Panasonic CS-A24BB4P Service Manual page 126

The "CHECK" display on the remote control and the flashing of
LEDs on the printed circuit boards will not occur immediately.
They will appear 3-6 minutes after the main power is turned on.
1. The main power is turned on while the transmission wires
between the indoor unit(s) are not connected (open circuit at
section A) / Symptom: / Nothing abnormal appears on the remote
control display. If operation is started in this condition, the
combination of the 50BB outdoor unit and the 14BB4 indoor unit
(master unit) will result in abnormal operation. /
continues, an abnormality will occur on the refrigeration cycle
and operation will stop.
- Remote control... "CHECK" flashes
- Indoor unit (master)... The LEDs on the printed circuit board
flash and operation stops
- Indoor unit (slave)... LED1 on the printed circuit board
illuminates and the unit does not operate at all
- Outdoor unit... The LEDs on the printed circuit board flash
and operation stops
2. The main power is turned on while the power supply wires
between the indoor unit(s) are not connected (open circuit at
section B) / Symptom: / Same as above. If operation continues,
an abnormality will occur on the refrigeration cycle and operation
will stop. /
- Remote control... "CHECK" flashes
- Indoor unit (master)... The LEDs on the printed circuit board
flash
- Indoor unit (slave)... The LEDs on the printed circuit board do
126
/ If operation