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Before you call for service...

Troubleshooting Tips
Save time and money! Review the chart below first and 
you may not need to call for service.

Problem

Possible Causes

What To Do

■ 

The air conditioner is
unplugged.

■ 

The fuse is blown/circuit
breaker is tripped.

■ 

Power failure.

■ 

Airflow is restricted.

■ 

The THERMOSTAT may
not be set high enough.

■ 

The air filter is dirty.

■ 

The room may have been
hot.

■ 

Cold air is escaping.

■ 

Cooling coils have iced up.

■ 

Ice blocks the air flow and
stops the air conditioner
from cooling the room.

• Make sure the air conditioner plug is pushed

completely into the outlet.

• Check the house fuse/circuit breaker box and

replace the fuse or reset the breaker.

• If power failure occurs, turn the mode control to OFF.

When power is restored, wait 3 minutes to restart the
air conditioner to prevent tripping of the compressor
overload.

• Make sure there are no curtains, blinds, or furniture

blocking the front of the air conditioner.

• Turn the knob to a higher number. The highest

setting provides maximum cooling.

• Clean the filter at least every 2 weeks.

See the operating instructions section.

• When the air conditioner is first turned on you need

to allow time for the room to cool down.

• Check for open furnace floor registers and cold air

returns.

• Set the air conditioner's vent to the closed position.

• See Air Conditioner Freezing Up below.

• Set the mode control at LOW fan or with the

thermostat at the middle position.

Air conditioner
does not start.

Air conditioner
does not cool as it
should.

Air conditioner
freezing up.

Normal Operating 

• You may hear a pinging noise caused by water being picked up and thrown against the condenser

on rainy days or when the humidity is high. This design feature helps remove moisture and improve
efficiency.

• You may hear the thermostat click when the compressor cycles on and off.

• Water will collect in the base pan during high humidity or on rainy days. The water may overflow

and drip from the outdoor side of the unit.

• The fan may run even when the compressor does not.

Abnormal Operation

Summary of Contents for RH188

Page 1: ...igned and prepared at the factory under strict quality guide lines We are confident that this product will give you daily comfort and satisfaction if it is handled properly based on this owner s manual Please read carefully and thoroughly these operating instructions before installing your room air conditioner ...

Page 2: ...e chart of troubleshooting tips If you review our chart of Troubleshooting Tips first you may not need to call for service at all READ THIS MANUAL CAUTION Contact the authorized Service technician for repair or maintenance of this unit Contact the installer for installation of this unit The air conditioner is not intended for use by young children or infirm persons without supervision Young childr...

Page 3: ...ow Be sure not to do Be sure to follow the instruction Plug in the power plug properly Otherwise it will cause electrical shock or fire due to heat generation Do not operate or stop the unit by inserting or pulling out the power plug It will cause electrical shock or fire due to heat generation Do not damage or use an unspecified power cord It will cause electrical shock or fire If the power cord ...

Page 4: ... and turn off the breaker Since the fan rotates at high speed during operation it may cause an injury Do not put a pet or house plant where it will be exposed to direct air flow This could injure the pet or plant Do not use for special purposes Do not use this air conditioner to preserve precision devices food pets plants and art objects It may cause deterioration of quality etc Do not operate swi...

Page 5: ...tically controls cooling or heating but the fan runs continuously whenever the air conditioner is in operation If the room is too warm turn the thermostat control clockwise If the room is too cool turn the themostat control counterclockwise HEATER LAMP When the unit sets heating operation condition the green lamp is lighted When the frost settles on the heat exchanger of the outside defrosting is ...

Page 6: ... of air can be controlled horizontally or vertically by using the horizontal louver or vertical louver HORIZONTAL AIR DIRECTION CONTROL To control horizontal direction of air flow set to the ON position the air swing switch and the air flow will be swept horizontally by the automatic air swing system If you want to stop the air flow from moving switch off the air swing switch at the desired positi...

Page 7: ... CAUTION DO NOT operate the air conditioner without a filter because dirt and lint will clog it and reduce performance Safety Precautions Operating Instructions Installation Instructions Troubleshooting Tips 7 Grille and Case Turn the air conditioner off and remove the plug from the wall outlet before cleaning To clean use water and a mild detergent Do not use bleach or abrasives Outdoor Coils The...

Page 8: ...LOUVER 3 VERTICAL AIR DEFLECTOR HORIZONTAL LOUVER 4 AIR DISCHARGE 5 FRONT GRILLE 6 AIR INTAKE INLET GRILLE 7 AIR FILTER 8 CONTROL BOARD 9 POWER CORD 10 EVAPORATOR 11 CONDENSER 12 COMPRESSOR 13 BASE PAN 14 BRACE 1 Pull down front grille from the cabinet top 2 Push front grille s tips toward the cabinet in order to insert front grille s tabs into the cabinet 3 Open the inlet grille 4 Tighten the scr...

Page 9: ...uvers of the cabinet must remain exposed to the outside of the structure Do not install remove and reinstall the unit by yourself Improper installation will cause water leakage electrical shock or fire Please consult authorized dealer or specialist for the installation work Please note fault caused by improper installation is not covered by warranty Unit must be installed in an easily accessible a...

Page 10: ...er removed from the air may cause some water to collect To remove this excess water you can install the drain pan as detailed below 1 Take the drain pan which is located in the air discharge or on the barrier 2 Remove the hole rubber from the base pan for some models 3 Install the drain pan to the left corner of the cabinet with 4 or 2 screws 4 Connect the drain hose to the outlet located at the b...

Page 11: ...tains blinds or furniture blocking the front of the air conditioner Turn the knob to a higher number The highest setting provides maximum cooling Clean the filter at least every 2 weeks See the operating instructions section When the air conditioner is first turned on you need to allow time for the room to cool down Check for open furnace floor registers and cold air returns Set the air conditione...

Page 12: ...305 MontagueRoad WestEnd 4101 07 3840 5858 Southport Shop 1 48 Ferry Rd Southport 4215 07 5591 3670 South Australia Adelaide 84A Richmond Rd Keswick 5053 08 8375 5710 Western Australia Perth 45 Sarich Court Osborne Park 6017 08 9445 5901 For Service in outer areas please contact your NEC retailer for the address of the nearest Authorized NEC Service Centre NEC Australia Pty Ltd 244 Beecroft Road E...

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