26
E4 (Temp. sensor fault)
Diagnosis Handling
Check whether sensor T3/T4
/Tf/T5 are seated (T4 for Heat
Pump only)
Yes
Unplug the sensor, check
whether the resistance of T3,
T4 is in the range of TABLE1
Yes
Unplug the sensor, check
whether the resistance of TF,
T5 is in the range of TABLE2
Yes
No
Check whether display the same
error code when re-powered on
Keep running
Reseat the sensor
according to wiring
diagram
No
Replace T3 or T4 sensor
No
Replace Tf or T5 sensor
No
Replace the main control
board
Yes
H0 (Communication fault between main control chip and IPM chip)
Diagnosis Handling
Power off and then power on to
see whether it is normal
Yes
This fault is caused by strong
interference form electricity
grid.Unit will recovery when
electricity grid is normal.
Replace the main control
board
No
H4/P6 (IPM module protection)
Diagnosis Handling
Check whether the service
valves are open
Yes
Check whether the compressor
wiring is normal
Yes
Check whether compressor
insulation resistance is greater
than 100kΩ
Yes
Check whether compressor
windings are open
No
Restart to check that high and
low pressure difference is at
least 30PSIG after compressor
running 10 min.
Yes
Check whether compressor
discharge superheat is
below 9F after starting for 30
min in cooling mode, 50 min
in heating mode
Open the service
valves
No
Re-start after wiring
correctly according to the
wiring diagram
No
Replace compressor
Replace compressor
No
Replace compressor
No
Yes
Replace the main control
board and drive board
No
See HH/PH protection
Yes
Troubleshooting
Function description for the corresponding position (For 48/60k model)
N o . C on t ent N o . C on t ent
1 E X V d r i v ing po rt (HP onl y) 19 P oin t c he ck bu tt on
2 H igh p r e ss u r e s w i t c h po rt 20 T e m p . c on tr olle r c onne c t ion po rt
3 R adia t o r t e m p . s en s o r po rt 21 Fo r c ed ope r a t ion bu tt on
4 C onden s e r t e m p . s en s o r po rt 22 4 - w a y v al v e po rt (HP onl y)
5 O u t doo r t e m p . s en s o r po rt (HP onl y) 23 C onne c t t he c a t hode o f t he r e c t i f ie r b r idge
6 A i r di sc ha r ge t e m p . s en s o r po rt 24 DC m o t o r d r i v ing s ou r c e ( 15 V-P 2)
7 Pr e ss u r e transducer 25 T he v ol t age be t w een 25 and 26 is 380 V DC (C o m p r e ss o r is r unning )
8 C onne c t ion w i r e po rt be t w een m ain boa r ds 26 T he v ol t age be t w een 25 and 26 is 380 V (C o m p r e ss o r is r unning)
9 DC m o t o r d r i v ing s ou r c e ( 15 V-P 2) 27 C onne c t ion w i r e po rt be t w een m ain boa r ds
10 T he v ol t age be t w een 10 and 11 is 380 DC V (C o m p r e ss o r is r unnin
28 AC po w e r s uppl y inpu t po rt
11 T he v ol t age be t w een 10 and 11 is 380 V DC (C o m p r e ss o r is r unning ) 29 AC po w e r s uppl y inpu t po rt
12 T he v ol t age be t w een 12 and 13 is 380 V DC (C o m p r e ss o r is r unning ) 30 AC po w e r s uppl y ou t pu t po rt
13 T he v ol t age be t w een 12 and 13 is 380 V DC (C o m p r e ss o r is r unning ) 31 AC po w e r s uppl y ou t pu t po rt
14 DC m o t o r c on tr ol po rt 32 C o m p r e ss o r c onne c t ion t e r m inal
15 N i x ie t ube di s play 33 T he v ol t age be t w een 33 and 36 is 380 VDC (C o m p r e ss o r is r unning )
16 R e s e r v ed 34 R ea c t o r L1 w i r ing t e r m inal
17 D e fr o s t ing f un c t ion dial c ode S W5 35 R ea c t o r L2 w i r ing t e r m inal
18 Fun c t ion dial c ode S W4 36 T he v ol t age be t w een 33 and 36 is 380 VDC (C o m p r e ss o r is r unning)
DC
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