Carrier 38MARBQ12AA1 Service Manual page 51

DIAGNOSIS AND SOLUTION (CONT)
Top temperature protection for compressor or High temperature or High pressure protection of IPM
module (PC02) (Cont)
and main control board wired
Method: Disconnect the plug.
Measure the high pressure protector
resistance. If the protector is normal,
Does the problem still exist?
temperature higher than 122°F(50°C)?
Is the outdoor fan running properly?
Is the heat exchanger dirty?
Replace the outdoor main board.
Check whether the refrigerant
system is functioning properly.
SG-38MARB-01
High pressure protection
Are the high pressure switch
correctly?
Yes
Is the high pressure
protector broken?
the value is 0.
Yes
Is the outdoor ambient
No
Check if the outdoor unit
ventilation is good.
Yes
Yes
No
Is the problem resolved?
No
Specifications subject to change without notice.
Connect the high pressure switch
No
and main control board.
Replace the
No
high pressure protector.
Stop the unit.
Yes
Ensure that the outdoor unit's
No
ventiliation is functioning properly.
Refer to the "Fan Speed is operating
No
outside of Normal Range" malfunction.
Yes Clean the heat exchanger.
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