If you're looking for help fixing your Daikin Furnace, look no further! Our comprehensive Daikin Furnace repair guide will explain common issues, provide tips, and maybe show you how to repair your appliance.

Daikin manufactures appliances that homeowners have come to trust. Even a trustworthy appliance requires occasional maintenance or repair, however. If you’re in need of Daikin appliance repair from experienced professionals, your local Appliance Helper can help.

The Furnace Won’t Start 
If nothing happens when the thermostat is set above the home’s current temperature, the most likely causes are these: 
The furnace switch (located on or near the furnace, looks like a common light switch) is turned off and simply needs to be turned on, though the furnace might have a short delay before starting 
The circuit breaker is off, and if the circuit continues to trip after it is turned back on, there is likely a wiring short in the furnace 
The thermostat isn’t set to “heat,” which is easy to check and remedy 
The thermostat isn’t working, and this is sometimes caused by a wire coming loose, so check the wiring connections 
The thermostat needs fresh batteries, if battery-powered, or it is bad and must be replaced, an issue that can be diagnosed using an electrical multimeter that shows if a circuit is complete 
The filter is dirty and must be replaced or cleaned, an issue that is especially true on newer furnaces that are equipped to shut down if the filter isn’t allowing adequate air flow, a condition that can cause serious mechanical failure 
The furnace’s main circuit board/control board is bad, an issue that can be diagnosed by an HVAC technician is nothing else solves the issue 

Furnace Blowing Cold Air 
If the furnace won’t produce heat, you can check to see if it is getting power by moving the fan switch from the “Auto” position to the “On” position. If the fan comes on, then the furnace is getting power. The likely issues then are: 
The gas is turned off, so check the gas cock near the furnace to make sure it is parallel to the gas line, its position when the 
The gas control valve isn’t opening and must be replaced 
The ignitor is failing and must be replaced 
The draft motor isn’t functioning or the fresh-air intake is blocked, perhaps by snow or debris, and needs to be cleared 

The Draft Motor Runs, Furnace Won’t Start 
The draft motor is also called the inducer motor. It pulls hot combustion gases through the furnace and out the exhaust stack. If it starts and then the furnace shuts down, the cause might be: 
The motor or the board that controls it has failed and must be replaced 
A blocked air intake or blocked exhaust chimney (snow, debris and bird’s nests are common causes) must be cleared 
One of the issues discussed above with gas, gas valve and ignitor must be addressed 

The Flame Starts, but the Furnace Shuts Down 
If the burner starts making heat but soon shuts off without warming your home, the flame sensor isn’t working. If the sensor has corrosion on it, sanding it might work, though replacing it is a longer-lasting fix. 

The Blower Won’t Shut Off 
If the blower motor runs all the time, there are three common issues: 
The fan switch on the thermostat is set to “on” rather than “auto” 
Relays in the control board are stuck in the closed position, so the blower is getting a constant supply of electricity, and the control board must be replaced 
The thermostat also has contacts that control power to the furnace, and they can be worn, so the thermostat must be replaced. 

Why Does the Furnace Keep Shutting Off 
If your furnace burner lights but the furnace soon shuts off, there are a few common issues that might cause this: 
The furnace filter is dirty and should be cleaned or replaced 
The flame sensor isn’t working and should be replaced 
The thermostat is failing 
While these are common, there are several other potential causes best diagnosed by a furnace technician. This video gives in-depth coverage to the problem of furnace short-cycling. 

The Furnace Runs but Can’t Keep the House Warm 
If your furnace is properly sized for your home, then it should keep your home warm even in extreme cold. If it runs constantly but isn’t providing enough heat, the likely causes are: 
A dirty filter that must be washed (only if the washable type) or replaced 
The filter is the wrong type for your furnace and restricts airflow, so should be replaced 
The filter is installed backwards, an issue that can be checked by looking for the arrows on the filter frame that show proper installation direction with the flow of air 

The Furnace Makes Loud Noises 
A noisy furnace is most often the result of: 
The furnace being a single-stage model that runs on high capacity all the time, so it’s going to be loud 
A bad bearing in the draft motor or the blower motor that must be replaced 
A leak in the furnace cabinet, sheet metal plenum or ductwork near the furnace that must be tightened 
A dirty filter, which can also cause whistling 

The Air Coming from the Furnace Smells Bad 
Foul odors from the furnace are usually caused by: 
A very dirty filter that should be washed, if washable, or replaced 
A dead rodent or bird somewhere in the system, usually a job for a professional furnace technician 

The CO Monitor Going Off 
A carbon monoxide alarm should be taken seriously. Turn the furnace off at the thermostat. Don’t go into the room where the furnace is located. Open doors and windows, and go outside. Call 911 from a cell phone outside your home.

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