1. manufacturer
   dirt
2. clean filters

Dirt is the biggest enemy of a room air conditioner.

1. coils
   compressor
2. both answers

The coils, compressor and motor are all sealed. Service on these components must be done by a professional.

1. service at the repair shop
   service at home
2. both answers

Since the air conditioner is portable, you have the option to bring the unit to the technician.

1. Remove and store away.
   Cover with plastic hold in place with duct tape.
2. both answers

The unit should be protected from winter weather. Remove the unit or cover the portion that is exposed to the elements.

1. unplugging
   discharging the capacitor
2. both answers

Unplugging the unit is not enough. Before working on a room air conditioner, you must also discharge the capacitor.

1. Check the owner's manual.
   Leave it for a technician.
2. both answers

Check the owner's manual for instructions or have a technician do this.

1. at the beginning of the cooling season
   monthly when using
2. both answers

Clean or replace the filter at the beginning of the cooling season, and monthly while using the room air conditioner.

1. Wash it with soapy water.
   Thoroughly dry it.
2. both answers

Most units come with a washable filter. Wash with soapy water and thoroughly dry before replacing.

1. Replace only.
   Clean with soapy water.
2. It does not need replacement.

Cleaning a throwaway filter is not possible. You must replace it with the same type of filter.

1. measures voltage
   measures distance
2. measures sound

A volt-ohmmeter is an instrument to measure voltage.

1. less than zero
   zero
2. greater than zero

If the meter reads greater than zero, the cord should be replaced.

1. vacuum
   brush
2. wet sponge

Clean the coils with a vacuum cleaner.

1. at the start of the season
   every month while in use
2. both answers

Clean the coils at the start of the cooling season and every month that the unit is in use, or more frequently if the air conditioner is used in a very dusty space.

1. faulty switch
   dirty filter
2. dirty coils

If the unit is getting power and still will not operate on any setting, the switch may be faulty.

1. condensed water
   water vapor
2. both answers

Condensed water and water vapor are drained through the drain ports.

1. Set to lowest temperature.
   Check with a volt-ohmmeter.
2. both answers

For a thermostat with fewer than three lead wires, set the thermostat on the lowest temperature and check with a volt-ohmmeter set to the RX1 scale. If the scale reads greater than zero, replace the thermostat.

1. cleaning fan blades
   tightening fan blades
2. both answers

Cleaning and tightening the fan blades should prevent the noise.

1. several drops of 20-weight nondetergent motor oil in each port
   several drops of all-purpose oil in each port
2. several drops of 30-weight nondetergent motor oil in each port

If the fan has lubrication ports, put several drops of 20-weight non-detergent motor oil in each port.

1. clogged drain ports
   rain water
2. water vapor

Drain ports clogged with dirt may cause water to leak.

1. wire
   small knife
2. both answers

Use a wire or a small knife to clean the ports.