1. AP2U Home
  2. Ap2U Knowledge Base- HOME

Basic Gas Furnace Operation And Diagnostics

In the modern age, just like automobiles, furnaces have gotten smarter. Most furnaces built since the mid 80's have got electronic control boards in which most have incorporated a "TROUBLESHOOTING" or "ERROR" Code System built into them. In most cases this will be in the form of a "FLASHING LED LIGHT" This LED bulb can be green, red or sometimes yellow/orange depending on the brand and model. In most cases if you look on the back of the door panel there will be reference to what the flashing lights mean which will lead you to the point of failure. This does not mean that part has failed so much as that it "DID ITS JOB" in the case of a thermal and/or limit switch failure but it will at least guide you to the area in which your heater has failed and with proper testing the use of these codes will help diagnose why it failed in the first place. Most furnaces will give what is called a "FLASH CODE" which means the LED will flash a certain amount of times then pause then flash the code again. 
Remember- some gas furnaces will attempt to light and run up to 3 times before they go into a "LOCKOUT MODE" then flash the code so you may have to wait until the system has locked out in some cases to see this code appear. 

Below is a list of basic functions that most gas fired furnaces follow as well as a few basic things to check along the way.
Read More
(0) Comments

NEW STYLE GE REFRIGERATOR WITH INVERTER TECHNOLOGY - COMPRESSOR - TESTING GUIDE

ATTACHED IS A GUIDE TO TESTING THE LATE MODEL GE REFRIGERATORS WITH INVERTER TECHNOLOGY COMPRESSORS. IT SHOWS HOW TO TEST COMPONENTS AS WELL AS THE INVERTER TEST PINS AND WHAT READINGS YOU SHOULD RECEIVE WHEN TESTING
Read More
(0) Comments

CUT TO FIT - WAVE GUIDE COVER

A "WAVE GUIDE COVER" WAVE GUIDE COVER'S MAIN JOB IS TO TRANSMIT MICROWAVE RADIATION AS WELL AS IT PREVENTS STEAM AND FOOD PARTICLES FROM INTERACTING WITH THE ELECTRICAL COMPONENTS WITHIN THE MICROWAVE. 

SKILL REQUIRED - LOW
Read More
(0) Comments

EASY REFRIGERATOR - COMPRESSOR RELAY TEST

REFRIGERATOR OR AIR CONDITIONER NOT COOLING?

TO DETERMINE IF YOUR IT IS YOUR COMPRESSOR OR IF ITS LOW OR EMPTY OF REFRIGERANT FOLLOW THESE SIMPLE STEPS WHICH MAY SAVE YOU BOTH TIME AND A TON OF MONEY IN GETTING YOUR SYSTEM UP AND RUNNING AGAIN 


Read More
(0) Comments

THE DREADED F1 CODE ON A WHIRLPOOL BRAND CLOTHES WASHER

THE DREADED F1 CODE ON A WHIRLPOOL BRAND CLOTHES WASHER
Read More
(0) Comments

*NOISY SPIN - OLDER MAYTAG / WHIRLPOOL TOP LOAD WASHERS - LA SERIES

THE MOST COMMON INCORRECTLY DIAGNOSED ISSUE ON AN OLDER MAYTAG / WHIRLPOOL TOP LOAD WASHER IS - "NOISY SPIN" MOST PEOPLE THINK IT WILL BE THE TUB BEARING HOWEVER IN OVER 35 YEARS I HAVE ONLY SEEN 1 THAT HAD TO BE CHANGED OUT DUE TO NOISE. THE TUB BEARING AND SEAL KIT GENERALLY ONLY NEEDS TO BE CHANGED OUT DUE TO WATER LEAKING FROM THE MAIN SEAL. - THE CULPRIT OF THIS "ALMOST JET ENGINE SOUND" IN SPIN IS USUALLY THE "BRAKE BEARING" AND CAN BE EASILY REPLACE WITH MINIMAL EFFORT AND COST
SEE BELOW FOR A BREAKDOWN AND LOCATION OF THIS PART # WP22003441
Read More
(0) Comments

279787 DRYER MOTOR - WIRING INSTRUCTIONS INCLUDING BROKEN BELT BREAK SWITCH

*THERE ARE 2 VERSIONS OF INSTRUCTIONS LISTED BELOW. BOTH OEM AND AFTERMARKET VERSIONS OF THIS MOTOR WIRE THE SAME DUE TO MANUFACTURERS CHANGES
Read More
(0) Comments
WR55X10942P REPLACEMENT GE REFRIGERATOR CONTROL BOARDS - WR55X10942

WR55X10942P REPLACEMENT GE REFRIGERATOR CONTROL BOARDS - WR55X10942

ISSUES AFTER REPLACING A GE REFRIGERATOR CONTROL BOARD - PART# WR55X10942P / WR55X10942
Read More
(0) Comments

REFRIGERATOR INVERTERS

Below is a simple test and run down to test your inverter board on your refrigerator. You will need a multimeter and some knowledge as to how to use it and read it correctly. 
Read More
(0) Comments
HOW TO TEST PART# 316233903 / 316233902 - TEMPERATURE SENSOR

HOW TO TEST PART# 316233903 / 316233902 - TEMPERATURE SENSOR

TESTING PROCEDURE FOR PART# 316233903 / 316233902 - TEMPERATURE SENSOR
RESISTANCE (IN OHMS) FOR CORRESPONDING TEMPERATURE IN FAHRENHEIT
Read More
(1) Comments

RCO210, RCO410 & RCO810 HARD START INSTALLATION INSTRUCTIONS

SEE ATTACHED PDF FOR SIMPLE TO USE HARD START KITS AND GET YOUR REFRIGERATOR COMPRESSOR UP AND RUNNING AGAIN 


Read More
(0) Comments
Y0310244. PR1. PR2, Converting Pressure Regulator from Natural Gas to LP Gas

Y0310244. PR1. PR2, Converting Pressure Regulator from Natural Gas to LP Gas

Converting Y0310244, PR1, PR2 & PR4 pressure regulators from natural gas to LP gas.
Read More
(0) Comments
TOP