Miller furnace troubleshooting. Furnaces of all kinds, including those manufactured by Miller, have a variety of features and benefits that other models do not.
The most popular is the “millivolt ignition system,” which keeps your home safe from outages and automatically shuts down if an outage occurs at any time during operation.
Furnaces will also contain a number of different system components which could be tweaked or tampered with by inquisitive children or pets.
Over time, these units can tend to run at lower temperatures than normal yet still use high levels of gas consumption.
If you are having problems getting your furnace running properly, here are some starter troubleshooting steps you can go through before calling a specialist.
Miller furnace troubleshooting
Here we will discuss some common issues and solutions for Miller furnace troubleshooting.
Furnace is noisy
The blower wheel is a key component of your furnace as it blows out hot air through the furnace and then into your home.
It is important to check the blower wheel regularly to ensure that it is not in any way damaged, as this may end up affecting how hot the air blows out of the vents.
Over time, due to friction and general wear and tear on the motor bearings, a furnace blower begins to make a lot of noise.
In some cases it’s possible for the bearings to be lubricated, simply remove the back panel from your furnace, carefully disassemble it, and apply some light gear oil.
If this works then great, otherwise, you may have to replace the motor which is what most people end up having to do, unfortunately.
The motor helps expel hot air through the exhaust flue to prevent heat from warping the shingles. If it’s not working properly, this may be due to a faulty motor.
Start Then Stop Immediately
The flame sensor detects a flame from the burners in your furnace. If this part fails to detect fire, it will prevent gas from reaching the burners, preventing them from igniting.
If the flame sensors are dirty, they might not perceive fire when it is burning. Clean the burner and part of the sensor that’s out of reach with a fine abrasive pad.
If you still experience problems with ignition, replace the parts until your furnace works again properly.
The control board is the furnace’s brain. It regulates the power supply to all of the components attached to it and is also responsible for sending power to the ignition system, which in turn keeps the burners on.
If this control board malfunctions or otherwise has issues, then there is a chance that not enough voltage will be supplied to keep the burners going.
Blower not running
The blower motor blows air through the return vent, past the heat exchanger, and into the home’s circulation. First, make sure that power is getting to the motor.
If power is getting to the blower motor and it’s running, but the air isn’t being blown through the vents in your home, then your furnace filter needs to be cleaned or replaced.
If your furnace fan is spinning freely but isn’t pushing air through a dirty filter into your heating system via ductwork and vents, then you will need to clean or change out your furnace filter as well.
If the capacitor is defective, it can lead to several different problems with the fan motor. These include the fan running too slowly, being an odd color or being unusually warm to the touch – or the fan not turning on at all.
Issue In Heating
The igniter is a piece of equipment that lights a gas burner. If there’s any sort of fault in the igniter, such as cracks, it may cause the furnace to not light up.
To identify if the igniter is faulty, all you have to do is remove it from its original location and check for any kind of damage. In case the igniter does get damaged or cracked, repair or dispose of it.
If your furnace is not heating, you may need to repair or replace the flame sensor on the furnace’s control board. To access the flame sensor, remove the burner grates and open the side panel of your furnace.
If there is a front panel covering that area of your furnace, also remove it before removing the burner grate.
The flame sensor is located behind the center of the heat shield between the burners. Remove any screws securing it and inspect its wires for damage.
Blower runs continuously
The furnace control board has relays that help ensure a steady voltage throughout the machine to prevent sudden surges that can damage components.
If a relay breaks while it is switched on, it will send on the continuous flow of current, causing the motor that connects to it to keep running continuously.
The wall thermostat may not be functioning properly if the blower motor is running continuously. To determine if the wall thermostat is defective, test it using a Multimeter.
If the Multimeter displays that there is continuity between the (R) and (G) terminals when testing a position in which the thermostat should be off, it indicates that a separate problem exists with the electrical wiring to the blower motor or its control circuitry.
Stops After Few Seconds
The flame sensor is a thermistor that detects the presence of an ignition flame in order to start up the main burner(s) of your furnace.
Since this part needs to detect a distinct difference in temperature at close proximity, it’s important that you clean it off with a not too harsh form of cleaning once in a while to keep it/them working safely per manufacturer instructions.
The control board is responsible for sending electricity to all the other little boards of your furnace.
If it’s not working properly, it might accidentally send too much or too little voltage to the ignition system and it will shut off after a few minutes.