Service Manual -
B-VMHxxAV-1
Troubleshooting 39
7.15 PC 0F
(
PFC module protection diagnosis and solution)
Description
: When the voltage signal that IPM send to compressor drive chip is abnormal, the LED displays the failure
code and the AC turns off.
Recommended parts to prepare:
• Connection wires
• Inductance
• Outdoor main PCB
• PFC module
Troubleshooting and repair:
At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or close to 0, the
IPM is defective. Otherwise, please follow the procedure below:
Check whether the
connecting line between
main board and the PFC
module is connected tightly
Check whether the
connecting line between
main board and the PFC
module is connected tightly
Yes
Measure whether the voltage
between P and N is normal
refer to the Index
?
Measure whether the voltage
between P and N is normal
refer to the Index
?
No
Check whether the
inductance of PFC module is
good? If the inductance is
good, the resistance of the
two ports is 0
Check whether the
inductance of PFC module is
good? If the inductance is
good, the resistance of the
two ports is 0
Yes
Replace the inductance
Replace the inductance
No
Connect it tightly, check
normal or not
Connect it tightly, check
normal or not
Replace the outdoor main board
Replace the outdoor main board
Yes
Yes
No
No
Replace the PFC module
Replace the PFC module
Trouble is solved
Trouble is solved
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 ...