Defective Pcb - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

Troubleshooting by Error Code

4.50 Defective PCB

M1
Error Code
Applicable
Centralized controller
Models intelligent touch controller
Schedule timer
Method of Error DIII-NET polarity circuit defective conditions are used to detect the error.
Detection
Error Decision
The test detects both positive polarity and negative polarity.
Conditions
Supposed
Causes
Troubleshooting
209
Defective centralized controller PCB
Defective intelligent touch controller PCB
Defect of Schedule timer PCB
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Reconnect the power of
centralized controller
displaying M1.
Is M1 displayed again?
YES
NO
Replace the
centralized controller.
Centralized controller is
normal.
Possibly caused by
external factors (such as
interference) related to
other equipment.
Service Diagnosis
SiUS331604E