Carrier X-POWER Series - Page 152

R410A DC Inverter Series Carrier service manual
170 Troubleshooting
4.5 E7: Discharge temperature sensor error (Display on faulty unit, all the ODU in standby)
4.6 E8: Outdoor unit address is wrong (Only display on faulty slave unit, all the ODU in standby)
E
7
:
Discharge
temperature sensor error
The sensor port on main control
board is loosen
Fasten the connecting
port
The sensor is short circuit or disabled
(Using a multi-meter to measure
resistance, if the resistance is too
small, the sensor is short circuit, if the
resistance in certain temperature is
not consistent with attached table 1,
the sensor is disabled)
Replace the sensor
Outdoor main control board is
damaged
No
No
Yes
Yes
Replace the outdoor
main control board
E
8
:
Outdoor unit address is wrong
The ODU's address is more than 3 or
be set repeatedly
The addresses should be set less
than 3 and differently
No
Yes
Outdoor main control
board is damaged
Replace the outdoor
main control board