York Pyrenees Series Service Manual page 36

8.2.2 Indoor / outdoor unit's communication diagnosis and solution(E1)
Error Code
Malfunction decision
conditions
Supposed causes
Troubleshooting:
Replace the reactor
Replace the reactor
E1
Indoor unit does not receive the feedback from outdoor unit during
110 seconds and this condition happens four times continuously.
Wiring mistake
●
Indoor or outdoor PCB faulty
●
Power off, then restart the unit 2 minutes later.
Power off, then restart the unit 2 minutes later.
Is the error extinguished?
Is the error extinguished?
No
Measure Vs. Is the voltage moving
Measure Vs. Is the voltage moving
alternately between -25V to 25V?
alternately between -25V to 25V?
Yes
Check the outdoor wiring connection。
Check the outdoor wiring connection。
Is the wiring correctly?
Is the wiring correctly?
Yes
Check whether reactor
Check whether reactor
No
is normal?
is normal?
Yes
Replace the outdoor main PCB.
Replace the outdoor main PCB.
Power on. Is the error
Power on. Is the error
extinguished?
extinguished?
No
Replace the indoor main PCB.
Replace the indoor main PCB.
Check the indoor wiring connection。
34
No
Check the indoor wiring connection。
Is the wiring correctly?
Is the wiring correctly?
Yes
Replace the indoor main PCB.
Replace the indoor main PCB.
Power on. Is the error
Power on. Is the error
extinguished?
extinguished?
No
Replace the outdoor main PCB.
Replace the outdoor main PCB.