40MBDAQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
37
DIAGNOSIS AND SOLUTION (CONT.)
J1 (Condenser high temperature protection)
Description: When the outdoor pipe temperature is higher than TP3+5°C, the unit stops. The unit starts again only when the
outdoor pipe temperature is lower than TP3-3°C.
Recommended parts to prepare:
• Condenser temperature sensor
• System leakage or block
Troubleshooting
High temperature protection of condenser
Is the condenser temperature
higher than 149°F (65°C)?
Check the outdoor ambient temperature.
YES
Is it higher than 50 °C ?
Stop the unit YES
Check the outdoor unit
ventilation.
NO
Is it functioning properly?
Ensure that the outdoor unit
ventilate is functioning properly.
NO
Check the outdoor fan.
YES
Is it running properly?
Refer to Fan Speed Out of Control
malfunction solution.
Identify the cause and resolve the problem.
NO
Check the heat exchanger.
YES
Is it dirty?
Clean the heat exchanger.YES
Replace outdoor main board.
NO
Has the problem
been resolved?
Check if the level of refrigerant is
sucient. If not, add more refrigerant.
NO
Check whether the refrigerant
system is functioning normally.
YES
Check the connection between
T3 and the PCB.
NO
Is it in working order?
NO
Correct the
connection.
Check the resistance of T3
(refer to Appendix 1).
YES
Is it normal? NO
Replace the
temperature sensor.
YES
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