CS-Z20TKEW, CS-Z25TKEW, CS-Z35TKEW, CS-Z42TKEW, CS-Z50TKEW, CS-Z71TKEW, CS-XZ20TKEW, CS-XZ25TKEW, CS-XZ35TKEW, CS-XZ50TKEW, CU-Z20TKE, CU-Z25TKE, CU-, 35TKE, CU-Z42TKE, CU-Z50TKE, CU-Z71TKE, CU-Z20TKE, CU-Z25TKE, CU-Z35TKE, CU-Z50TKE - Panasonic Air Conditioner Service Manual (repair manual). Page 127

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127 
18.4.12  H33 (Unspecified Voltage between Indoor and Outdoor) 
Malfunction Decision Conditions 
  The supply power is detected for its requirement by the indoor/outdoor transmission. 
 
Malfunction Caused 
  Wrong models interconnected. 
  Wrong indoor unit and outdoor unit PCBs used. 
  Indoor unit or outdoor unit PCB defective. 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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