Carrier 40MBFAQ Service Manual page 29

40MBFAQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
PC 02 (Top temperature protection of compressor or High temperature protection of IPM module Diagnosis and
Solution)
Description: For some models with overload protection, if the sampling voltage is not 5V, the LED displays a failure.
If the temperature of IPM module is higher than a certain value, the LED displays a failure code.
Recommended parts to prepare:
• Connection wires
• Outdoor PCB
• IPM module board
• High pressure protector
• System blocks
Troubleshooting
Check if the air flow system
of the indoor and outdoor units
are obstructed.
No
Turn off the power supply and turn
it back on 30 minutes later.
Yes
Check if the temperature of
compressor Top is more
than 194°F(90°C).
Yes
Check if the refrigerant
system is normal.
Yes
Replace the outdoor control PCB.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Clear up the air inlet and outlet or the heat
Yes
exchanger of indoor and outdoor units.
Check if all the connections, especially
the connection of OLP (Over Load
No
Protector) sensor is good.
Measure the resistance
between the two ports of
No
Repair the refrigerant
system.
Check the fastening screws on the
PCB and IPM radiator.
Are they
securely tightened?
NO
Tighten the screws and apply
silicon grease.
Yes
the OLP. Is it zero?
Yes
Replace the outdoor
YES
control PCB.
29
Correct the connection.
No
No
Replace the OLP.
Replace the outdoor control PCB.