Keystone KSTHW08A - User Manual

Questions and Answers

Z
zwalkerAug 14, 2025
Why is the air from my Keystone Air Conditioner not cold enough?
- D
  dcrossAug 14, 2025
  If the air from your Keystone Air Conditioner isn't cold enough, it could be because the room temperature is below 62°F (17°C). Cooling may not occur until the room temperature rises above this level. Also, check that the temperature sensor behind the air filter isn't touching the cold coil. Ensure that the unit is set to a lower temperature and wait for 3 minutes after setting it to the COOL mode.
N
Nicole PerezAug 17, 2025
What to do if my Keystone KSTHW08A is cooling, but the room is too warm and there is no ice forming?
- A
  amandajonesAug 17, 2025
  If your Keystone Air Conditioner is cooling, but the room remains too warm and no ice is forming on the cooling coil, consider the following: * Ensure the air filter is clean. * Set the temperature to a lower setting. * Make sure the air directional louvers are positioned properly for better air distribution. * Clear any obstructions blocking the front of the unit, such as drapes or furniture. * Close any open doors, windows, or registers to prevent cold air from escaping. * If the unit was recently turned on in a hot room, allow additional time for the unit to remove stored heat.
M
Michael DavisAug 21, 2025
Why is my Keystone KSTHW08A Air Conditioner not starting?
- H
  Henry MartinAug 21, 2025
  If your Keystone Air Conditioner isn't starting, check these potential causes: * Ensure the wall plug is firmly pushed into the outlet. * Check for a blown fuse or tripped circuit breaker and replace the fuse or reset the breaker. * If the Plug Current Device has tripped, press the RESET button. * Verify that the power is turned ON.
B
Billy ChapmanAug 25, 2025
What to do if my Keystone KSTHW08A Air Conditioner is cooling, but the room is too warm and ice is forming?
- J
  joseph54Aug 25, 2025
  If your Keystone Air Conditioner is cooling but the room is too warm, and ice is forming on the cooling coil, it could be due to the outdoor temperature being below 64°F (18°C). To defrost the coil, set the unit to FAN ONLY mode. Also, the air filter may be dirty, so clean it. After defrosting, set the temperature to a higher setting.
R
rebecca16Aug 27, 2025
What to do if my Keystone Air Conditioner turns on and off rapidly?
- C
  Carolyn WardAug 27, 2025
  If your Keystone Air Conditioner is turning on and off rapidly, the issue could be a dirty air filter restricting airflow, so clean the air filter. Alternatively, if the outside temperature is extremely hot, set the fan speed to a higher setting.
C
Connie GallegosAug 31, 2025
Why is my Keystone KSTHW08A Air Conditioner making noise when cooling?
- L
  Lisa HendricksAug 31, 2025
  Some air movement sound is normal during cooling operation. If the noise is too loud, try setting the fan to a slower speed. If you notice window vibration, it might indicate a poor installation. Refer to the installation instructions or check with the installer.
N
Norman GonzalezSep 3, 2025
What to do if water is dripping inside from my Keystone Air Conditioner when cooling?
- M
  Mr. Austin GuzmanSep 3, 2025
  If water is dripping inside from your Keystone Air Conditioner during cooling, it typically indicates improper installation. Tilt the air conditioner slightly to the outside to allow for water drainage. Refer to the installation instructions or consult with the installer.
D
danieldavisSep 6, 2025
Why is my Keystone KSTHW08A remote sensing deactivating prematurely?
- K
  Kimberly ShahSep 6, 2025
  If the remote sensing is deactivating prematurely on your Keystone Air Conditioner, make sure the remote control is within 20 feet and a 180° radius of the front of the unit. Also, ensure that there are no obstructions blocking the remote control signal.
T
tbarnesSep 9, 2025
Why is my room too cold with Keystone KSTHW08A Air Conditioner?
- M
  Mario MurilloSep 9, 2025
  If your room is too cold while using your Keystone Air Conditioner, the set temperature may be too low. Increase the set temperature to a more comfortable level.

Summary

IMPORTANT SAFETY INSTRUCTIONS

General Safety Warnings

Covers essential safety warnings for operating the air conditioner, including electrical precautions and usage guidelines.

