Fisher FS2MIF-141AE2 Service Manual page 48

9.3.3.9 High temperature protection of condenser (ODU P5)
When outdoor pipe temperature is more than 65°C, the unit will stop, and unit runs again when outdoor pipe
temperature less than 52°C.
High temperature protection of
condenser
Check whether the
condenser temperature is
Higher than 65°C
Yes
Check whether the outdoor
ambient temperature is
higher than 50℃
No
Check if the outdoor unit
ventilation is good
Yes
Check if the outdoor fan runs
properly
Yes
Check whether the heat
exchanger is dirty
No
Replace outdoor main
board
No
Refrigerant is not enough add the
refrigerant
No
Check whether the refrigerant
system is ok
No
Yes Stop the unit
No Make the outdoor unit ventilate well
please refer to the solution of fan
speed has been out of control
No
malfunction . Find out the cause and
have it solved.
Yes Clean the heat exchanger
Check the connection
between temperature
sensor and PCB.
Yes
Check whether the
resistance of condenser
temp. sensor is normal
refer to the Appendix 1
Yes
No Correct the connection
No
Replace the temperature sensor