37
H6/P4
(
Air discharge overtemperature protection)
Diagnosis
Handling
Whether gas valve and liquid
valve are open
Yes
Check whether air discharge
temp. sensor T5 resistance is
normal, refer to TABLE2
Yes
Whether position of air
discharge temp. sensor is
normal. If there’re other heat
sources around
No
Whether compressor is
normal
（
abnormal noise
，
abnormal vibration
）
No
Check refrigerant filling
conditions according to
refrigerant filling method
No
Whether in heating mode,
compressor air return
pressure is too low so that
there’s vacuum phenomenon
Open gas valve and
liquid valve
No
Replace air discharge
temp. sensor
No
Troubleshooting
problems and restart
Yes
Filling refrigerant and
restart
Yes
Replace compressor
Yes
Replace EXV (valve
sticking)
Replace the mainboard
Yes
No
F3/P5
(
T3 tube high temp.protection)
Diagnosis
Handling
Whether gas valve and liquid
valve are open
Yes
Whether T3
，
T5 are abnormal
No
Check whether outdoor unit fan
is abnormal and whether the
outdoor heat exchanger is
blocked by debris
No
Whether there's short circuit in
air outlet and inlet side when
the ambient temp. is high
No
Restart to see if there’s the
same error
Open gas valve and
liquid valve
No
Replace sensors
Yes
Replace the fan and
exclude the surrounding
debris of heat exchanger
Yes
Keep operating
No
No
Check refrigerant filling
amount according to
refrigerant filling method
Refill enough amount of
refrigerant
Yes
Replace installation position
or rectify the surrounding
goods to avoid air return short
circuit
Yes
Replace the mainboard
Yes
CE/P1
(
High pressure protection)
Diagnosis
Handling
Whether gas valve and liquid
valve are open
Yes
Whether high pressure switch
resistance is normal
Yes
Cooling mode refers to F3
Heating mode refers to Hb
Open gas valve and
liquid valve
No
Replace sensors
No
