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A thermocouple is typically found in older furnaces, whereas new installations are now required to use electronic ignition furnaces, which use less energy since there is no pilot that burns gas constantly. If no flame is present, the sensor stops or prevents the flow of gas from the gas valve, thus preventing the dangerous situation of gas flowing into the appliance when there is no flame to burn it. Flame sensors and thermocouples are simple parts that wear out and fail over time, and most are easy to replace. If the furnace has been running, wait at least 30 minutes for the flame sensor to cool completely. Confirm that the flame sensor is removable—if so, it should be fastened to the burner assembly with one or more screws. If the sensor is integral to the gas ignition system, you'll need to call a professional furnace technician to make the repair.
Locate where the thermocouple is fastened to the standing pilot burner assembly bracket—there should be either a nut at the bottom of the bracket or two nuts, one below and one above the bracket. 96% AFUE MG2S & MG3S Gas FurnacesThe most efficient two-stage gas furnaces specifically engineered for use in manufactured homes. Like a thermocouple, the flame sensor has a metal probe and bracket, but it has no gas tube. Instead of a wire lead, it usually has a quick-disconnect wire fitting.
Thermocouple
His home repair articles for The Spruce span more than 10 years. To turn off the gas to the furnace, use the valve handle located on the gas pipe running into the furnace. When the handle is perpendicular to the pipe, rather than parallel, the gas is off. It may be easy to pull out the single burner that holds the pilot assembly. In many cases, it is easy to pull out the single burner that holds the pilot assembly.
Connect the new thermocouple to the pilot burner assembly bracket, tightening the nut until it's just snug. If the furnace has been running, wait at least 30 minutes for the thermocouple to cool completely before continuing. Bob Formisano is a licensed architect and builder with nearly 40 years of experience building new homes and restoring older homes. One of his specialties is repairing old systems dating back to the 1920s, including galvanized water pipes, knob-and-tube wiring, and more.
Roof & Plumbing
He specializes in estimating as well as design and engineering for plumbing systems, and he works for one of New York's largest union plumbing construction companies. All units and each component are tested on the manufacturing line to ensure quality. Insulated cabinet ensures minimized heat loss and quiet operation. For nearly 20 years MobileHomeRepair.com has been the leading resource for mobile home repairs, upgrades, maintenance, and enjoyment. Our commitment is to you, the homeowner, repair professional, or friend lending a helping hand.
We offer the full line of Revolv furnaces including the mobile home gas and electric furnace models. Our mobile home gas furnace is offered in both 80% and 95% efficiencies. Choice of air conditioning-ready furnaces allows easy hook up of a matching cooling system to further improve your year-round comfort and efficiency. Install the new flame sensor in the same position as the old part and secure it with the screws. Reconnect the electrical leads to the sensor and to the control box. Test the furnace to make sure it turns on and off properly.
Fittings & Valves
A bad thermocouple will generally show signs of damage on the tube, the wire, or the connecting nuts. If the thermocouple is bad, the furnace usually refuses to ignite . Today, you'll find gas furnaces in more manufactured homes than ever before. Electronic flame sensors are much less universal, and you must find the exact part specified for your furnace model. Shop online through appliance parts dealers and compare their prices to those at local distributors. If you need a part in a hurry, find a local dealer who has the part in stock.
Continuous fan switch circulates room air continuously during summer or winter operation to improve comfort. Make sure the gas valve knob is turned to the off setting. Thread the end fitting of the thermocouple into the gas control valve and tighten it by hand.
When purchasing a replacement thermocouple or flame sensor, it's essential to make sure that it's compatible with your particular furnace model. Honeywell, White Rodgers, and other manufacturers make universal replacement thermocouples, usually with a 30-millivolts rating for standing-pilot furnaces. Replacement Coleman 24" thermocouple senses pilot light and closes gas valve if no flame sensed. Used in most all furnaces with a pilot light. Turn on the pilot light and make sure about 1/2-inch of the thermocouple extends into the pilot flame. Replace the furnace access cover and test the furnace operation by changing the thermostat settings to make sure the furnace turns on and off properly. Using an open-end wrench, unscrew the nut that holds the thermocouple end fitting into the gas control valve.
Choose from Rheem and Goodman packaged mobile home air conditioning systems or heat pumps. A package unit is self contained in one easy-to-install outdoor unit. These mobile home air conditioning units are available as cooling only, or choose either electric heat or a heat pump for the most complete selection available in mobile home heating and cooling systems.
Right out of the box, but you can extend this coverage by registering your products. Intertherm oil furnaces are one of the most installed oil furnaces because of our amazing features. High-efficiency operation meets all federal energy efficiency standards. The Spruce uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Richard Epstein is a licensed master plumber with over 40 years experience in residential and commercial plumbing.
Then, use the open-end wrench to tighten it about a quarter-turn more; again, do not overtighten. Before getting started, turn off the electrical power to the furnace by rotating the toggle switch mounted on the furnace to the off position. This switch is usually mounted on the furnace housing, but it may also be located on the wall near the furnace. Furnaces already installed in a new manufactured home are not eligible for registration. There is no need to register these furnaces as they receive the automatic warranty of 1-year parts and 1-year flat rate labor. Remember, most of our products enjoy a 1-year warranty right out of the box, but you can extend this coverage by registering your product.
The most common symptom of a bad flame sensor is a furnace that cycles on and off repeatedly every few seconds. A bad flame sensor may show visible signs of damage, such as a cracked ceramic insulator. A thermocouple consists of a metal gas tube , a probe that extends into the pilot flame, a bracket, and a wire that leads to the gas control unit.
Flame sensors are used in furnaces that use electronic ignition rather than a standing pilot light. These furnaces can use anintermittent pilotthat ignites only when needed, or they can use a hot surface ignition system that uses heat to ignite the gas. These units have electronic igniters that light the gas, with a flame sensor that makes sure the burners have lit successfully. If there's a problem with ignition and the burners fail to light or go out, the flame sensor is designed to shut off the gas to the burners. The top of the thermocouple is positioned in the flame, keeping the tip heated at all times. If the pilot flame goes out, the tip cools and the thermocouple automatically shuts off the furnace's gas valve.
Install the New Thermocouple
Remove the flame sensor by loosening the fastening screws with a nut driver or wrench. Straighten the lead on the new thermocouple, and shape it to resemble the old thermocouple. This doesn't have to be precise—it just helps to start with a similar shape.
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