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Keystone KSTHW12A - User Manual

Keystone KSTHW12A
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WINDOW/WALL TYPE
ROOM AIR CONDITIONER
-
Before using your air conditioner, please read
this manual carefully and keep it for future reference.
TABLE OF CONTENTS
Installation Instructions
...............................................10
4-9
Normal Sounds
....................................
......................................
Important Safety Instructions ..........................1-3
Troubleshooting Tip 13-14
.....................................
Air Conditioner Features 10-12
.............................
Care and Cleaning 12-13
Model: KSTHW08A
KSTHW12A

Table of Contents

Questions and Answers

  • C
    Carolyn TaylorAug 14, 2025
    Why is the air from my Keystone Air Conditioner not cold enough?
    • A
      atkinsdustinAug 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.
  • M
    Miguel GillespieAug 18, 2025
    What to do if my Keystone KSTHW12A is cooling, but the room is too warm and there is no ice forming?
    • L
      Linda MolinaAug 18, 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.
  • J
    James PorterAug 21, 2025
    Why is my Keystone Air Conditioner not starting?
    • C
      christopher82Aug 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.
  • M
    Michael SextonAug 25, 2025
    What to do if my Keystone Air Conditioner is cooling, but the room is too warm and ice is forming?
    • T
      Tracy GreenAug 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
    Richard MartinezAug 27, 2025
    What to do if my Keystone KSTHW12A turns on and off rapidly?
    • S
      sjohnsonAug 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.
  • B
    bdeanAug 31, 2025
    Why is my Keystone Air Conditioner making noise when cooling?
    • J
      James PollardAug 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.
  • S
    stonetannerSep 3, 2025
    What to do if water is dripping inside from my Keystone KSTHW12A Air Conditioner when cooling?
    • J
      jonesmarySep 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.
  • C
    Caitlin TaylorSep 6, 2025
    Why is my Keystone KSTHW12A Air Conditioner remote sensing deactivating prematurely?
    • J
      Jennifer BaileySep 7, 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.
  • M
    Mr. Kenneth WhiteSep 10, 2025
    Why is my room too cold with Keystone KSTHW12A Air Conditioner?
    • M
      mboothSep 12, 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

Introduction and Warning Symbols

Explains manual purpose, warning symbols, and basic operational safety.

General Operational Safety

Covers essential safety rules for operating the unit.

INSTALLATION INSTRUCTIONS

Tools and Parts

Lists required tools and supplied parts for installation.

Window Installation Preparation

Details location requirements, window opening measurements, and packaging removal.

Component Attachment

Instructions for attaching top channel and side curtains to the unit.

Cabinet Installation Methods

Guides on installing the cabinet into windows or through-walls.

Final Installation Steps

Covers completing window and through-wall installations and securing the unit.

NORMAL SOUNDS

Common Operational Sounds

Describes typical sounds the air conditioner may produce during operation.

AIR CONDITIONER FEATURES

Electronic Control Operation

Explains how to use the control panel and remote for unit functions.

Operating Modes and Settings

Details fan speeds, sleep, filter check, energy saver, and mode selections.

Special Features

Describes Follow Me and Timer functions for enhanced control.

Display Information and Errors

Explains display indicators, room temp, and error codes.

CARE AND CLEANING

Air Filter Maintenance

Provides instructions for cleaning and maintaining the air filter.

Cabinet Cleaning and Winter Storage

Instructions for cleaning the exterior and storing the unit during winter.

TROUBLESHOOTING TIPS

Common Problems and Solutions

Lists frequent issues and their remedies for self-help.

Additional Troubleshooting Scenarios

Addresses more issues like warm room, rapid cycling, noise, and water drips.

Keystone KSTHW12A Specifications

General IconGeneral
Typewindow
Colorwhite
Operating Area Size550 square feet
Cooling Capacity12000 british thermal units
Cooling Settings4
Heateryes
Heating Capacity11000 british thermal units
Moisture Removal2.5 pints per day
Fan Speeds3
Fan Airflow Rate279 cubic feet per minute
Filterwashable, mesh
Noise Level60.9 decibels adjusted
Remote Controlno
Wireless Connectivitynone
Timerno
Sleeping Modeyes
Control Typebutton
Display Typeled
Annual Energy Consumption11 kilowatt hours
Energy Efficiency10.9
Voltage230
Current15.2 amperes
Depth23 inches
Height16.1 inches
Width22.6 inches
Net Weight84 pounds

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