Signal Transmission Error On Outdoor Unit Pcb - Daikin H Series Service Manual

Troubleshooting

4.25 Signal Transmission Error on Outdoor Unit PCB

U7
Remote
Controller
Display
Method of Communication error between microcomputer mounted on the main microcomputer and PM1.
Malfunction
Detection
 The abnormality is determined when the data sent from the PM1 can not be received for 9
Malfunction
Decision
 The error counter is reset when the data from the PM1 can be successfully received.
Conditions
 Defective outdoor unit PCB
Supposed
Causes
Troubleshooting
Service Diagnosis
seconds.
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Turn off the power and turn it on
again.
Error again?
NO
YES
SiUS04-924_A
Replace the outdoor unit
PCB.
The cause can be an
external factor other than
the malfunction.
Observe the operating
condition in long term.
(R7185)
109