E1 System Overpressure
Protection
Whet he r t he
hig h p re ssure of the un it
(measur ed by t he exte rnal
pressur e g au ge system ) is
ab ove 4.2 MPa?
Whether the
high pressure sensor is
normal?
Whether the check
valve o f the outdo or unit
is fully open?
Whether the o utdoor unit's
panel is fully closed?
Whether the air
inlet or return pipes for indoor
and outdoor units are short
circuited or blocked?
Whether the i ndoor
units, outdoo r un its and fans
work pr operly?
Whether the
air guide louver o f th e in door
unit is fully op en?
Whether the
indoor and outdoor
electronic exp ansion valves
work pr operly?
Whether the i ndoor and
outdoo r fins a re d irty or
blocked?
Clean the fins
Check the electro nic expan sion
valve a nd the main board
Check the swing motor and
input si gnal
Replace the main control
board
Clean the pipes to avoid short
circuit
Reinstall the outdoor unit's
panel
Fully open the check valve
of the outdoor un it
Whether the h igh pressure
switch operates properly?
Replace the main board of
outdoo r un it
Replace the h igh pressure
switch
Yes
No
No
No
No
No
No
No
No
YesNoYes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Replace the p ressur e
sensor
Replace the main board of
outdoo r un it
Whether the o utdoor
ambien t temp erature
exceeds 50 degrees?
No
System protection enabled and
no special care re quired
Yes
Yes
Whether the fan inpu t
signal is n ormal?
Replace the motor
No
Yes
Are the pipes clogged?
Re-weld the p ipes
Yes
No
Excessive
refriger ant in the
unit
Remove the refrigera nt for 1 kg each time, keep
the unit ru nning for 1.5 hou rs and then observe
whether the system protection is e nabled.
Repea t the operations above u ntil no system
protection is triggere d
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