Service Manual -
B-VMHxxAV-1
Troubleshooting 49
7.26 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:
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.
The unit is operating normally.
NO
7.27 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:
YES
Power off, then restart the unit after 2 minutes.
Does the error still exist?
Replace the wired controller
Does a problem remain?
The unit is operating normally
NO
Check the wirings and connections
YES
Are all the
connections good?
Ensure proper connections
NO
YES
Replace the indoor main PCB
The problem is solved
NO
Summary of Contents for Comfort-Aire Century A-VMH18SV-1
Page 30: ...Service Manual B VMHxxAV 1 ...
Page 37: ...Service Manual B VMHxxAV 1 Outdoor Unit 3 3 Panel Plate X430 Square grille ...
Page 38: ...Service Manual B VMHxxAV 1 Outdoor Unit 4 4 Panel Plate D30 Square grille ...
Page 39: ...Service Manual B VMHxxAV 1 Outdoor Unit 5 5 2 Service Place Minimim 4 Recommended 12 ...
Page 42: ...Service Manual B VMHxxAV 1 Outdoor Unit 8 8 A VMH18SV 1 A VMH24SV 1 ...
Page 45: ...Service Manual B VMHxxAV 1 ...
Page 103: ...Service Manual B VMHxxAV 1 Troubleshooting 15 ...