Daikin Altherma HT - C1 Indoor Unit: Failure of Transmission (between Indoor Unit PC Board and Control PC Board)

Troubleshooting by Indication on the Remote Controller ESIE09-08B
138 Troubleshooting
3.6 “C1” Indoor Unit: Failure of Transmission (Between
Indoor unit PC Board and Control PC Board)
Remote Control
Display
C1
Subcode 0
Applicable
Models
All indoor unit models
Method of
Malfunction
Detection
Check the condition of transmission between indoor PC board (A1P) and PC board for control
(A3P) using computer.
Malfunction
Decision
Conditions
When normal transmission is not conducted for certain duration.
Supposed
Causes
 Connection defect of the connecter between indoor PC board (A1P) and PC board for
control (A3P) (communication problem).
 Malfunction of indoor PC board (A1P).
 Malfunction of PC board for control (A3P).
 External factor, such as instantaneous blackout.