"Tech Tips" RAC/PAC - Panasonic

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Table of contents Page 3 Check list before you call Page 4 Inverter technology Page 5 26 thru 42k Btu units dual wiring diagram Page 6 9 thru 24k Btu units wiring diagram Page 7 Flexi Multi wiring diagram Page 8 Trouble shooting for 9-24k Btu units Page 9 Fault code retrieval procedure Page 10-14 Indoor/Outdoor board trouble shooting procedure Page 15 Trouble shooting for 26-42k Btu units Page 16 EPROM replacement procedure 2
Check the items below before calling Tech Support+ Description of Problem and date: 1) Verify there is a matching set. On PAC make sure it was not changed from a C to a CH. _____________________________________ 2) Mod# & Serial#______________________________________________ 3) New Install? ___ If not how long did it run? ______________________ 4) Wrong unit installed in a low ambient application? ________________ 5) Verify wiring is correct. Was shielded control wire used (PAC)? _____ 6) What are the code/codes? _____________________________________ 7) What is the voltage with load and no load? ______________________ 8) What is VDC between 2&3 (RAC)? ____________________________ 9) Are the service valves open? __________________________________ 10) When power is first applied, does the expansion valve Tick? _______ 11) Are the power lights on boards lit? ____________________________ 12) How long does the unit run before locking out? __________________ 13) What are the pressures & super heat while the unit is running? ________________ 14) Does the indoor unit beep when a command is sent by the remote? Is it in the correct mode? _________________________________________ 15) Is the powers relay energized (RAC) in condenser? _______________ 16) Is the transformer on the indoor unit good (PAC)? ______________ 17) Is there a condensation pump and is it wired correctly? Is the safety used and how is it wired? _______________________________________ 18) Have you put the unit into diagnostic mode (RAC)? If so what is the code? ________________________________________________________ 19) Is there a red power light on the outdoor board (RAC)? __________ 20) What lights are on and are they flashing? ______________________ *RAC is any 9-24,000 BTU model or any Flexi Multi model. *PAC is any 26-42,000 BTU model. How was the problem resolved? 3
Page 1: Technical Tips RAC/PAC 1
Page 5 and 6: DUAL - CIRCUIT WIRING (26 - 42,000
Page 7 and 8: Indoor Unit “A” Indoor Unit “
Page 9 and 10: (PROCEDURE FOR RETRIEVING FAULT COD
Page 11 and 12: (Cont. from previous page) 1. Turn
Page 13 and 14: E12: Outdoor Systems Communication
Page 15 and 16: Troubleshooting for the 26,000- 42,

"Tech Tips" RAC/PAC - Panasonic

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