Gas Furnace Category Index
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Furnace Breaker Trips
Furnace Breaker Trips - Furnace breakers most often occur for a few reasons: a bad circuit breaker a bad furnace fan motor or component poor airflow through the furnace Let's explore these reasons in detail and find out what you can do to fix a furnace breaker trip....
Gas Furnace Number 1 Problem Flame Sensor
Gas Furnace Number 1 Problem Flame Sensor - What is the number one trouble call for gas furnaces? We went through our records and found the number one problem for a gas furnace troubleshooting call is the flame sensor. If the flame sensor is not functioning as...
How Hot Surface Ignition Works
How Hot Surface Ignition Works - Hot surface ignition is a method of lighting a gas furnace. It is used in many different types of gas furnaces in use today. You may be wondering how hot surface ignition works? Therefore we decided to write an article on it so you can...
Why is My Furnace Leaking Water
Why Is My Furnace Leaking Water? Paul, Last year my husband and I purchased a brand new gas furnace and air conditioner split system. We followed your advice and want to thank you. It is much improved over the old system and the utility bills are lower. Everything...
Why Does My Pilot Light Keep Going Out
Why Does My Pilot Light Keep Going Out The pilot going out is a common occurrence for those that have water heaters or older gas furnaces. These types of heat appliances utilize pilot lights to light the main burner. That can turn into a nuisance for both maintaining...
Furnace Smells Like Gas | Why and What to Do
Furnace Smells Like Gas - Hello, I have a gas furnace in my house for home heating. It is in the attic. My wife and I were in the attic reorganizing some things, and the furnace was off. On occasion, I got a whiff of gas. I know natural gas is odorless, but they add...
New Thermostat Problem or Gas Furnace Issue
New Thermostat Problem or Gas Furnace Issue - Richard, I have a natural gas thermostat I just replaced this with a new Honeywell thermostat. It was working fine, but in the last couple of days, I have to switch it off then on to get the unit to run and heat. It never...
Furnace Blower Fan Wont Turn Off
Furnace Blower Fan Wont Turn Off - Hello Richard, I have a problem with my furnace where the indoor blower will turn off. My furnace seems to be heating okay it is just the blower will not shut off. It is an older furnace, and I have checked the thermostat settings....
Energy Star Gas Furnaces
Energy Star Gas Furnaces | We get this question from time to time about Energy Star gas furnaces and how it can benefit you as a consumer. Therefore we are going to fill you in on the specifics of Energy Star and include information about gas furnaces with the Energy...
Lighting a Pilot that is Electronic Ignition
Lighting a Pilot that is Electronic Ignition - This is one of many questions we get by email. Lighting a Pilot that is Electronic Ignition Comment: Thank you for your interesting discussion of pilot lights vs. electronic ignition. I may have to replace my gas water...
Gas Manifolds | Furnace Components
Gas Manifolds - Furnace gas manifolds connect the valve to the main burners and it is important that the proper pressure be present inside the manifold for proper combustion. Manifold pressure is different from natural gas to liquid propane. Furthermore, this pressure...
Gas Furnace Troubleshooting Flash Codes
Gas Furnace Troubleshooting Flash Codes - In extremely cold weather, there is nothing worse than losing your heating system. Here are some basic tips for checking basic things for the average person, to, hopefully, make a quick fix. A quick fix, so you do not have to...
How to Test a Thermocouple with a MultiMeter
What you will learn from How to Test a Thermocouple with a MultiMeter article: How not to guess if the thermocouple is bad Step by step procedure for testing a thermocouple with a multimeter What reading you should get if the thermocouple is...
Trane Gas Furnace Efficiency Factors & Fuel Purity
Trane Gas Furnace Efficiency Factors - This is a Trane gas furnace. It is also called a Trane 90 plus gas furnace because it offers efficiency levels up to 90 percent plus AFUE (rating). Gas or oil furnaces generally cannot achieve efficiency at 100% because of...
Gas Furnace Heat Exchanger Failure | Heating and Cooling
Gas Furnace Heat Exchanger Failure - Richard, a technician just departed my house after looking at my gas furnace. My mom thought she smelled something so we called the furnace company we usually call when we need furnace maintenance to check it out. He told us our...
How a Gas Furnace Works
How a Gas Furnace Works - Richard, Can you please explain to me in basic terms how a gas furnace works? I have a standing pilot gas furnace if that helps you better. This question is closely related to my article on the Gas Furnace Sequence of Operation. Each type of...
