33
E4
(Temp. sensor error)
Diagnosis
Handling
Whether sensor T3
、
T4
、
TF
、
T5 are inserted and connected
reliably (No T4 for cooling only)
Yes
Unplug the sensor, check if
resistance for T3, T4 is in the
range of TABLE1
Yes
Unplug the sensor, check if
resistance for TF, T5 is in the
range of TABLE2
Yes
Whether report the same error
when re-powered on
Re-insert the sensor
tight according to
wiring nameplate
No
Replace T3 or T4 sensor
No
Replace TF or T5 sensor
No
Replace the mainboard
Yes
H0
(main control chip and communication chip communication error)
Diagnosis
Handling
Power off and re-power on to
see if it is normal
Yes
Caused by electricity grid
strong interference. Go back
to normal when electricity grid
is normal
Replace the mainboard
No
H4/P6
(
Compressor instant over-current protection)
Diagnosis
Handling
Check if ball valves are open
Yes
Check whether the compressor
wiring is normal
Yes
Whether compressor insulation
resistance is below 100k
Ω
Yes
Whether compressor coil
is broken
No
Restart to make sure that
high and low pressure
difference is within 0.2MPa
Yes
Air discharge superheat
point check after starting
for 30min is always below
5
℃
Open gas valve and
liquid valve
No
Re-start after wiring
correctly according to the
wiring nameplate
No
Compressor exchange
No
Start after pressure balance or if
system can’t balance pressure in
10min, then the refrigerant
system is error
No
Compressor exchange
Yes
Replace the mainboard
No
Cooling inside throttle
problem(TXV error) Heating
outside EXV problem exchange
Yes
Diagnosisfault diagnosis