Carrier 38GJQ Series Installation Instructions Manual

Also see for 38GJQ Series: Owner's manual

45TROUBLESHOOTINGThis unit has on−board diagnostics. Error codes are displayed on the wired remote controller and the outdoor unit microprocessor board withcolored LED lights. Table 42 explains the error codes on both.Sizes 18 and 24Table 42—Malfunction Status TableMALFUNCTION NAME MALFUNCTION TYPE NIXIETUBEZero cross detection circuit malfunction (for indoor unit) Hardware malfunction U8Malfunction protection of jumper cap (for indoor unit) Hardware malfunction C5Feedback of without IDU motor(for indoor unit) Hardware malfunction H6Indoor ambient temperature sensor is open/short circuited Hardware malfunction F1Indoor evaporator temperature sensor is open/short circuited Hardware malfunction F2Liquid valve temperature sensor is open/short circuited Hardware malfunction b5Gas valve temperature sensor is open/short circuited Hardware malfunction b7Modular temperature sensor is open/short circuited Hardware malfunction P7Outdoor ambient temperature sensor is open/short circuited Hardware malfunction F3Outdoor condenser middle pipe temperature sensor isopen/short circuited Hardware malfunction F4Outdoor discharge temperature sensor is open/short circuited Hardware malfunction F5Communication malfunction Hardware malfunction E6Malfunction of phase current detection circuit for compressor Hardware malfunction U1Module high temperature protection Viewing malfunction code through remote controller within 200s;displayed directly on nixie tube after 200sP8Refrigerant lacking or blockage protection of system (notavailable for residential ODU) F0Charging malfunction of capacitor Hardware malfunction PUHigh pressure protection of system Hardware malfunction E 1Low pressure protection of system (reserved) Hardware malfunction E3Compressor overload protection Viewing malfunction code through remote controller within 200s;displayed directly on nixie tube after 200s H3Indoor unit and outdoor unit do not match Hardware malfunction LPMalfunction of memory chip Hardware malfunction E EWrong connection of communication wire or malfunction ofelectronic expansion valve Hardware malfunction dnMalfunction protection of outdoor fan 1 Hardware malfunction L3Detection status of wrong connection of communication wire ormalfunction of electronic expansion valve Operation status ddMode conflict Operation status E7Refrigerant recycling mode Operation status FoX-fan Operation status ALDefrosting or oil return in heating mode Operation status H 1Start failure of compressorViewing malfunction code through remote controller within 200s;displayed directly on nixie tube after 200sLcHigh discharge temperature protection of compressor E4Overload protection E8Whole unit over-current protection E5Compressor phase current protection P5Compressor de-synchronizing H7Compressor phase-lacking/phase-inverse protection LdIPM modular protection H5DC bus-bar low voltage protection PLDC bus-bar high voltage protection PHPFC protection HCThe four-way valve is abnormal U7

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