Table of Contents
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F1 (High pressure protection switch error)
Diagnosis
Whether gas valve and liquid
valve are open
Yes
Whether high pressure switch
resistance is normal
Yes
Stop the unit for an hour to see
whether it reports the same
error
HH/PH (Compressor liquid return)
Diagnosis
Whether T3，T5 are abnormal
(refer to sensor error testing)
No
Whether indoor unit is
abnormal, valve is blocked or
radiator is sheltered, fan is
stopped
No
If there's TXV or EV adjusting
for indoor unit(Not applicable
for valve element)
Yes
In heating mode, reporting
error
To see whether external fan is
normal
Yes
Restart and heating, after
45min, check whether the
external EV action is normal
(If air discharge superheat)
36
Handling
No
Open gas valve and
liquid valve
No
Replace sensors
Yes
Replace the mainboard
No
Keep operating
Handling
Yes
Replace sensors
Yes
Troubleshoot indoor unit
No
Not applicable for valve
element
Troubleshoot external
No
fan (replace the fan
motor or fan blade)
No
Replace the mainboard
Yes
Replace outdoor EV
H8 (Pressure sensor error)
Diagnosis
Whether pressure sensor PS
wiring is normal
Yes
If voltage between gauging
pressure sensor PS white line
and black line is between
0.5-4.5V
Yes
Restart to see if there's the
same error
C3 (T3 sensor loosely-inserted protection)
Diagnosis
Whether the sensor is fixed to
the heat exchanger
No
Check if T3, T4 sensors and
pressure switch are wired
according to wiring nameplate
Yes
Check if there're other heat
sources around T3，T4
No
Whether pressure switch HPC
is in error, whether the fan
doesn't operate
No
Power off and restart to see
if there's the same error
Handling
Wiring according to the
No
nameplate correctly and
power on to restart
No
Replace pressure sensor
No
Keep on operating
Yes
Replace the mainboard
Handling
Fix the sensor to the
Yes
heat exchanger to U
pipe, and power on to
restart
Wiring according to the
No
nameplate correctly and
power on to restart
Yes
Exclude influence by the
nearby heat sources
Yes
Replace the fan and
pressure switch
Yes
Replace the mainboard
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