Carrier 42QH30-H Service Maintenance Manual

Contents

19TROUBLE SHOOTING (Cont.)TROUBLE REASON ACTIONHead pressure too low Low refrigerant chargeRestriction in liquid tubeIndoor section air filter dirtyCheck for leaks, repair and rechargeRemove restrictionClear filterExcessive section pressure Reversing valve hung up or internal leakInternal pressure relief openRefrigerant over chargedReplaceCheck for source and eliminatePurge excess refrigerantSuction pressure too low(Low pressure control cuts-out & pilotlight for low pressure control lights off)Low refrigerant chargeIndoor unit frostedLow indoor air or short cyclingRestriction in suction tubeCapillary or accurate restricted or ice cloggedCheck for leaks, repair and rechargeSee next troubleEliminate cause, check for fan workingLocate restriction and removeBlow refrigerant, evacuate system andrechargeOutdoor fan stopped or cycling onoverloadDetective fan motor capacitorLoose leads at fan motorFan motor burned outMotor bearing sizedReplaceCheck for cause and eliminateReplaceCheck for cause and eliminateAfter batteries have been placed intothe remote control, the display is not lit.Batteries are exhausted or have the wrongpolarity.Replace batteries or check polarity.When pressing the recessed lockadjustment button, hour figures ondisplay do not flash.Recessed button has not been pressedcorrectly.Press with a round point, avoid exertingstrong pressureRecessed button for time setting is blocked dueto excessive pressure during use.Check and repair.When pressing any button, all symbolsappear on display.Remote control has been irreversibly damaged. Replace with a new one.Main switch is OFF. Switch it to ON position.Remote control batteries are exhausted. Replace batteries.Remote control has not been pointed correctlyto the receiver of indoor unit.Turn remote control OFF and repeat theoperation in the correct direction.There are obstacles (curtains, walls, etc.)between the remote control and the indoor unitRepeat the operation after havingremoved the obstacles.Receiver on the indoor unit or the remotecontrol is under intense sun radiation.Avoid direct sun on the unit, shut curtainsor shades.When pressing start button, unit doesnot acknowledge signal with a beep.Signal transmission is obstructed by severeinterference from an electromagnetic field.Avoid sending signals when computers orhousehold appliances (Food processors,coffee makers, etc.) are operating closeby cellular or cordless telephones mayalso interfere with the control.

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