IV–91P13 Refrigerant Circuit Error (3WAY)c Error detection method• The indoor unit outputs this warning when it determines that a compressor, outdoor solenoid valves, systemrefrigerant should be inspected.• For detailed inspection procedure, see P13 Refrigerant Circuit Fault (W MULTI).• The system stops and there is no automatic reset when this warning is output.d Troubleshooting1Pressuresensorinspection1-1 For adjustment of the pressure sensor, see (adjustmentprocedure section F16).OK 2-1NG Repair2Inspectsystemrefrigerant 2-1Use the No. 4 test mode “v_open” (valve open) to equalize thepressure to assess whether amount of refrigerant is extremelylow when it is lower in pressure than saturated pressureat ambient temperature. (Assessed as out of gas whenextremely low)Out of refrigerant gas?Yes Check for refrigerantleaks and repair.No 3-13Inspect thecompressor.3-1 Turn off the outdoor unit (be sure to do this before work)3-2 Use the instructions in P26 Clutch Connection Fault, to adjustoperation and wiring of clutch 1 and 2. Any problems?Yes 4-1No 7-14Inspectrefrigerantoil.4-1 Replace the compressor and check the refrigerant oil in thereplaced compressor for contamination.Not contaminated 5-1Contaminated 6-15Replacecompressor(1)5-1 After replacing the compressor, perform a trial operation and check the equipment. Checkcompleted if OK.6Replacecompressor(2)6-1 Perform a flashing cleaning to clean the inside of the refrigerant tubes.7Inspectoutdoorsolenoidvalves 7-1Adjust outdoor solenoid valves. Use trial operation modeto check that the solenoid valves operate normally ineach operating mode (cooling/heating) and measuretube temperature around solenoid valves to assess. (Forinformation on solenoid valve operation in each operatingmode, see the sections Control functions - Operating controlin the “Outdoor unit manual.”Does the solenoid valve operate normally?Yes Replace outdoor mainboardNo 7-27-2Adjust the power board.Does the power board CN013 output the solenoid powersupply voltage (AC 200V)?Yes 7-37-3 Any poor connection and broken wires in wiring between thepower board and the relay board?Yes Repair wiringNo 7-47-4Adjust the outdoor main board.In No. 4 test mode when “v_open” (valve open), is there adrive output voltage (DC 12V) from discharge valves 1-1, 1-2,discharge valve 2, suction valve 2-1 and 2-2?(9P (white) CN018)Discharge valve 1-1, 1-2: between No. 3 - 9 Discharge valve 2:between No. 4-9Suction valve 2-1, 2-2: between No. 6 - 9Does suction valve 1 output a drive voltage (DC 12V) duringcooling operation?Suction valve 1: between No. 3 - 9* Note that suction valve 1 closes when powered (the othervalves operate in the opposite way)Yes 7-5No Replace outdoor mainboard
