Zenith air conditioner troubleshooting

If the air conditioner suddenly started to work poorly, stopped switching on or stopped cooling the air, the first thing you need to do is to diagnose and detect the cause of the failure. If the warranty period is over, you can make simple repairs on your own.

Zenith ZW5000 air conditioner troubleshooting

COMPLAINTCAUSEREMEDY
Fan motor will not run.No powerCheck voltage at outlet. Correct if none.
Power supply cordCheck voltage to rotary switch. If none, check power supply cord. Replace cord if circuit is open.
Rocker switchCheck switch continuity. Refer to wiring diagram for terminal identification. Replace switch if defective.
Wire disconnected or connection looseConnect wire. Refer to wiring diagram for terminal identification. Repair or replace loose terminal.
Capacitor (Discharge capacitor before testing.)Test capacitor.
Replace if not within ±10% of manufacturer’s rating. Replace if shorted, open, or damaged.
Will not rotateFan blade hitting shroud or blower wheel hitting scroll. Re-align assembly.
Units using slinger ring condenser fans must have 0.22-0.25 inch clearance to the base.
If necessary, shim up the bottom of the fan motor with mounting screw(s).
Check fan motor bearings; if motor shaft will not rotate, replace the motor.
Fan motor runs.Revolves on overloadCheck voltage.
If not within limits, call an electrician.
Test capacitor.
Check bearings. Does the fan blade rotate freely?
If not, replace fan motor.
Pay attention to any change from high speed to low speed. If the speed does not change, replace the motor.
Fan motor noise.Tubo FanIf cracked, out of balance, or partially missing, replace it.
Axial FanIf cracked, out of balance, or partially missing, replace it.
Loose set screwTighten it.
Worn bearingsIf knocking sounds continue when running or loose, replace the motor. If the motor hums or noise appears to be internal while running, replace motor.
Compressor will not run, fan motor runs.VoltageCheck voltage. If not within limits, call an electrician.
WiringCheck the wire connections; if loose, repair or replace the terminal. If the wires are discon- nected, refer to wiring diagram for identification, and replace the wires. Check the wire connections; If not according to the wiring diagram, correct the connections.
Rocker SwitchCheck for continuity, refer to the wiring diagram for terminal identification. Replace the switch if the circuit is open.
ThermostatCheck the position of knob. If not at the coldest setting, advance the knob to this setting and restart the unit.
Check the continuity of the thermostat. Replace the thermostat if the circuit is open.
Capacitor (discharge capacitor before servicing.)Check the capacitor.
Replace if not within ±10% of manufacturer's rating, replace if shorted, open, or damaged.
CompressorCheck the compressor for open circuit or ground. If open or grounded, replace the compressor.
OverloadCheck the compressor overload if externally mounted. Replace if open. (If the compressor temperature is high, remove the overload, cool, and retest.)
Compressor cycles on overload.Fan motorIf not running, determine the cause. Replace if required.
Condenser air flow restrictionRemove the cabinet, inspect the interior surface of the condenser. If restricted, clean carefully with a vacuum cleaner (do not damage fins) or brush. Clean the interior base before re-assembling.
Condenser fins (damaged)If the condenser fins are closed over a large area on the coil surface, head pressures will increase, causing the compressor to cycle. Straighten the fins or replace the coil.
CapacitorTest the capacitor.
WiringCheck the terminals. If loose, repair or replace.
Refrigeration systemCheck the system for a restriction.
Insufficient coolingAir filterIf restricted, clean or replace.
Unit undersizedDetermine if the unit is properly sized for the area to be cooled.
Excessive noiseTurbo Fan or Axial FanCheck the set screw, or clamp. If loose or miss- ing, correct. If the tubo fan or axial fan is hitting scroll or barrier, rearrange the air handling parts.
Copper tubingRemove the cabinet and carefully rearrange the tubing not to contact the cabinet, compressor, shroud, and barrier.
PROBLEMCAUSESEXPLANATION / ACTION
• The fan speed can no longer be adjusted with the remote control.• Check that the appliance is not in AUTO or DRY mode.• In these 2 modes, the product selects its own fan speed.
• The infrared transmission indicator is no longer appearing on the remote control.• Check whether the remote control batteries are inserted and that they are not flat.• Insert batteries in the remote control or change them.
• The set temperature is no longer appearing on the remote control.• Check whether the remote control batteries are inserted and that they are not flat.• Insert batteries in the remote control or change them.
• Check whether the remote control is programmed to be in fan only mode.• In fan only mode, the set temperature is not displayed.
• The TIMER ON, TIMER OFF or TIMER ON OFF indicator disappears from the remote control display after a certain time has elapsed.• Check whether the programmed duration has elapsed.• Once the programmed duration has elapsed, the indication disappears from the remote control.
• There is no BEEP sound from the receiver to indicate that a signal is received when the ON/OFF button is pressed.• Ensure that the remote control batteries are not flat.• Change the remote control batteries if necessary.
• Ensure that the remote control emitter is correctly positioned towards the receiver and that there are no obstructions between them.• Position the remote control correctly towards the receiver and press ON/OFF again.
• None of the remote control buttons are working.• The remote control processor is blocked.• Press the reset button on the remote control.
• The product is not starting.• There is no electric current in the building.• Wait for the electricity supply to be reconnected in the building.
• The product has been disconnected.• Reconnect the product to the electricity supply.
• The fuses have blown.• Replace the fuses.
• The remote control batteries are flat.• Replace the remote control batteries.
• The TIMER ON programming function is selected and is preventing the product from working.• Wait for the TIMER ON programme to end or cancel the TIMER programme.
• The product is not supplying enough heat or cold even though the indoor unit fan is working.• The set temperature is not suitable.• Select a more suitable set temperature.
• The mechanical air outlet vents are almost closed.• Re-position the mechanical vent using the remote control.
• The dust filters are clogged.• Clean the dust filters.
• Doors or windows are open.• Close doors or windows.
• The air inlets of the indoor or outdoor units are obstructed.• Clear the unit’s air inlets before restarting the product.
• The compressor time delay mechanism (3 minutes) is in process.• Wait until the compressor time delay has finished.
• The indoor unit is not working in cooling or dehumidifying mode (but is working in heating mode).• If the product is a multisplit type product and if one of the indoor units is set to heating mode, none of the other indoor units can function in cooling or dehumidification modes.• Set all the multisplit indoor units to either cooling, dehumidification, or to stop.