[17] Current Detection Circuit Alarm; [18] Outdoor Heat Exchanger Sensor (Te) Short Circuit; [1C] Extension Ic, Eeprom Short Circuit Alarm - Toshiba HFCR407C Service Manual

Check code
[17]
Current detection circuit alarm
Is wiring connector on inverter
PC board normal?
Yes
Check inverter PC board.
Check code
[18]
Outdoor heat exchanger sensor (TE)
short circuit
TE1 sensor open/short has been detected. Confirm sensor is not disconnected (TE1 sensor: CN505), confirm
circuit and resistance value characteristics of sensor.
When the sensors are normal, replace outdoor PC board.
Check code
[1C]
Extension IC, EEPROM short circuit alarm
Is there an irregularity of outdoor
unit power source?
No
Check interface PC board.
Troubleshooting
Diagnostic procedure for check code
No
Yes
Operation cause
1. Defective wiring of inverter PC board
2. Defective inverter PC board
Operation cause
TE sensor open/short
Operation cause
1. Outdoor unit power source error
2. Interface PC board error.
Check power source voltage.
Check noise interference from outside, etc.
83
Modify connection of wiring
Modify power source line.
14