Friedrich WallMaster 2009

Questions and Answers

A
Andrea SimmonsJul 29, 2025
What to do if my Friedrich WallMaster 2009 unit does not run?
- S
  shawn54Jul 29, 2025
  If your Friedrich air conditioner isn't running, there are several things to check: * **Blown fuse or tripped circuit:** Replace the fuse or reset the breaker. If this happens repeatedly, check the fuse or breaker size and look for shorts in the unit's wiring and components. * **Power cord:** Ensure the power cord is properly plugged in. * **System switch:** Make sure the system switch is not in the “OFF” position. * **System switch or control board:** Test the system switch for continuity. * **Wiring:** Inspect for loose or disconnected wiring at the switch, control board, or other components. Reconnect according to the wiring diagram.
R
Richard TranAug 6, 2025
What to do if the evaporator coil freezes up in my Friedrich WallMaster 2009 Air Conditioner?
- C
  Chase WelchAug 6, 2025
  If the evaporator coil in your Friedrich air conditioner is freezing up: * **Filter:** Clean the filter as recommended in the Owner’s Manual. * **Airflow:** Check for a dirty or obstructed coil and clean it using a pressure wash or biodegradable cleaning agent. * **Thermostat or thermistors:** Test the thermostat and thermistors for continuity. * **Refrigerant:** De-ice the coil and check for refrigerant leaks. * **Fan motor:** Test the fan motor and replace it if inoperative. * **Capillary tube:** De-ice the coil, check the temperature differential across it, touch test the coil return bends for the same temperature, and test for low running current if a partially restricted capillary tube is suspected.
S
Shannon HernandezAug 11, 2025
Why does my Friedrich WallMaster 2009 Air Conditioner compressor run constantly and not cycle off?
- B
  Brandy WalkerAug 11, 2025
  If the compressor in your Friedrich air conditioner runs continually and doesn't cycle off: * **Heat load:** The unit may be undersized. Test cooling performance and replace with a larger unit if needed. * **Line restriction:** Check for a partially iced coil and check the temperature split across the coil. * **Refrigerant leak:** Look for oil at silver soldered connections, a partially iced coil, check the split across the coil, and check for low running amperage. * **Thermostat contacts:** Check the operation of the thermostat. Replace it if the contacts remain closed. * **Wiring:** Refer to the appropriate wiring diagram to ensure the thermostat is correctly wired. * **Thermistor:** Replace the thermistor or electronic control board if the thermistor is shorted.
H
hcomptonAug 15, 2025
How to troubleshoot a Friedrich WallMaster 2009 when the fan motor does not run?
- M
  masontroyAug 15, 2025
  If the fan motor on your Friedrich air conditioner isn't running, check these items: * **System switch:** Test the switch and replace it if inoperative. * **Wiring:** Refer to the applicable wiring diagram to check the wiring. * **Capacitor:** Test the capacitor and replace it if inoperative. * **Fan speed switch:** Test the switch and replace it if inoperative. * **Fan motor:** Test the fan motor and replace it if inoperative (be sure the internal overload has had time to reset).
T
Thomas HernandezAug 25, 2025
Why doesn't my Friedrich Air Conditioner turn off when I use the thermostat?
- T
  tsmithAug 25, 2025
  If the thermostat (T-stat) on your Friedrich air conditioner does not turn the unit off: * **Stuck contacts:** Disconnect power to the unit. Remove the cover of the thermostat and check if the contacts are stuck. If so, replace the thermostat. * **Temperature setting:** Turn the thermostat to a higher temperature setting to see if the unit cycles off. * **Wiring:** Refer to the appropriate wiring diagrams to ensure correct wiring. * **Unit size:** Refer to an industry standard sizing chart to ensure the unit is appropriately sized for the area being cooled. * **Thermistor:** Replace the thermistor or electronic control board if the thermistor is defective.
J
Jackie LynnNov 2, 2025
Why is my Friedrich Air Conditioner not cooling properly?
- D
  David FrostNov 2, 2025
  If your Friedrich air conditioner doesn't cool or only cools slightly, consider the following: * **Unit size:** Ensure the unit isn't undersized by referring to an industry standard sizing chart. * **Thermostat:** Set the thermostat to the coldest position and test it, replacing if necessary. * **Filter:** Clean the filter as recommended in the Owner’s Manual. * **Coils:** Clean any dirty or restricted condenser or evaporator coils using a pressure wash or biodegradable cleaning agent. * **Air circulation:** Adjust the discharge louvers and use a high fan speed to improve air circulation. * **Air doors:** Close any open fresh air or exhaust air doors. * **Refrigerant:** Check for leaks if the unit has low capacity due to undercharge and repair any leaks. * **Compressor:** ...
M
Michael RoseNov 19, 2025
What to do if the compressor in my Friedrich WallMaster 2009 Air Conditioner does not run?
- C
  Cheryl CarterNov 19, 2025
  If the compressor on your Friedrich air conditioner isn't running, here's what to investigate: * **Low voltage:** Check the voltage at the compressor. Note that 115V & 230V units will operate at a 10% voltage variance. * **Thermostat:** Set the thermostat to the coldest position. Test the thermostat and replace it if inoperative. * **Compressor overload:** Hard start the compressor. Direct test the compressor. If the compressor starts, add starting components. * **Compressor windings:** Check for continuity & resistance in the compressor windings. * **Overload protector:** Test the overload protector and replace it if inoperative. * **Capacitor:** Test the capacitor and replace it if inoperative. * **System switch:** Test the system switch for continuity in all positions. Re...

