Diagnosis And Solution; El01 Communication Malfunction Between The Indoor And Outdoor Units - Carrier 38MBRC Series Service Manual

38MBRC: Service Manual

DIAGNOSIS AND SOLUTION

EL 01 (Indoor and Outdoor Unit Communication Error Diagnosis and Solution)
Description: Indoor unit can not communicate with outdoor unit
Recommended parts to prepare:
• Signal wires
• Magnet ring
• Indoor PCB
• Outdoor PCB
Troubleshooting and repair:
XYE Communication:
Power off , then restart the unit 2
Check whether there's any
Such as too many lamps , power
transformers. Or the signal wire
Check whether the signal wire is
shield cable or whether the
Check whether the wire has the
correct polarity. P to P, Q to Q , E
Check whether the signal wire is broke.
Check whether the signal wires
are well placed on the PCB.
Replace the outdoor main PCB.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
,
minutes later.
Yes
interference.
.
?
is too long .
No
shield cable is earthing .
Yes
to E.
Yes
No
Yes
Replace the main PCB.
Is the error solved?
No
Remove interference or
Yes add magnet ring on power
Adopt shield cable /Shield cable
No
No Correct the connection.
Yes Replace the signal wire.
No Pull out and re-insert.
18
or
wire
/
earthing.
.