Since the indications cover various units, the corresponding parts listed below may not be present in some models. Sanyo Air Conditioner Error Codes Error Code Diagnostics items S01 Room temperature sensor failure S02 Indoor heat exchanger sensor failure S03 Humidity sensor failure S04 Compressor temperature sensor failure S05 Outdoor heat exchanger sensor failure S06 Outdoor air temperature sensor failure S07 Outdoor electrical current detection faillure E01 lndoor/outdoor communications failure E02 HIC circuit failure Power Tr (transistor) circuit failure E03 Outdoor unit external ROM (OTP data) failure E04 Peak current cut Off E05 PAM circuit failure Active circuit failure E06 Compressor discharge overheat prevention activated E07 Indoor fan operating failure E08 4-way valve switching failure Indoor zero-cross failure E09 No-reirigerant protection E10 DC compressor drive circuit failure E11 Outdoor fan operating failure E12 Outdoor system communications failure OLR operation Ou...