Keep an eye on the manometer, since its display will change as you adjust the valve. Then open the furnace’s access panels (there are usually two). If you have a Lennox furnace, here’s a troubleshooting guide, for example. Look at the filter. Check to make sure your gas supply is in the on … I found a real good YouTube video made by ACServicetech which explains how to troubleshoot Honeywell Smart Valve gas valves below. Each manufacturer will have its own. Testing a gas valve. They can assess any issues and then repair your furnace so your home can be cozy again. When I tested the voltage with my multimeter, I got 24 volts going to the gas valve at PV after the prepurge cycle of the ventor motor and when the igniter started sparking. Christopher Solomon, Bob Vila, make sure the furnace is running efficiently, 12 Indoor Gardening Mistakes Youâll Wish You Knew Sooner, Solve Common Furnace Problems with 9 Easy Fixes, Prevent a Crisis: This Fall, Give Your Furnace a Tune-Up, What's the Difference? Could you have blown a fuse? Referring to the furnace’s manual for its location, see if your pilot light is on. A whistling sound is an indication of a problem. Troubleshooting a gas valve on a furnace? A gas valve failure in a residential furnace or a roof top unit will prevent the unit from operating. Here’s the next step in furnace troubleshooting: Go to your home’s breaker panel and look for the circuit that controls the furnace. Often this switch is unlabeled. So the first step in troubleshooting your furnace is to double-check that the thermostat is set correctly. A dirty, clogged filter limits the airflow, eventually causing heat and pressure to build up in the furnace. We have had many people ask us about how to troubleshoot Honeywell Smart Valves. Another way to double-check: If you have more than one gas appliance, find out if it’s working. If you have already scheduled routine maintenance yet your furnace seems to be malfunctioning — e.g., blowing cold air or perhaps blowing no air at all — you might try these furnace troubleshooting tips. The flame is sensed by a flame rod on the opposite side of the burners as the yellow glow. Furnace Clicking, But Not Turning On – Gas Supply. Let’s focus on the gas valve, because it’s an important part of a furnace. In the meantime, try this quick review yourself: Confirm that your thermostat is set on “heat” and the temperature is positioned where you want it. If you smell gas, contact an HVAC professional immediately to handle any natural gas leaks, as they can be dangerous. What do you do? Get free, no-commitment repair estimates from licensed HVAC technicians near you. “You’re looking for the one switch that seems in a different position from all the others,” Bonner says. The Furnace Won’t Stay On If the furnace fires up but then shuts off after a few minutes, it could be that the control board is faulty. Adds Bonner: “If your furnace is located in a laundry room, I would definitely service it every year, because we have chlorine and phosphates and all sorts of odd chemicals in the laundry room. It’s controlled by the circuit board. 0 = Reversing valve Troubleshooting A Furnace Thermostat ... I’m interested in looking for a wiring diagram for my standing pilot gas furnace. Ensure the power works through the switch, breaker, fuse and indicator light. You’re dealing with fire, however, so don’t do anything you’re not comfortable with. If failure occurs during a running cycle, the pressure switch contacts will open and the gas valve will close to shut the unit down. ... Time Delay Relay: The time delay relay uses a small delay before initiating the furnace cycle. With an oil furnace, check the fuel supply. It can be located either on the unit or—because electricians often work before the furnace is installed—on a wall nearby. In case the valve isn’t working, I check two major parts before considering replacing it. If the thermocouple doesn't shut the gas off, all the gas that flows through the furnace might get into your house. “It’s a good thing to do, with such a high-dollar item in your house.” For about $100 or so, a technician will eyeball the system, oil the motors, run a safety check, and clean the flame rod on the newer furnaces to make sure the flame is there. If installed correctly, the switch in the up position is “On.” Unfortunately, this switch can sometimes be mistaken for a light switch and accidentally turned off. Faulty Pilot Light or Furnace Flame: If your pilot light keeps going out, contact a professional, as the ignition switch may be installed incorrectly. If all else fails, check the furnace’s gas valve to make sure that it hasn’t somehow been turned to the “Off ” position. It recently stopped working and I’m … A gas valve is used to apply the gas pressure that the furnace is receiving, as well as to provide certain safety features. The furnace gas valve opens and closes, which allows the flow of gas … By Christopher Solomon and Bob Vila. Furnaces have another switch, simply known as the “furnace switch.” It’s a power switch that often looks like a regular light switch. Ongoing clicking when the furnace isn’t working may be a sign that gas isn’t reaching the pilot light. If a heat exchanger breaks, carbon monoxide could leak into a home, Bonner points out. Newer, more efficient furnaces are sensitive to the problem and will often shut down before a dirty filter causes more trouble. On modern electronic ignition gas furnaces, there are fault codes that can flash on an electronic module or a circuit board located inside the gas furnace. The gas valve opens for 4 to 7 seconds to allow gas to pass into the burners. Sometimes those that use batteries will flash a low-battery symbol when they need a replacement, but the signal often goes unnoticed, says Bonner. To test a Suburban gas valve, you are going to have to pull the working parts of the furnace out of its case. This Lennox gas furnace troubleshooting guide will help you know what to do when your furnace won't start or won't perform as it should. “Many thermostats have to be physically set to “Heat,” Difulgentiz says. Thermocouple defends against a disastrous gas accumulation. ), Some electricians do a poor job of labeling—or correctly labeling—appliances in the house. Any gas furnace has a “gas cock” that has to be located within six feet of the furnace, Bonner says. Start Right Here Find appliance parts, lawn & garden equipment parts, heating & cooling parts and more from the top brands in the industry here. This is probably because the gas valve closed to slowly or some other reason that caused the burner flame to stay lit longer than it should. Check your owner’s manual for the exact location. According to the NY Times Annual Home Maintenance Checklist, an HVAC professional should check your house’s ductwork and clean your furnace on a bi-annual basis to keep everything running smoothly. How do you know if this is your furnace’s problem? If you are having furnace problems, plenty of furnace troubleshooting tips exist. Natural gas or propane problems: When you suspect problems with the gas feed or valve because of a malfunction with the gas pressure regulator, call a professional for help. Here are some of the things that you should keep in mind with Goodman furnace troubleshooting issues: Examine the settings on the thermostat. 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