York YUKC 07-18 Installation & Owner's Manual

Contents

22 ENGLISHTROUBLE SHOOTING GUIDEProblem Probable cause RemedyA. The air conditioner does notrun.1. Power failure.2. Fuse blown or circuit breakeropen.3. Voltage is too low.4. Faulty contactor or relay.5. Electrical connections loose.6. Thermostat adjustment too low(in heating mode) or too high (incooling mode).7. Faulty capacitor.8. Incorrect wiring, terminal loose.9. Pressure switch tripped.1. Wait for power resume.2. Replace the fuse or reset thebreaker.3. Find the cause and fix it.4. Replace the faulty component.5. Retighten the connection.6. Check thermostat setting.7. Find the cause then replace ca-pacitor.8. Check and retighten.9. Find the cause before reset.B. The outdoor fan runs but thecompressor will not start.1. Motor winding cut or grounded.2. Faulty capacitor.1. Check the wiring and the com-pressor winding resistance.2. Find the cause then replace ca-pacitor.C. There is insufficient heatingor cooling.1. There is a gas leak.2. Liquid and gas line insulated to-gether.3. The room was probably very hot(cool) when you started the sys-tem.1. Remove charge, repair, evacu-ate and recharge.2. Insulate them separately.3. Wait while unit has enough timeto cool the room.D. The compressor runs con-tinuously.1. Thermostat adjustment too low(in heating mode) or too high (incooling mode).2. Faulty fan.3. Refrigerant charge too low, leak.4. Air or incondensables in refriger-ant circuit.1. Check thermostat setting.2. Check condenser air circulation.3. Find leak, repair and recharge.4. Remove charge, evacuate andrecharge.E. The compressor starts butshuts down quickly.1. Too much or too little refrigerant.2. Faulty compressor.3. Air or incondensables in refriger-ant circuit.4. Changeover valve damaged orblocked open (heat pump unit).1. Remove charge, evacuate andrecharge.2. Determine the cause and replacecompressor.3. Remove charge, evacuate andrecharge.4. Replace it.F. Clicking sound is heard fromthe air conditioner.In heating or cooling operation anyplastic parts may expand or shrinkdue to a sudden temperature changein this event, a clicking sound mayoccur.In heating or cooling operation anyplastic parts may expand or shrinkdue to a sudden temperature changein this event, a clicking sound mayoccur.J368-EN.indd 22 2/1/07 9:41:37 AM

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