High Pressure Protector - Carrier 40MBAB Series Service Manual

40MBAB: 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 the failure. If the
IPM module temperature is higher than a certain value, the LED displays the failure code.
Recommended parts to prepare:
• Connection wires

• High pressure protector

• IPM module board
• System blocks
• Outdoor PCB
Troubleshooting and Repair:
Check if the air flow system
of the indoor and outdoor units
is obstructed.
No
Turn off the power supply.
Wait 10 minutes and turn back on.
Yes
Check if the compressor top
temperature is higher
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 the air inlet and outlet or the indoor
Yes
Check if all the connection, especially the
No
connection of OLP (Over Load Protector)
No
refrigerant system.
Check the fastening screws on the
PCB and IPM radiator.
Are they secure?
NO
Tighten the screws and apply
silicon grease.
and outdoor unit's heat exchanger.
sensor is good.
Yes
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
Repair the
Replace the outdoor
YES
control PCB.
27
No Correct the connection.
No Replace the OLP.
Replace the outdoor control PCB.