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McQuay Furnace Troubleshooting
If you're looking for help fixing your McQuay Furnace, look no further! Our comprehensive McQuay Furnace Troubleshooting guide will explain common issues, provide tips, and show you how to read your model's error codes.
Furnace not heating
The igniter gets very hot and glows bright orange to light the gas burner. If the igniter fails or cracks, the furnace won’t heat. To determine if the igniter is faulty, remove the igniter and inspect it for cracks. If the igniter is cracked, replace it. If the igniter is not cracked, use a multimeter to test the igniter for continuity. If the igniter does not have continuity, replace it.
The flame sensor monitors the burner to detect whether or not a flame is present. If the flame sensor is defective, it might fail to detect a flame. If the flame sensor does not detect a flame, the control board will shut off voltage to the gas valve to prevent the furnace from heating. Sometimes, if the flame sensor is dirty, it will fail to detect a flame. Try cleaning the flame sensor with a fine abrasive pad. If the furnace still doesn’t heat, replace the flame sensor.
Draft Inducer Motor
The draft inducer motor draws air into the heat exchanger and then exhausts it out the flue. The pressure switch senses a pressure change and closes a switch to signal the control board that the furnace has proper air flow. If the draft inducer motor is defective, it may be unable to close the pressure switch, causing the ignition process to stall and the furnace to shut off after a few minutes. If the ignition process stalls, the furnace will shut off. If the draft inducer motor is at fault, replace it.
The control board regulates the power supply to all of the components of the furnace. If the control board fails, it might not send voltage to the ignition system, causing the furnace not to heat.
Flame Rollout Limit Switch
The flame rollout switch monitors the heat surrounding the burners. If the inducer fan motor cannot draw enough air through the burners, or if the furnace is not venting properly, the rollout switch will open to halt the ignition sequence and prevent the furnace from heating. To determine if the flame rollout switch is defective, use a multimeter to test it for continuity. If the switch does not have continuity and the reset button is not tripped replace it. Be aware that poor airflow through the burner is often a result of insufficient ventilation or a restricted exhaust vent. Make sure that your furnace is in a properly ventilated location and the exhaust vent is clear of obstructions.
The wall thermostat has electrical contacts that control the power supply to the furnace. If the contacts in the thermostat fail, the furnace will not turn on. To determine if the thermostat is defective, use a multimeter to test it for continuity. If the wall thermostat does not have continuity, replace it.
Gas Valve Assembly
The gas valve opens to allow gas to flow into the burner. If the gas valve is defective, the valve will not open, preventing the furnace from heating. To determine if the gas valve is at fault, use a multimeter to test it for continuity. If the gas valve does not have continuity, replace it.
The pressure switch closes when the burner has sufficient airflow. If the pressure switch isn’t working, it might not close when the proper airflow is present, causing the ignition process to stall. To determine if the pressure switch is defective, use a multimeter to test the switch for continuity. If the pressure switch does not have continuity, replace it.
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I have had a Daikin furnace for four years now. I’ve always taken care of the furnace by having it checked and maintained annually. I also replace the filters after every eight weeks. The furnace has never failed and is always reliable even at the worst weather. My current technician tells me that the installers did a good job. The noise level is barely noticeable. I would recommend the Daikins Furnace to everyone.
My husband and I moved into our new home 2 years ago, but as soon as we settled, the furnace broke. We called a technician who advised that we should purchase a new furnace since the old one would continue giving us problems. He suggested that we go for Daikin and it has been a perfect choice. Sometimes, the warmth in the house is the only indication that it’s on. It keeps our home cozy and warm in just a short time even in the cold Wisconsin winters. We have not had any problems with the Daikin furnace so far. I would gladly buy it over and over again.
I recently purchased the Daikin Furnace and fell in love with it. It has cost me nothing more than the eighty dollars I pay for the annual checkup. It has cut my gas bills by over 50%. I don’t even turn off the furnace during winter. I know that the furnace is great and I guess that the problems people are experiencing are due to poor maintenance. I would recommend Daikin to everyone out there.
The Daikin furnace that I replaced had served our family efficiently for twenty five years until it broke down three years ago. I immediately replaced it with a newer model of Daikin. As always, it has low maintenance needs; all that is required is for me to change the filters at least three times a year. I have never had to repair the Daikin, but it still runs smoothly. If I were to make a furnace purchase again, I would still purchase this unit.
McQuay International, also known as Daikin Applied in the United States, offers air conditioning, heating, ventilating and refrigeration units. McQuay International is headquartered in Hong Kong, with U.S. headquarters in Minneapolis, MN. The company is owned by Daikin, a fortune 1000 company. Daikin reported revenue of approximately $18.4 billion USD in 2017.