Gree GMV-VQ680WM/C-X Service Manual page 137

Gree
E1 System Overpressure
Yes
high pressure of the unit
(measured by the external
pressure gauge system) is
above 4.2 MPa?
high pr essure sensor is
Whether th e check
valve o f th e o utdo or unit
Whether th e o utd oor unit's
pan el i s fu lly closed?
Whether the air
inlet or return pipes for indoor
and outdoor units are short
circuited or blocked?
Whether th e i ndoor
units, outdoo r un its and fa ns
work pr operly?
air guid e lo uver o f th e in door
unit is fully op en?
indo or and outdoor
electronic exp ansion va lves
work pr operly?
Whether th e i ndoor and
outdoo r fins a re d irty or
Whether th e o utd oor
ambien t te mp erature
exceeds 50 deg rees?
Are the pipes clo gged?
refriger ant in the
Pro tection
Whether the
No
No
Whether th e
Yes
normal?
No
No
is fully open?
Yes
No
Yes
No
Yes
No
Yes
Whether th e
No
Yes
Whether th e
No
Yes
Yes
blocked?
No
Yes
No
Yes
No
Excessive
unit
GMV6 HR DC Inverter VRF Units Service Manual
Whether th e h igh pressu re
switch operates p roperly?
No
Replace th e main bo ard of
outdoo r un it
Ful ly o pe n th e che ck val ve
of the outdoor un it
Reinsta ll the outdoor un it's
pan el
Cl e an th e p ip e s to a vo id s ho r t
circuit
Whether th e fan inpu t
signal is n ormal?
Yes
Check the swing motor and
inpu t si gnal
Check the electro nic expan sio n
valve a nd the main boa rd
Clean the fins
System protectio n en abled and
no special car e re quired
Re-weld th e p ipes
Remove the refrigera nt for 1 kg e ach time, keep
the unit ru nning for 1.5 hou rs and then observe
whether th e system protection is e nabled.
Repea t the op erations a bove u nti l no system
protection is triggere d
135
Yes
Replace th e main bo ard of
outdoo r un it
Replace th e h igh pressu re
switch
Replace th e p ressur e
sensor
No
Replace th e main control
boa rd
Replace th e motor