Carrier 42QH30-H Service Maintenance Manual

Contents

21TROUBLE CHART (Cont.)TROUBLE REASON ACTIONAir conditioner is not supplying enoughheating.Air flow cannot circulate freely Remove obstructions.Dirty filters reduce air quantity circulating. Clean air filtersDoors and/or windows are open. Close doors and windowsFan speed has been set to “Low” Set fan speed at high speed.Air flow direction is not correct Adjust airflow direction as per the modechosen.Selected temperature is Lower than theroom temperature in the heating mode.Correct selected temperature.A slight mist is emitted from the indoorunit during coolingThe cool air from the indoor unit iscoming into contact with the room air.Normal operationA slight whistling noise is heard when isheard when the air conditioner starts orstops.This is due to the refrigerant beginning tocirculate or an adjustment of therefrigerant pressures.Normal operationWater vapor (mist) emanating from theoutdoor unit.It is normal in heat pump operation, whendefrost is automatically activated.Normal operationUnpleasant smells coming from the indoorunit.Unpleasant smells can be caused bysubstances accumulated in the air filtersSwitch the system OFF and contact anauthorized service center to have the filterscleaned.Restart unit in the ventilation (fan only) modeand open windows to change room air.Strange noises coming from the indoorunit.Occasionally the indoor unit can emitsome strange short noises duringoperation or when it has stopped.These are generally due to the oftemperature changes on the plastic parts.Normal operationStarting in heating mode for heat pumpsystemsIf the system starts at low ambienttemperatures, it takes a little while toreach a comfortable room temperature.When the system is started by theremote control, it emits a signal beep, butthe louvre does not swing and the fandoes not run until the operatingtemperature has been reached.Normal operationFaulty return air sensor Determine reason and replaceFaulty return indoor coil sensor Determine reason and replaceTimer Led is BlinkingFaulty return outdoor coil sensor Determine reason and replaceCompressor overheat Determine reason and correctAnti overheat Determine reason and correctPower led is blinkingLow ambient Determine reason and correct

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