Pc0A High Temperature Protection Of Condenser - Carrier 38MBRC Series Service Manual

38MBRC: Service Manual
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
higher than 65°C ?
Yes
Is the outdoor ambient
Is the outdoor ambient
temperature higher than
temperature higher than
50 /54 (tropical models)?
50 /54 / / (
No
Is the outdoor unit
Is the outdoor unit
ventilation functioning
ventilation functioning
properly?
?
Yes
Is the outdoor fan running
Is the outdoor fan running
properly?
properly?
Yes
Is the heat exchanger dirty ?
Is the heat exchanger dirty ?
No
Replace outdoor main
Replace outdoor main
board. Has the problem been
board. Has the problem been
resolved?
resolved?
No
If the level of refrigerant is not
If the level of refrigerant is not
sufficient, does the system work
sufficient, does the system work
after refrigerant is added ?
after refrigerant is added ?
No
Check whether the refrigerant
Check whether the refrigerant
system is functioning normally
system is functioning normally
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
No
Yes Stop the unit
Stop the unit
)?
Ensure the outdoor unit ventilation
Ensure that the outdoor unit ventilate
No
is functioning properly
is functioning properly
Please refer to the solution of the
Please refer to the solution of the
No " fan speed is operating outside of
" fan speed is operating outside of
the normal range " malfunction.
the normal range " malfunction.
Clean the heat exchanger
Yes
Clean the heat exchanger
Is the connection between
temperature sensor and
PCB in working order?
Yes
Is the resistance of
Is the resistance of
condenser temp. sensor
condenser temp. sensor
normal ?
Normal?
Yes
29
No Correct the connection
Correct the connection
No Replace the temperature sensor