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ESI Outdoor Unit Installation Instruction
05.2018
Manufacturer reserves the right to change at any time for specifications or designs without notice and incurring obligations.
Discharge temperature sensor is
disconnected or damaged
1.Error definition:
When TD<TC-9F for 20 minutes, or the suction superheat(SH) is no less than 9F with
TD<TL-9F lasts 20 minutes.
TC: The saturation temperature of high pressure
2.Possible causes:
Discharge temperature (TD) sensor is disconnected or damaged.
Damaged main control board
Loose connection at port on main control board.
There are other heat sources around the sensor
Display
YES
NO
Check whether TD sensor is seated to the compressor discharge pipe
and securely connected to CN7 terminal on the main control board.
Reset and reconnect the
TD sensor
Check whether the
Resistance of Temperature sensor B*
is correct.
YES
NO
Replace the faulty sensor
Check whether there are other heat sources around sensor.
NO
YES
Remove all the other
heat source
Unplug TD sensor from CN7 and cycle the power. Can it operate under
backup running?
NO
Replace the main control
board
Replace the TD sensor
YES