IOM SPLIT AHU KIT 8243 8245

9 I Installation and Operating Manual
Replace indoor main PCB
Is the error distinguished?
Correct the connection.
Yes
No
Check whether the wire is correct
polarity? P to P, Q to Q, E to E?
Replace the signal wire.
Yes
Check whether the signal
wire is broken?
Check whether the signal
wires insert on PCB well?
Replace the outdoor
Main PCB.
No
Pull out and insert back.
Yes
No
7.2 E2 temperature sensor malfunction
Check the connections between
temperature sensor and PCB.
Are the connections good?
Measure the resistance value
of the sensor.
Does the measured value corres-
pond to the temperature resistance
listet in appendix 1?
Replace the indoor PCB.
No
Yes
Yes
Correct the connections
Replace the sensor
No