Module 
temperature 
increase 
protection 
□ ★ ★    *    1.Check if there are 
seizes in the 
compressor 
2.。 
3.If there are any 
damages of  power 
module 
4.Check if the heat 
dispersion glue is 
even 
5.The voltage is too 
high (over 242V)or 
too low (below 
187V) 
6. 
High 
work-intense 
protection 
★ ★ ★  *      1.Check if the filter net 
is blocked 
2.The indoor&outdoor 
temperature could be 
too high 
3.Check if the system is 
overloaded with air 
4.Check if the base 
plate  is damaged. 
5.The voltage is too 
high (over 242V)or 
too low (below 
187V) 
 
CT wire breakage 
protection 
★ ■ ★    *    1.Check if the base 
plate is damaged or 
not 
2.The system is lack of 
air 
3.The direction 
changing of the 
4-way valve is not 
proper 
*      1.Check if the base plate 
is damaged or not 
EEPROM 
anomaly 
★ □ ★ 
  *    1.Check if the base plate 
is damaged. 
 
Inner blower fan 
anomaly 
■ □ ★  *       
Explanation 
 
□bright★flashing■
turn-off 
* Represents there is this 
function 
 
 
 
Model:
HSU-12HS03/R2(DB)
HSU-09HS03/R2(DB)Domestic Air Conditioner