Daikin R407C PLUS - Indoor Unit: PC Board Defect

Troubleshooting Si33-105
158 Troubleshooting R407C PLUS Series Heat Recovery System
3.2 Indoor Unit: PC Board Defect
Remote
Controller
Display
A1
Supposed
Causes
!
Defect of indoor unit PC board
Troubleshooting
Turn power supply OFF, then
power ON again.
Does the system
return to normal?
YES
External factor other than
malfunction (for example, noise
etc.).
Replace the indoor unit PC board.
(V0816)
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.