Service Manual -
B-VMHxxAV-1
Troubleshooting 31
7.8 PC 01(Over voltage or too low voltage protection)/PC 10(Outdoor unit low AC
voltage protection)/PC 11(Outdoor unit main control board DC bus high voltage
protection)/PC 12(Outdoor unit main control board DC bus high voltage protection
/341 MCE error) Diagnosis and Solution
Description:
Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit.
Recommended parts to prepare:
• Power supply wires
• IPM module board
• PCB
• Reactor
Troubleshooting and repair:
Check the power supply.
Is it in working order?
Turn off the unit.
NO
Check the connections and wires.
YES
Are they in working order?
Ensure proper connections or
replace the wires.
NO
Power on and measure the
voltage between P and N.
YES
While the unit is in standby,
is the voltage between P and N is around
DC 310V, 340V or 380V? When start up
the unit, is it in 220V~400V?
Replace the IPM board.
NO
Check the reactor.
YES
Is it in working order?
Replace outdoor PCB.
NO
Replace the reactor.
YES
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
Skip this step for models which
electric control box cover cannot
be removed.See the disassembly
guide for details.
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 ...