Summary

Technical Support Contact Information

Important Safety Information

Personal Injury or Death Hazards

Details hazards related to bodily harm or fatalities during service.

Refrigeration System Hazards

Safety warnings specific to refrigerant handling and system risks.

Mechanical Hazards

Safety precautions for working with moving or sharp mechanical parts.

Property Damage Hazards

Warnings to prevent damage to the unit or surrounding property.

Introduction to Service Manual

WallMaster Model Number and Serial Number Identification

Model Number Code Breakdown

Explains the structure and meaning of the unit's model number.

Performance Data and Dimensions

Electrical Data and Ratings

Plug;Outlet;Circuit Rating

Specifies required plug types, outlets, and circuit breakers for models.

Functional Components Overview

Component Types and Descriptions

Explanation of the function and purpose of various unit components.

Operating the WallMaster

Control Panel Operation Guide

Step-by-step guide for using the electronic control panel.

Setting Timer Functions

How to program start and stop times for unit operation.

Automatic Component Protection

Explanation of the built-in protection for the compressor and unit.

Setting the Hour Clock

Procedure for setting the unit's internal clock.

Setting the Timer

Instructions for programming start and stop timer functions.

Testing the Electronic Control

Error Code Mode Access

How to access and interpret error codes displayed by the control panel.

Error Code Listings

WS Model Error Codes

Specific error codes and their meanings for WS models.

WE;WY Model Error Codes

Specific error codes and their meanings for WE/WY models.

Rotary Controls System Control Switch

System Control Switch Test

Procedure for testing continuity of the system control switch.

Electronic Control Operation and Testing

Heat Pump with Electric Heat Operation

Operation sequence for heat pump units with electric heat assist.

Thermostat and Fan Motor Testing

Procedures for testing thermostat and fan motor components.

Capacitors and Defrost Control

Capacitor Testing and Connections

Guides on testing capacitors and proper terminal connections.

Defrost Control Operation (WY Models)

Explanation of the defrost control for WY models.

Heating Element and Drain Pan Valve

Heating Element Description

Information on the 3.3 KW heating element and its limit switches.

Drain Pan Valve Function

How the temperature-sensitive drain valve operates.

Refrigeration System Sequence of Operation

Sealed Refrigeration System Repairs

Equipment Required for Repairs

List of necessary tools and equipment for refrigeration system service.

Refrigerant Charging Guidelines

Guidelines and warnings for proper refrigerant charging procedures.

Method of Charging and Repairs

Refrigerant System Diagnosis

Undercharged Refrigerant Systems

Symptoms and checks for systems with insufficient refrigerant.

Overcharged Refrigerant Systems

Symptoms and checks for systems with excess refrigerant or noncondensables.

Restricted Refrigerant System Troubleshooting

Hermetic Components Check

Capillary Tube System Check

Steps to check for restricted capillary tubes in the system.

Check Valve Operation

How the two-way check valve functions in cooling and heating modes.

Reversing Valve Description and Operation

Testing the Coil and Reversing Valve

Solenoid Coil Electrical Test

Checks for electrical continuity and grounding of the reversing valve coil.

