Carrier X-POWER Series Service Manual page 151

Carrier service manual
4.4 E5: Voltage error (Display on faulty unit, others in standby)
E5: Voltage error
Voltage of power supply is too high or
too low (the normal voltage between
L1 and L2 (L1 and L3, L2 and L3)
should be 165V~255V)
No
Check the high voltage circuit.
Whether the compressor is short
①
circuit , fan motor is short circuit
inverter module is output error
No
Outdoor main control board is
damaged
Note:
1. How to check whether the compressor is short circuit
The normal resistance value of inverter compressor among U V W is E655 0.164Ω/ E405 0.23Ω, and infinity to earth. If the
resistance value is out of the range, the compressor is abnormal.
2. How to check whether the fan motor is short circuit
The normal value of DC fan motor coil among U V W is less than 10Ω, and the value of AC fan motor coil is from a few ohm to
hundreds of ohm for different fan motor model. If the measured value is 0Ω, the fan motor is short circuit.
3. How to check whether the inverter module is output error
Dial the multimeter to diode position, black pen on P and red pen respectively on U,V,W, if the multimeter displays 0.3~0.7 V, it
is normal; Red pen on N, black pen respectively on U,V,W, if the multimeter displays 0.3~0.7 V, it is normal.
Satisfying the above two conditions at the same time indicates that the inverter module has no problem.
Troubleshooting
Yes
Yes
②
,
③
, etc.
①
:
②
:
③
:
R410A DC Inverter Series
Provide normal power supply
Replace the inverter module
or repair related parts
Replace the outdoor main control board
169