Troubleshooting - Carrier 40MBAB Series Service Manual

40MBAB: Service Manual

TROUBLESHOOTING

Test the voltage between P and N on back of the outdoor unit main PCB with a multimeter. If the voltage is lower than 36V, the capacitors are fully
discharged.
Error Display (Indoor Unit)
When the indoor unit encounters a recognized error, an error code appears (see Table 6).
DISPLAY
Indoor unit EEPROM parameter error
EH00
Indoor / outdoor unit communication error
EL01
EL16 Communication malfunction between adapter board and outdoor main board
The indoor fan speed is operating outside of the normal range (for some models)
EH03
EH60 Indoor room temperature sensor T1 is in open circuit or has short circuited
Evaporator coil temperature sensor T2 is in open circuit or has short circuited
EH61
Evaporator coil temperature sensor T2B is in open circuit or has short circuited
EH62
Evaporator coil temperature sensor T2A is in open circuit or has short circuited
EH65
Refrigerant Leakage Detection (for some models)
ELOC
EH06 Communication error between indoor two chips
Water-level alarm malfunction
EH0E
EC07 The outdoor fan speed is operating outside of the normal range (for some models)
Outdoor unit EEPROM parameter error
EC51
Condenser coil temperature sensor T3 is in open circuit or has short circuited
EC52
EC53 Outdoor room temperature sensor T4 is in open circuit or has short circuited
Compressor discharge temperature sensor TP is in open circuit or has short circuited
EC54
EC56 Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited (for free match indoor units)
IPM malfunction or IGBT over-strong current protection
PC00
Over voltage or over low voltage protection
PC01
PC02 Top temperature protection of compressor or High temperature protection of IPM module
Low pressure protection (for some models)
PC03
PC04 Inverter compressor drive error
Outdoor unit malfunction
EC0d
Low ambient temperature protection
PC0L
FL09 Mismatch between the new and old platforms
For other errors: The display board may display a code or a code undefined by the service manual. Ensure the code is not a temperature reading.
Table 7 — Error Display on Two Way Communication Wired Controller
DISPLAY
Communication error between wire controller and indoor unit
EH63
The other error codes displayed on the wire controller are the same from those on the unit.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
WARNING
Turn off all power supplies or disconnect all wires to avoid electric
shock. While checking indoor/outdoor PCB, please equip oneself with
anti-static gloves or wrist strap to avoid damage to the board.
WARNING
Electricity remains in capacitors even when the power supply is off.
Ensure the capacitors are fully discharged before troubleshooting.
Table 6 — Error Display (Indoor Unit)
ERROR INFORMATION
MALFUNCTION OR PROTECTION
13
SOLUTION
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SOLUTION
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