Service Manual -
B-VMHxxAV-1
Troubleshooting 45
7.21 PC 0A (High temperature protection of condenser diagnosis and solution)
Description
: When the outdoor pipe temperature is more than 65°C, the unit stops. It starts again only when the
outdoor pipe temperature is less than 52°C.
Recommended parts to prepare:
• Connection wires
• Condenser temperature sensor
• Outdoor fan
• Outdoor main PCB
• Refrigerant
Troubleshooting and repair:
Is the condenser temperature
is Higher than 65°C?
Is the condenser temperature
is Higher than 65°C?
Yes
Is the resistance of
condenser temp. sensor
Normal?
Is the resistance of
condenser temp. sensor
Normal?
Replace the temperature sensor
Replace the temperature sensor
No
No
Is the outdoor ambient
temperature higher than
50
℃
/54
℃
(tropical models)?
Is the outdoor ambient
temperature higher than
50
℃
/54
℃
(tropical models)?
No
Stop the unit
Stop the unit
Yes
Is the outdoor unit
ventilation functioning
properly?
Is the outdoor unit
ventilation functioning
properly?
Yes
Ensure that the outdoor unit ventilate
is functioning properly
Ensure that the outdoor unit ventilate
is functioning properly
Is the heat exchanger dirty?
Is the heat exchanger dirty?
No
Clean the heat exchanger
Clean the heat exchanger
Yes
Check whether the refrigerant
system is functioning normally
Check whether the refrigerant
system is functioning normally
Replace outdoor main
board. Has the problem been
resolved?
Replace outdoor main
board. Has the problem been
resolved?
No
If the level of refrigerant is not
sufficient, does the system work
after refrigerant is added?
If the level of refrigerant is not
sufficient, does the system work
after refrigerant is added?
No
Is the outdoor fan running
properly?
Is the outdoor fan running
properly?
Please refer to the solution of the
"fan speed is operating outside of
the normal range" malfunction.
Please refer to the solution of the
"fan speed is operating outside of
the normal range" malfunction.
No
Yes
No
Correct the connection
Correct the connection
No
Yes
Is the connection between
temperature sensor and
PCB in working order?
Is the connection between
temperature sensor and
PCB in working order?
Yes
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 ...