.LED output: 
Twinkling times of 
LED 
Possible cause of the malfunction 
1  Outdoor temperature sensor abnormity 
2  Outdoor defrosting sensor abnormity 
3  Compressor discharge temperature abnormity 
4  High compressor discharge temperature 
5  Indoor-outdoor communication abnormity 
6  Abnormal communication to IPDU module 
7  E2PROM data abnormity 
8  IPDU abnormity: Maximum revolving rate exceeded 
9  IPDU abnormity: Vibration 
10  IPDU abnormity: Displaced 
11  IPDU abnormity: Speeding up abnormity 
12  IPDU abnormity: G-TR short circuit 
13  IPDU abnormity: Position-testing loop abnormity 
14  IPDU abnormity: Current sensor abnormity 
15  IPDU abnormity: Compressor locked 
16  IPDU abnormity: Compressor damaged 
17  IPDU abnormity: Case thermo action 
 
 
Model:
HSU-12HS03/R2(DB)
HSU-09HS03/R2(DB)Domestic Air Conditioner