric Heater
(Heatcharge)
3-way valve sensor
 Outdoor unit control
board
 Draining of
refrigerant
(3-way valve
opening failure,
gas leak, etc.)
 Outdoor unit control
board
 3-way valve
opening failure
 Detached
compressor
connector
 Compressor phase
interruption
 Outdoor unit heat
exchanger
temperature
sensor 1
 Interrupted heat
radiation