Reversing Valve Operational Check

Methods to test if the reversing valve shifts correctly between modes.

Reversing Valve Touch Test and Replacement

Touch Test in Heating;Cooling Cycle

Indications of valve position based on temperature differences.

Procedure For Changing Reversing Valve

Step-by-step guide for replacing the reversing valve.

Compressor Checks

Locked Rotor Voltage (L.R.V.) Test

Procedure to measure available voltage to the compressor under stalled conditions.

Amperage (L.R.A.) Test

Measuring running amperage and locked rotor amperage of the compressor.

Compressor Resistance and Efficiency Tests

Single Phase Resistance Test

Using an ohmmeter to test compressor motor winding resistance.

Checking Compressor Efficiency

Identifying faulty compressor valves based on operating pressures.

Compressor Replacement Procedure

Special Procedure for Motor Compressor Burnout

Routine Maintenance

Air Filter Maintenance

Instructions for cleaning and replacing the air filter.

Coils and Base Pan Cleaning

Procedures for inspecting and cleaning coils and the base pan.

Blower Wheel, Housing, and Fan Maintenance

Maintenance for blower components and condenser fan.

Electronic;Electrical;Mechanical Inspection

Periodic checks of control components and electrical systems.

Routine Maintenance (Continued)

Sleeve and Drain Maintenance

Inspecting and cleaning the wall sleeve and drain system.

Front Cover Cleaning

Instructions for cleaning the unit's front cover.

Troubleshooting Tips: Cooling Only Models

Compressor Does Not Run

Troubleshooting steps when the compressor fails to start.

Fan Motor Does Not Run

Troubleshooting steps when the fan motor does not operate.

Poor Cooling Performance

Diagnosing issues causing poor or no cooling performance.

Troubleshooting Tips: Cooling Only Models (Continued)

Unit Does Not Run

Troubleshooting power issues, switch failures, and wiring problems.

Evaporator Coil Freezes Up

Diagnosing and resolving issues causing the evaporator coil to freeze.

Compressor Runs Continually

Troubleshooting why the compressor fails to cycle off.

T-stat Does Not Turn Unit Off

Diagnosing thermostat issues preventing unit shutdown.

Troubleshooting Tips: Cooling Only Models (Continued)

Noisy Operation

Identifying and resolving causes of abnormal noise from the unit.

Water Leaks Into Room

Troubleshooting causes of water leakage into the room.

Troubleshooting Tips: Cooling Only Models (Continued)

Water and Moisture Issues

Addressing water spitting, excessive moisture, and external leaks.

Cycling and Thermostat Issues

Troubleshooting short cycling and prolonged off periods.

Heat Pump Troubleshooting

Uneven Room Temperature (Heating)

Diagnosing inconsistent temperatures during the heating cycle.

Unit Will Not Defrost

Troubleshooting issues preventing the unit from defrosting.

Insufficient Heating Performance

Diagnosing problems with insufficient heating performance.

Heat Pump Troubleshooting (Continued)

Unit Cools When Heat is Called For

Troubleshooting cooling operation during heating mode.

Heating Insufficient

Diagnosing causes of inadequate heating output.

Reversing Valve Troubleshooting: Touch Test Chart

WallMaster Wiring Diagram: Electronic Control (Cool Only Models)

WallMaster Wiring Diagram: Electronic Control (Cool with Electric Heat Models)

WallMaster Wiring Diagram: Electronic Control (Heat Pump with Electric Heat Models)

WallMaster Wiring Diagram: Electromechanical Control (Cool with Electric Heat Models)

WallMaster Wiring Diagram: Electromechanical Control (Heat Pump with Electric Heat Models)

Installation Accessories

Drain Kit (DK) Installation

Installation instructions for the DK drain kit.

Sub Base (SB) Installation

Installation instructions for the SB sub base accessory.

Internal Drain Kit (IDK) Installation

Installation instructions for the IDK internal drain kit.

Baffle Adapter Kit (BAK) Installation

Installation instructions for the BAK baffle adapter kit.

Installation Instructions for WSC Sleeve

Installation Instructions for Internal Drain Kit (IDK)

Sealing Gasket Installation Instructions

Installation Instructions for Drain Kit (DK)

Installation Instructions for Sub Base

Installation Instructions for Architectural Grille Model AG

WallMaster Limited Warranty