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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.
Display
High pressure protection
NO
YES
Correct specific point
or
Check visible parts for the system
1) Closed service valve; 2) Dirty heat exchanger; 3) Dirty air filter; 4) FAN is not operating
NO
Replace the main control board
1.Error definition:
P1: The detected high pressure is no less than 566psig.
E1: System locks up when P1 has occurred six times within 3 hours.
2.Possible causes:
Service valves are closed.
The system has been severely over-charged.
Indoor air filter is dirty
Dirty heat exchanger of outdoor unit in cooling mode.
The refrigerant blocked in high pressure zone because of damaged TXV in cooling
mode or damaged EEV in heating mode.
G signal is lost resulting in indoor unit FAN=OFF in heating mode.
Damaged high pressure sensor.
Damaged main control board.
YES
Note:
Connect a pressure gauge to liquid stop valve in cooling mode, gas stop valve in heating
mode. Compare the value difference between gauged pressure and the transduced one by sensor.
NO
Replace the high pressure
sensor
YES
YES
Cooling mode:
Check if the TXV of indoor unit is dirty plugging.
Heating mode:
Check if the EEV of outdoor unit is dirty plugging.
Use AUTO charge mode to check whether there is too much refrigerant in the system.
Replace the main control board if the protection happens again with proper refrigerant amount.
Satisfy any contents above.
Can the pressure transduce properly based on
High Pressure Sensor
Voltage Characteristics D*.
Is the high pressure close to
566psig before protection?
Whether the low pressure has
been evacuated?
NO