Carrier 40GXC Service Manual

Also see for 38GXC: Installation instructions Owner's manual Owner's manual Product data

Contents

19DIAGNOSTIC CHARTS (CONT.)Is unit running in outdoorambient higher than110 °F?Beyond operating rangeOutdoor coil clean? Clean coil.Problem persists? Problem solvedCheck outdoor coiltemperature thermistor .Chart 4, ok?Check motor for openor short. Ok?Check output on outdoorboard. Ok?Replace outdoor boardReplace thermistor .Problem persists Problem solvedReplace outdoor motorYesNoNoYesNo NoNoYesNoYesYesYesNoIs unit running in outdoorambient higher than110 °F?Beyond operating rangeOutdoor coil clean? Clean coil.Problem persists? Problem solvedCheck outdoor coiltemperature thermistor .Chart 4, ok?Check motor for openor short. Ok?Check output on outdoorboard. Ok?Replace outdoor boardReplace thermistor .Problem persists Problem solvedReplace outdoor motorYesNoNoYesNo NoNoYesNoYesYesYesNoA09364Fig. 32 – High Condensing TemperatureIs unit running in outdoorambient higher than110 °F?Beyond operating rangeOutdoor coil clean? Clean coil.Problem persists? Problem solvedCheck connections fromOD board. Loose, corroded,or high resistance?Check output onoutdoor board. Ok?Connect low side gauge atsuction service valve.Measure discharge temp.*Check amp draw tocompressor? Values withinrange?Replace outdoor boardReplace compressorClean/repair connectionProblem persists? Problem solvedReplace outdoor boardHigh head, high suction? High head, low suction?Unit is overcharged.Reclaim charge and weighin correct charge.YesYesYesYesYesYesNoNoNoNo NoNoNoYesYesNoNoYesYesRestriction in refrigerationcircuit.YesOutdoor motor ok?NoReplace motor*Measure discharge temperature at the sensor on the dischargetube. See Appendix A5Is unit running in outdoorambient higher than110 °F?Beyond operating rangeOutdoor coil clean? Clean coil.Problem persists? Problem solvedCheck connections fromOD board. Loose, corroded,or high resistance?Check output onoutdoor board. Ok?Connect low side gauge atsuction service valve.Measure discharge temp.*Check amp draw tocompressor? Values withinrange?Replace outdoor boardReplace compressorClean/repair connectionProblem persists? Problem solvedReplace outdoor boardHigh head, high suction? High head, low suction?Unit is overcharged.Reclaim charge and weighin correct charge.YesYesYesYesYesYesNoNoNoNo NoNoNoYesYesNoNoYesYesRestriction in refrigerationcircuit.YesOutdoor motor ok?NoReplace motor*Measure discharge temperature at the sensor on the dischargetube. See Appendix A5A09365Fig. 33 – Compressor Overcurrent Protection38/40GXC(Q)