Carrier 40MBFAQ Service Manual

40MBFAQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
29
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 ow system
of the indoor and outdoor units
are obstructed.
Clear up the air inlet and outlet or the heat
exchanger of indoor and outdoor units.
Yes
No
Yes
Yes
Turn o the power supply and turn
it back on 30 minutes later.
Check if the temperature of
compressor Top is more
than 194°F(90°C).
No
Check if the refrigerant
system is normal.
Repair the refrigerant
system.
Replace the outdoor control PCB.
Yes
Check if all the connections, especially
the connection of OLP (Over Load
Protector) sensor is good.
Correct the connection.
No
Measure the resistance
between the two ports of
the OLP. Is it zero?
Yes
Replace the OLP.
No
Replace the outdoor control PCB.
Yes
No
Check the fastening screws on the
PCB and IPM radiator.
Are they
securely tightened?
Replace the outdoor
control PCB.
Tighten the screws and apply
silicon grease.
NO
YES

Carrier 40MBFAQ Specifications

General

Brand	Carrier
Model	40MBFAQ
Category	Heater
Language	English