Carrier 42NQV025H Service Manual

Contents

– 86 –Table 11-8-1No.123ProcedureTurn off the power supply breakerand remove the P.C. boardassembly from electronic partsbase. Remove the connectingcables from the terminal block.Remove the connector of themotor and turn on the powersupply breaker. If OPERATIONindicator flashes (once persecond), it is not necessary tocheck steps (1 to 3) in the rightnext column.Push [START/STOP] button onceto start the unit. (Do not set themode to On-Timer operation.)Shorten the restart delay timerand start unit.Push [START/STOP] button onceto start the unit,• Shorten the restart delay timer.• Set the operation mode toCOOL.• Set the fan speed level toAUTO.• Set the preset temperaturemuch lower than the roomtemperature. (The unit (com-pressor) operates continuouslyin the above condition.)If the above condition (No. 5) stillcontinues, start the unit in thefollowing condition.• Set the operation mode toHEAT.• Set the preset temperaturemuch higher than room tem-perature.Check whether or not the fuse (F01)is blown.Check power supply voltage :1. Between No. 1 and No. 3 of CN23(AC 220–240V)2. Between and of C03(DC 310–340V)3. Between of C10 and outputside of IC08 (DC 15V)4. Between 12V and GND5. Between 5V and GNDCheck power supply voltage :1. Between CN51 andNo. 1 of CN01 (DC 15–60V)1. Check whether or not the com-pressor operates.2. Check whether or not the OP-ERATION indicator flashes.1. Check whether or not the com-pressor operates.2. Check whether or not the OP-ERATION indicator flashes.Impulse voltage was applied or theindoor fan motor short-circuited.1. The terminal block or the crossovercable is connected wrongly.2. The capacitor (C01), line filter(L01), resistor (R02), or the diode(DB01) is defective.3. IC11, IC13 and T101 are defective.4. IC11, IC13 and T101 are defective.5. IC11, IC13, IC14 and T101 aredefective.IC51 and IC52 are defective.The indicators are defective or thehousing assembly (CN21) is defective.1. The temperature of the indoor heatexchanger is extremely low.2. The connection of the heat ex-changer sensor is loose.(The connector is disconnected.)(CN62)3. The heat exchanger sensor and theP.C. board are defective.(Refer to Table 11-4-1.)4. The main P.C. board is defective.1. The temperature of the indoor heatexchanger is extremely high.2. The connection of the heat ex-changer sensor short-circuited.(CN62)3. The heat exchanger sensor and theP.C. board are defective.(Refer to Table 11-4-1.)4. The main P.C. board is defectiveFILE NO. SVM-07013Check whether or not all indicators(OPERATION, TIMER, FAN-ONLY,HI-POWER) for 42NQV045Mand (OPERATION, TIMER,FILTER, HI-POWER,for 42NQV045H are lit for 3 secondsFAN-ONLY,FILTER,NIGHT-LIGHT, 7-SEGMENT)(42NQV045H, 42NQV045M)and they return to norma 3 secondslater.456