Gas Furnace Troubleshooting Techniques | HVAC Heating Repair
Gas Furnace Troubleshooting Techniques - Electronic ignition for gas furnaces is the modern way for furnaces to light the main burners. Furnace technology has evolved from the standing pilot gas ignition systems. These furnaces continue to be used today, however,...
Two-Stage Gas Furnaces | Heating and Cooling Systems
Two-Stage Gas Furnaces are ever-increasing in popularity among HVAC manufactures of gas furnaces. The product lines are ever-increasing from single-stage gas furnaces to a two-stage gas furnace. The reasoning is that the two-stage gas furnaces are more efficient than...
Dangerous Cracked Heat Exchangers in Furnaces | Heating Safety
Dangerous Cracked Heat Exchangers in Furnaces - Everyone wants heat when old man winter arrives in the fall. Many times we take it for granted. When the temperature falls all we have to do is go to the thermostat and turn the heat on. Usually, this is not a problem....
Trane 90 Plus High-Efficiency Gas Furnace | Heating and Cooling
Trane 90 Plus High-Efficiency Gas Furnace - This is a Trane High-Efficiency gas furnace. It is also called a Trane 90 plus gas furnace because it offers efficiency ratings up to 90 percent plus. Gas or oil furnaces generally cannot achieve efficiency ratings over 95%...
Automatic Vent Damper System | Gas Heat Flue Economizer
Automatic Vent Damper System | Gas Heat Flue Economizer. The automatic vent damper adds efficiency to water heaters and furnaces. The automatic flue damper traps heat in the furnace, boiler, or water heater. It holds heat in and around the heat exchanger instead of...
Gas Furnace Components 3 | HVAC Heating
Gas Furnace Components 3 - Gas furnace ignition controls vary from furnace manufacturer to furnace manufacturer. Some are proprietary and some are from an engineering company that specializes in gas furnace ignition controls. Honeywell being a major manufacturer of...
Furnace Water Leak Condensate Problem
Furnace Water Leak Condensate Problem - Richard, My furnace is leaking water. It is summertime, so I am not using it for heat except for the blower fan which is hooked up to the air conditioner and the heat. I know the pipes from the outside units run into a box on...
Natural Gas Versus Propane | HVAC Heating Fuels
Natural Gas Versus Propane | HVAC Heating Fuels - What is the best for you when choosing between either natural gas or propane? What is your heating system fuel supply? In some cases, you will not have a choice between the two. Having natural gas supplied to your home...
Gas Furnace Hot Surface Ignitor Electronic Ignition Systems
Hot Surface Ignitor - Whenever we talk about electronic ignition systems in gas furnace ignition systems we must first look at the key components which make these systems work and understand how they work. Hot surface ignitor systems work in various ways. This all...
Honeywell Temperature Fan Limit Switch Control
Honeywell Temperature Fan Limit Switch Control - The fan limit control turns the fan on and off in furnace applications. It works off of temperature and also provides a high-temperature safety limit. This is a switch, actually two switches, which turns the furnace...
Standing Pilot Gas Valve Propane Heating | HVAC Heating
Standing Pilot Gas Valve Propane Heating | HVAC Heating - How It Works. The standing pilot gas furnace uses a standing pilot to light the main burners. Many gas-fired water heaters have a standing pilot ignition system. The standing pilot gas ignition system is often...
Gas Furnace AFUE Definition | HVAC Terminology
Gas Furnace AFUE Definition | HVAC Terminology. AFUE or Annual Fuel Utilization Efficiency Heating systems consume approximately 35% to 50% of a typical home's energy budget. Therefore the government has come up with a way to measure efficiency ratings of furnaces so...
Electronic Ignition Gas Furnaces | HVAC Heating
High-Efficiency Electronic Ignition Gas Furnaces are here. They are the next step up from the standing pilot gas furnace. These gas furnaces are more efficient than the standing pilot furnaces but more complex in design. There are three types of electronic ignition...
Gas Furnace Ignition Control Operation | HVAC Heating
Gas Furnace Ignition Control Operation | HVAC Heating. This furnace control board controls much of the functions of this gas furnace with few exceptions. The main control comes from the thermostat and once the thermostat tells the gas furnace control board it is time...
Gas Furnace Components 2 | HVAC Heating
Gas Furnace Components 2 - Gas Burners - Depending on the type of gas furnace and how the gas furnace was engineered will depend on the type of gas burners. Inshot burners generally shoot a flame into the combustion chamber where an induced draft exists. For sealed...
