Carrier 42NQV025H Service Manual

Contents

– 72 –CheckcodeCheckcodeBlock distinctionJudgment and actionEven if trying operation again, alloperations stop immediately. :Replace P.C. board.1. Even if connecting lead wire ofcompressor is removed,position-detect circuit erroroccurred. : Replace P.C. board.2. Measure resistance betweenwires of compressor, andperform short-circuit. : Replacecompressor.Even if trying operation again, alloperations stop immediately. :Replace P.C. board.1. Check sensors (TE, TS).2. Check P.C. board.1. Check discharge temp. sensor(TD).2. Check P.C. boardPosition-detect error, over-currentprotective operation of outdoor fandrive system, fan lock, etc. :Replace P.C. board or fan motor.1. Check outdoor temp. sensor(TO).2. Check P.C. board.When 20 seconds passed afterstart-up, position-detect circuit erroroccurred. : Replace compressor.Trouble on P.M.V.1. Repeat Start and Stop withinterval of approx. 10 to 40minutes. (Code is not displayedduring operation.)Supply gas.(Check also gas leak).2. Unit operates normally duringcheck.If return serial signal does notstop between indoor terminalblock 2 and 3, replace inverterP.C. board.If signal stops between indoorterminal block 2 and 3, replaceindoor P.C. board.1. Trouble on compressor2. Trouble on wiring of compressor(Missed phase)1. Check dischage temp. sensor(TD).2. Gas leakage3. Trouble on P.M.V.1. Check power voltage.(220–230–240 V +10%)2. Overload operation of refrigera-tion cycleCheck installation condition(Short-circuit of outdoor diffuser).1. Check 4-way valve operation.BlockOutdoor P.C.boardNotdisplayedOutdoor P.C.boardOthers(includingcompressor)Operation of diagnosis functionCause of operationInverter over-currentprotective circuitoperates. (Short time)Position-detect circuiterror or short-circuitbetween windings ofcompressorCurrent-detect circuiterrorBeing out of place,disconnection or short-circuit of the outdoorheat exchanger sensor(TE) or suction temp.sensor (Ts)Disconnection or short-circuit of dischargetemp. sensorOutdoor fan drivesystem errorOutdoor heat exchangertemp. sensor errorCompressor drive outputerror, Compressor error(lock, missing, etc.),Break downReturn serial signal hasbeen sent whenoperation started, but itis not sent from halfway.1) Compressor thermo.operationGas shortageGas leak2) Instantaneous powerfailureCompressor does notrotate.(Current protectivecircuit does not operatewhen a specified timepassed after compressorhad been activated.)Discharge temp.exceeded 117°CBreak down ofcompressor4-way valve inverse error(TC sensor valuelowered during heatingoperation.)AirconditionerstatusAll offAll offAll offAll offAll offAll offOperationcontinuesAll offOperationcontinuesAll offAll offAll offOperationcontinuesRemarksDisplayed whenerror is detected.Displayed whenerror is detected.Displayed whenerror is detected.Displayed whenerror is detected.Displayed whenerror is detected.Displayed whenerror is detected.——Displayed whenerror is detected.Flashes whentrouble is detectedon return serialsignal, and normalstatus when signalis reset.Displayed whenerror is detected.Displayed whenerror is detected.Displayed whenerror is detected.——FILE NO. SVM-07013