Carrier 38GVM Series Service Manual

Also see for 38GVM Series: Installation instructions

Contents

Carrier 38GVM Series Service Manual Manual pdf 28 page image

28TROUBLESHOOTINGPrecautions for Performing Inspections and RepairsBe cautious during installation and maintenance. Follow all rulesand regulations to avoid electric shock and to prevent injury ordamage.! WARNINGELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Before installing, modifying, or servicing system, mainelectrical disconnect switch must be in the OFF position.There may be more than one disconnect switch. Lock outand tag switch with a suitable warning label.Static MaintenanceStatic Maintenance is maintenance during de--energization of theair conditioner.For static maintenance, make sure that the unit is de--energized andthe plug is disconnected.Dynamic MaintenanceDynamic maintenance is the maintenance during energization ofthe unit.Before dynamic maintenance, check the electricity and ensure thatthere is a good ground. Check if there is electricity on the case andcopper pipe of the air conditioner with a voltage tester.! WARNINGELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.A large--capacity electrolytic capacitor is used in the outdoorunit controller (inverter). When the power supply is turnedoff, charge (charging voltage DC280V to 380V) remainsand takes a long time to discharge.Do Not open the outdoor unit for 20 minutes after powerhas been turned OFF.Take sufficient care to avoid directly touching any of the circuitparts without first turning off the power.At times, such as when the circuit board is to be replaced, place thecircuit board assembly in a vertical position.Diagnose troubles according to the trouble diagnosis procedure asdescribed below.Also refer to the check points in servicing written on the wiringdiagrams attached to the indoor/outdoor units.No. Trouble Shooting Procedure1 Confirmation2 Code displays interpretation of error codes.3 Basic System CheckConfirmation:1. Confirmation of Power Supply: Confirm that the powerbreaker operates normally and provides power2. Confirmation Voltage: Confirm that voltage is AC220--240 10%. If voltage is not in this range, the unit maynot operate normally.