E1 system high pressure
protection
Is the reading on the
external pressure gauge
higher than 4.2 MPa?
Check the high-pressure
sensor?
Check if the shutoff valve
of the outdoor unit is
fully opened?
Is the outdoor unit well
covered by the panel?
Is the air intake and
return inlet too close to
each other or blocked?
Check if fans of the indoor
and outdoor units
work properly?
Check if the swing of the
indoor unit is fully opened?
Check the electronic
expansion valves of indoor and
outdoor units?
Check if fins of the indoor
and outdoor units are dirty
and blocked?
Clean fins
Check the electronic expansion
valve and main board
Check the swing motor and
input signal
Replace the main board
Remove the obstacle and increase
the distance between the air
intake and return inlet
Re-install the panel of the
outdoor unit
Fully open the shutoff valve
of the outdoor unit
Check the high-pressure
switch
Replace the main board of
the outdoor unit
Replace the pressure sensor
Yes
No
No
No
No
No
No
No
No
YesNoYes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Replace the pressure sensor
Replace the main board of
the outdoor unit
Is the outdoor environmental
temperature higher than 50
Celsius degrees?
No
Normal protection,
unnecessary to treat it
Yes
Yes
Check input signals of fans?
Replace the motor
No
Yes
Is the pipeline blocked?
Re-solder the pipeline
Yes
No
Too many
refrigerants are
charged
Check if the system enters the protection mode after
1.5 hours of continuous operation upon release of
1kg of refrigerants. Repeat the operation until the
protection mode is no longer enabled.
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