COMFORT-AIRE B-SVH24SA-1 Service Manual page 34

9.3.2 Indoor / outdoor unit's communication diagnosis and solution (E1)
Error Code
Malfunction conditions
Possible causes
Troubleshooting:
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 error
●
Indoor or outdoor PCB faulty
●
Power off, then restart the unit 2 minutes later.
Is the error extinguished?
No
Measure Vs.
Is the voltage moving alternately
between -25V to 25V?
Yes
Check the outdoor wiring connection.
Is the wiring correct?
Yes
Does reactor
No
check normal?
Yes
Replace the outdoor main PCB.
Power on.
Is the error extinguished?
No
Replace the indoor PCB.
Service Manual - SVH 09/12/18/24 Series
Check the indoor wiring connection.
Replace the indoor main PCB.
Replace the outdoor main PCB.
34
No
Is the wiring correct?
Yes
Power on.
Is the error extinguished?
No