innovair ICS0736C21 Service Manual page 78

2.4 Solving steps for typical malfunction
2.4.1 For the indoor unit
2.4.1.1 Open or short circuit of temperature sensor
Check the connections
Check the connections
between temperature
between temperature
sensor and PCB. Are the
sensor and PCB. Are the
connections good?
connections good?
Yes
Measure the resistance value
Measure the resistance value
of the sensor via Appendix 1
of the sensor via Appendix 1
Is it normal?
Is it normal?
Yes
Replace the indoor PCB
Replace the indoor PCB
2.4.1.2. Outdoor unit malfunction
Whether the outdoor
Whether the outdoor
main board has error
main board has error
displayed
displayed
Yes
Refer to corresponding
Refer to corresponding
solving steps
solving steps
2.4.1.3. Indoor EEPROM malfunction
Power off, then restart the
unit 2 minutes later
Yes
Replace the indoor main PCB
EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and
reprogrammed using a pulsed voltage.
74
No Correct the connections.
Correct the connections.
No Replace the sensor.
Replace the sensor.
Power off, then restart the unit 2
Power off, then restart the unit 2
minutes later. If the outdoor main board
minutes later. If the outdoor main board
No
displays error code several minutes
displays error code several minutes
Yes
later?
later?
Electrical Control System