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Problem My Gas Furnace Will Not Heat! What Furnace Parts Might Cause This Problem?


Problem: My Gas furnace will not heat or work. What furnace parts might be the cause of this problem? 

Answer: We have this question asked lots. There are 6 main parts that can cause your furnace to not heat. Some of these parts can be blamed or misdiagnosed as bad when actually the part is good. The only way to find out if the part is bad or not is to do some testing. Below we have a really good super YouTube video where AC Service Tech LLC shows and explains what the 6 most frequently misdiagnosed parts are and how to test them. I have listed below the video many troubleshooting links where AC Service Tech explains how to troubleshoot each furnace part in detail. There are also links to the troubleshooting tools that AC Service Tech uses in the video. Thanks so very much to AC Service Tech LLC. for making these excellent informative videos!! Please email us anytime if you have questions. We would love to try and help you out and earn your business! Steve & Barbara Arnold

The 6 parts that are blamed and misdiagnosed most often are:

  1. Flame Rod or Flame Sensor- Usually cleaning the flame sensor will fix the problem.
  2. Gas Valve –AC Service Tech LLC has testing and troubleshooting links to YouTube Videos below.
  3. Pressure Switch-AC Service Tech LLC has testing and troubleshooting links to YouTube Videos below.
  4. Control Board-AC Service Tech LLC has testing and troubleshooting links to YouTube Videos below.
  5. Blower Motor is bad or on High-Efficiency furnaces, the ECM Blower Motor is diagnosed as bad-Many times a motor run capacitor can be replaced on PSC (Permanent Split Capacitor) blower motors and it will fix the blower motor problem. Most of the time the ECM motor module is bad and the motor is not actually bad. Replacing the motor module is less expensive than replacing the entire ECM motor.  AC Service Tech LLC has testing and troubleshooting links to YouTube Videos below.
  6. Heat Exchanger is bad. If one of your rollout switches is going off where you have to reset the rollout switch then this is a sure sign that you have a heat exchanger or venting problems. Make sure your condensate drain is open and your vent is not obstructed if you have a 92% or above condensing furnace that produces water during the winter.

Below we have a great video made by AC Service Tech LLC. that shows the

Below are many links to a more detailed explanation for troubleshooting the problems described in the video. Thanks so very much AC Service Tech LLC. 

Related Videos: -Top 10 Pressure Switch Problems- -Pressure Switch Troubleshooting- -Cleaning the Condensate Tubing-   -Pressure Switch Testing and Replacement- -The Pressure Switch Works- -Why The Pressure Switch Wont Work While the Condensate Drain is Clogged- -Using The SDMN6 to Test Pressure Switches- -ECM Blower Motor Testing: Make Your Own -ECM Tester-   -X-13 ECM Blower Motor Testing- -Variable Speed Blower Testing- -10 reasons Why The Blower Motor Won’t Turn On- -4 Reasons Why the Blower Motor Won’t Shut Off- -What Type Of Blower Motor Do I Have- -240 volt PSC Blower Motor Fan Speeds- -How to Tell the Difference Between Blower Fan Motors- -Gas Valve Troubleshooting- -Combination Gas Valve, How it Works- -Smart Valve Troubleshooting- -Furnace Flame Sensor and Rectification Troubleshooting- -Flame Rectification Works- -Single Rod Spark Ignition and Flame Rectification-   -Two Rod Spark Ignition and Flame Rectification- -Troubleshooting the Furnace Control Board- -Thermostat Wiring to a Furnace and AC Unit- -Heat Pump Thermostat Wiring Explained- -Thermostat Wiring Diagrams- -Clogged 90% Furnace Heat Exchanger- -Why the Furnace Sequence of Operation is Important- Electrical Diagnosis Tools: UEI DL389 Multimeter UEI DL479 Multimeter with temp sensor Magnet Jumpers- Alligator Jumpers- Irwin Wire Stripper/Cutter/Crimper Water Column Manometers FieldpieceSDMN6 Dual Manometer Pump – UEI Digital Dual Manometer – Supco Universal Adjustable Pressure Switch -.01wc -10.0wc – 3/16″ x 3/16″ x 3/16″ brass barbed tee – 1/8″ NPTF x 3/16″ barb fitting for reading wc pressure – Combustion and CO Detectors: Testo CO detector Testo 310 Res Combustion Analyzer 310 Res Combustion Analyzer with printer Testo 320 w printer Vacuum Tools: JB 6 CFM Vacuum Pump – CPS 4 CFM Vacuum Pump – Appion Valve Core Removal Tool – Appion Blue 3/8″ to 1/4″ Vacuum Hose – Appion Red 3/8″ to 1/4″ Vacuum Hose – Yellow Jacket 1/4″ by 1/4″ 3’ hose – Appion 1/4″ by 1/4″ and 3/8” hose – Uniweld 1/4″ by 1/4″ 2’ hose – CPS Vacuum Micron Gauge – Checking the Charge Tools: Yellow Jacket Refrigerant Gauge Set Refrigerant hoses with valves Compact Ball Valve for Refrigerant Hose QuickDisconnect 90 for refrigerant hose RectorSeal Bubble Gas Leak Detector Fieldpiece ST4 Dual Temp Meter Fieldpiece Bead K Type Temp Sensor Fieldpiece Wet Bulb Temp Sensor Fieldpiece TC24 Temp Clamp Refrigerant Leak Detection Tool: Accutrak VPE Ultrasonic Leak Detector

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