Natural Gas Burners and Burner Tubes
Natural Gas Burners and Burner Tubes - These natural gas burners control the gas as it enters the gas burner tubes. The gas burner tubes have little holes which control the amount of gas that exits the top of the gas burner tubes. The black pipe running out of the gas...
Gas Furnace Maintenance Agreements
Gas Furnace Maintenance Agreements - In the commercial environment maintenance is a never-ending cycle from winter to summer. In contrast, in the residential environment sometimes maintenance is neglected. Neglected until there is a problem with either the heating or...
Gas Furnace Facts
Gas Furnace Facts - Gas Furnaces are the most used types of the heating appliance for our homes and businesses and modern gas furnaces range in efficiency ratings from 79% to 98%. Gas furnaces can either use propane or natural gas for fuel. That largely depends on...
How Gas Furnace Thermocouples Work | HVAC Heating
How Gas Furnace Thermocouples Work | Boilers and Furnaces. Furnaces, water heaters, and boilers, especially older gas systems use the standing pilot gas system as an integral part of the furnace's operation. These systems are best recognized as having a standing flame...
Gas Furnace Components | HVAC Heating Systems
Gas Furnace Components | HVAC Heating Systems. Different types of gas furnaces are available for purchase today and the older models which were installed many years ago still in operation. The older models were typically atmospheric-type gas furnaces and used a lot of...
Flue Condensation Problems
This picture shows furnace flue condensation problems. This problem is caused by hot gases cooling too quickly in the flue. As the hot gasses cool, the moisture in the gases condenses and starts dripping back down the flue. Typically, there is a combustion issue or...
Electronic Ignition Gas Furnaces Types
Electronic Ignition Gas Furnaces Types | Gas Heating Systems. Gas furnaces, boilers, and water heaters have evolved from the basic standing pilot ignition system to the state-of-the-art electronic ignition models. Standing pilot gas furnaces relied on keeping a pilot...
Gas Furnaces Sequence of Operation – HVAC Heating
Gas Furnaces Sequence of Operation - Why is furnace sequence of operation important? If a technician is to properly troubleshoot a gas furnace he needs to know the proper sequence of operation for the particular furnace he is troubleshooting. Gas Furnaces Sequence of...
Gas Furnace Types | HVAC Heating
Gas Furnace Types come in a variety of sizes and can be used for different applications. Types of gas furnaces have different classifications. By and large, the most common gas furnaces use natural gas and utilize electronic ignition. Electronic ignition gas furnaces...
Electronic Ignition Gas Furnace Problems Troubleshooting
Electronic Ignition Gas Furnace Problems Troubleshooting - Gas furnaces are a prevalent form of heat for homes and businesses, and occasionally a gas furnace needs to be repaired because of a problem with the gas furnace. Since there are many different types of gas...
Changing a Standing Pilot Boiler to Electronic Ignition – Conversion Upgrade
Changing a Standing Pilot Boiler to Electronic Ignition - Conversion Upgrade - How many times have you spent time in the cold trying to light a pilot light on a standing pilot gas system? I am certain if you are a service technician, then the previous sentence can be...
Natural Gas Properties and Furnace Heating Efficiency
Natural Gas Properties and Furnace Heating Efficiency - Natural Gas is a popular fuel used for heating systems in America and other countries. If we look at the properties of natural gas and the heating efficiency of natural gas furnaces we will see that natural gas...
Honeywell Gas Furnace Ignition Control Modules | HVAC Heating
Honeywell Gas Furnace Ignition Control Modules | HVAC Heating. There are many different types of gas furnace ignition control modules that control a gas furnace or gas boiler. These solid-state control modules can easily be retrofitted to replace other control...
Gas Furnace Troubleshooting and Repair – HVAC Heating
What you will learn from Gas Furnace Troubleshooting and Repair : Where to begin your troubleshooting efforts Checking the basics Checking the blower motor Additional furnace component checks for problems Lots of valuable related links to give you a...
Gas Oil Vent Flue Vents Materials Table | HVAC Heating
Gas Oil Vent Flue Vents Materials Table - Gas and oil vent flue piping uses different types of materials depending on the applications. It is important that gas or oil flue vent pipes are installed correctly and maintained throughout the life of the furnace This pipe...
How To Light a Pilot Light – HVAC Heating
How To Light a Pilot Light...
Gas Furnace is Making Too Much Noise | Diagnosis and Repair
Gas Furnace is Making Too Much Noise - Richard, my gas furnace makes a lot of noise when it is running and it is somewhat annoying and sometimes bothers me when I am sleeping. It is installed in a closet close to my bedroom. What can I do to fix this gas furnace that...
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