Specific Usage Precautions

Details specific do's and don'ts for safe operation, such as plug usage, wet hands, and cord handling.

IMPORTANT SAFETY INSTRUCTIONS

Material Handling and Environmental Safety

Provides safety guidelines for handling materials, protecting pets, and ensuring proper ventilation during operation.

User and Installation Safety

Outlines safety measures for users with reduced capabilities and emphasizes correct installation procedures.

IMPORTANT SAFETY INSTRUCTIONS

Power Cord Safety and Electrical Information

Details safety related to the power cord, including current detection devices and electrical requirements.

Accident Prevention and Operation Notes

Provides tips for preventing accidents and important notes regarding operation and installation.

INSTALLATION INSTRUCTIONS

Tools and Parts for Installation

Lists all necessary tools and supplied parts required to install the air conditioner.

Window Installation Overview

Guides through the initial steps for installing the unit in a window, including safety precautions.

INSTALLATION INSTRUCTIONS

Window Installation Requirements and Packaging

Details location requirements, window opening dimensions, and procedures for removing packaging materials.

INSTALLATION INSTRUCTIONS

Attaching Installation Components

Instructions for attaching the top channel and side curtains to the air conditioner cabinet.

INSTALLATION INSTRUCTIONS

Cabinet Installation and Sealing

Details how to attach the foam seal and securely install the air conditioner cabinet into the window.

Securing Side Curtains to Window Frame

Provides steps for extending and securing the side curtains to the window frame using screws and weather seals.

INSTALLATION INSTRUCTIONS

Completing Window Installation

Final steps for completing window installation, including inserting the unit and connecting power.

Through-the-Wall Installation Process

Guides on preparing and installing the unit through a wall opening, including frame construction.

INSTALLATION INSTRUCTIONS

Installing Cabinet into Wood Frame

Instructions for inserting the air conditioner cabinet into a pre-constructed wood frame opening.

Finalizing Through-the-Wall Installation

Completes the through-the-wall installation by inserting the unit, panel, and connecting power.

NORMAL SOUNDS

Identifying Normal Operating Sounds

Explains common sounds the air conditioner may make during normal operation, such as rushing air and vibration.

AIR CONDITIONER FEATURES

Electronic Control Panel Operation

Explains how to use the electronic control panel to turn the unit on/off and adjust settings.

AIR CONDITIONER FEATURES

Fan Speed, Sleep, and Filter Check

Details how to adjust fan speed, activate the sleep mode, and use the filter check reminder.

Energy Saver, Follow Me, and Mode Selection

Explains the Energy Saver, Follow Me features, and how to select operating modes like Auto, Cool, Dry, and Fan.

Timer Functionality

Provides instructions on setting the auto start and stop timer functions for the air conditioner.

AIR CONDITIONER FEATURES

Display Indicators and Error Codes

Explains the information shown on the display and how to interpret error codes.

Air Directional Louvers and Additional Tips

Details how to adjust air directional louvers and provides additional operational tips.

CARE AND CLEANING

Air Filter Cleaning Procedure

Step-by-step guide on how to clean the air filter to maintain unit efficiency and prevent frost buildup.

CARE AND CLEANING

Cabinet Cleaning and Winter Storage

Instructions for cleaning the exterior cabinet and proper procedures for winter storage.

TROUBLESHOOTING TIPS

Keystone KSTHW08A Specifications

General

Type	window
Color	white
Operating Area Size	349.8 square feet
Cooling Capacity	8000 british thermal units
Cooling Settings	4
Heater	yes
Heating Capacity	3500 british thermal units
Fan Speeds	3
Fan Airflow Rate	247.8 cubic feet per minute
Filter	washable, mesh
Noise Level	57.2 decibels adjusted
Remote Control	yes
Wireless Connectivity	none
Timer	no
Sleeping Mode	yes
Control Type	touchpad
Annual Energy Consumption	0 kilowatt hours
Energy Efficiency	10.9
Voltage	115
Current	11.7 amperes
Depth	23 inches
Height	16.1 inches
Width	22.6 inches
Net Weight	75.4 pounds