Keystone KSTHW12B - User Manual

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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: KSTHW08B

KSTHW12B

Questions and Answers

S
Sara EvansAug 14, 2025
Why is my Keystone KSTHW12B Air Conditioner not cold enough?
- N
  nicholas32Aug 14, 2025
  If the air from your Keystone air conditioner doesn't feel cold enough, consider the following: * If the room temperature is below 62°F (17°C), cooling may not occur until the room warms up. * The temperature sensor behind the air filter element might be touching the cold coil. Keep it away from the cold coil. * Try setting the unit to a lower temperature. * Wait for 3 minutes after setting the unit to COOL mode.
K
Kimberly PrestonAug 17, 2025
What to do if my Keystone air conditioner does not start?
- K
  kaylagonzalesAug 17, 2025
  If your Keystone air conditioner isn't starting, there are several potential causes: * The wall plug may be disconnected. Ensure it's firmly pushed into the outlet. * A house fuse might be blown, or a circuit breaker tripped. Replace the fuse with a time delay type or reset the circuit breaker. * The Plug Current Device may have tripped. Press the RESET button. * The power may be off. Turn the power ON.
S
Shannon DiazAug 21, 2025
Why is my Keystone KSTHW12B Air Conditioner cooling, but the room is too warm with no ice forming?
- M
  Matthew StephensAug 21, 2025
  If your Keystone air conditioner is running but the room isn't cooling down and there's no ice on the cooling coil, consider these possibilities: * The air filter might be dirty, restricting airflow. Clean the air filter. * The set temperature could be too high. Lower the temperature setting. * Air directional louvers may be positioned improperly. Adjust the louvers for better air distribution. * The front of the unit might be blocked by drapes, blinds, or furniture. Clear any blockage. * Doors, windows, or registers might be open. Close them. * Allow additional time for the unit to remove stored heat from walls, ceiling, floor, and furniture.
A
Andrea AndersonAug 25, 2025
Why is my Keystone air conditioner cooling, but the room is too warm and ice is forming?
- L
  Laurie RobertsAug 25, 2025
  If your Keystone air conditioner is cooling, but the room is too warm and ice is forming on the cooling coil, here's what might be happening: * The outdoor temperature may be below 64°F (18°C). Set the unit to FAN ONLY mode to defrost the coil. * The air filter may be dirty. Clean the filter and set to FAN ONLY mode to defrost. * The thermostat may be set too cold for night-time cooling. Set to FAN ONLY mode to defrost, then increase the temperature setting.
G
Gabriel SandovalAug 27, 2025
What to do if my Keystone KSTHW12B turns on and off rapidly?
- D
  Douglas VasquezAug 27, 2025
  If your Keystone air conditioner is turning on and off rapidly, it could be due to: * A dirty air filter restricting airflow. Clean the air filter. * Extremely hot outside temperatures. Increase the FAN speed to circulate air past the cooling coils more frequently.
C
Christina BassAug 31, 2025
Why is my Keystone room air conditioner too cold?
- P
  Patrick BryantAug 31, 2025
  If your Keystone air conditioner is making the room too cold, it might be because the set temperature is too low. Try increasing the set temperature.
L
Lauren WilliamsSep 3, 2025
What to do if my Keystone air conditioner is making noise when cooling?
- L
  Lindsey MullinsSep 3, 2025
  If your Keystone air conditioner is making noise while cooling: * The noise may be due to normal air movement. If it's too loud, try setting the fan to a slower speed. * Window vibration could be the cause, indicating poor installation. Refer to the installation instructions or check with the installer.
J
jennifer00Sep 6, 2025
What to do if water is dripping inside my Keystone KSTHW12B when it's cooling?
- S
  Stephen SimmonsSep 6, 2025
  If water is dripping inside your Keystone air conditioner while it's cooling, it's likely due to 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.
A
Andrew JohnsonSep 10, 2025
What to do if remote sensing is deactivating prematurely on my Keystone air conditioner?
- U
  ucrawfordSep 10, 2025
  If the remote sensing is deactivating prematurely on your Keystone air conditioner (for some models): * Ensure the remote control is within 20 feet and a 180° radius of the front of the unit. * Make sure there are no obstructions blocking the remote control signal.

Summary

IMPORTANT SAFETY INSTRUCTIONS

INSTALLATION INSTRUCTIONS

Attach Foam Seal and Install Cabinet into Window

Instructions for attaching foam seal and securing the cabinet into the window.

Complete Window Installation Steps

Install Cabinet into Wood Frame

Through-the-Wall Installation Process

Complete Through-the-Wall Installation

AIR CONDITIONER FEATURES

Electronic Control Operation

Guide to operating controls, turning unit on/off, and setting temperature.

Fan Speed, Modes, and Sleep Feature

How to adjust fan speeds, select modes, and use the sleep feature.

CARE AND CLEANING

Cabinet and Air Filter Cleaning

TROUBLESHOOTING TIPS

Troubleshooting: Unit Not Starting or Cooling

Solutions for unit not starting or insufficient cooling.

Troubleshooting: Rapid Cycling or Noise

Solutions for rapid unit cycling, noise, or water dripping.

Troubleshooting: Ice Formation and Room Temp

Addresses ice formation and when the room is too warm despite cooling.

Troubleshooting: Remote Sensing and Room Too Cold

Summary

IMPORTANT SAFETY INSTRUCTIONS

INSTALLATION INSTRUCTIONS

Attach Foam Seal and Install Cabinet into Window

Instructions for attaching foam seal and securing the cabinet into the window.

Complete Window Installation Steps

Install Cabinet into Wood Frame

Through-the-Wall Installation Process

Complete Through-the-Wall Installation

AIR CONDITIONER FEATURES

Electronic Control Operation

Guide to operating controls, turning unit on/off, and setting temperature.

Fan Speed, Modes, and Sleep Feature

How to adjust fan speeds, select modes, and use the sleep feature.

CARE AND CLEANING

Cabinet and Air Filter Cleaning

TROUBLESHOOTING TIPS

Troubleshooting: Unit Not Starting or Cooling

Solutions for unit not starting or insufficient cooling.

Troubleshooting: Rapid Cycling or Noise

Solutions for rapid unit cycling, noise, or water dripping.

Troubleshooting: Ice Formation and Room Temp

Addresses ice formation and when the room is too warm despite cooling.

Troubleshooting: Remote Sensing and Room Too Cold

Keystone KSTHW12B Specifications

General

Cooling Capacity	12, 000 BTU
Energy Efficiency Ratio (EER)	11.0
Voltage	115V
Amperage	10.5A
Dimensions	21.97 x 19.09 x 15.16 inches
Weight	70.5 lbs
Power Supply	115V, 60Hz
Operating Temperature	62°F - 90°F
Refrigerant	R-410A

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