Pc 41(Outdoor Compressor Current Sampling Circuit Failure Diagnosis And Solution); Eh B3 (Communication Error Between Wired Controller And Indoor Unit Diagnosis And Solution) - Mars Comfort-Aire Century VCD-SA Series Service Manual

Service Manual - VCDxxSA

7.27 PC 41(Outdoor compressor current sampling circuit failure diagnosis and solution)

Description: Three-phase sampling offset voltage error, the static bias voltage is normally 2.5V
Recommended parts to prepare:
• Outdoor main PCB
Troubleshooting and repair:
7.28 EH b3 (Communication error between wired controller and indoor unit Diagnosis and
Solution
Description: If Indoor PCB does not receive feedback from wired controller, the error displays on the wired controller
Recommended parts to prepare:
• Connection wires
• Indoor PCB
• Wired controller
Troubleshooting and repair:
Power off, then restart the unit after 2 minutes.
Shut off the power supply and
turn it on 2 minutes later.
Is it still displaying
the error code?
YES
Replace the outdoor main PCB.
Does a problem remain?
YES
Check the wirings and connections
Are all the
connections good?
YES
Replace the indoor main PCB
Does the error still exist?
YES
Replace the wired controller
Troubleshooting 50

NO The unit is operating normally.
NO The unit is operating normally
NO Ensure proper connections
NO The problem is solved
