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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.
Module temperature protection
or
1.Error definition:
P5: The detected value of module temperature (TF) is no less than specific value.
2~3Ton:
181F
4~5Ton:
176F in cooling mode
167F in heating mode
E5: System locks up when P5 has occurred six times within 3 hours.
2.Possible causes:
Clogged fin of radiator resulting in poor heat transfer
Misjudgment caused by resistance drift of TF sensor
Dirty and blocked heat exchanger for the ODU
Damaged TF sensor
Damaged main control board.
Display
YES
NO
Does the heat discharge channel for outside exchanger and the fan
work properly?
Exclude heat discharge
factor
Is the heat exchanger in the back of main control board dirty or
corroded resulting in poor performance.
NO
YES
Remove the dirty or
blocked materials or
replace the PCB.
Check whether the resistance of sensor is in the range of
Temperature
sensor B*.
YES
NO
Replace the TF sensor
*Note
Replace the main control board
Note:
TF senor has been laid inside the assembly control box with silicon gel contacting the radiator . It’s
required to replace the main control board in this case.