Before You Call The Repairman - Check These FirstIt sounds unbelievable, but 20-30% of calls to the repairman are due to very simple and overlooked things that you should check first before calling
'RESET' near the motor housing, wait 30 minutes to let the motor cool, then turn the power off to the furnace
technician
3) Is your door cover on correctly?
If it is not on just perfect, your furnace will not start. This happens commonly after a filter change.
4) Are too many registers closed?
Do not close off more than 20 % of the registers because this can cause high resistance and unnecessary heat build up in the furnace.
It's OK to close some registers to save on energy costs if rooms are unused...but do not exceed 20%. So if you have 10 rooms, you should only be
It may have been turned off by mistake.
How Do I Turn On My Gas Furnace?
It sounds easy, but believe it or not, many people don't know how to turn their furnace on or off. Here's a simple, step-by-step breakdown:
* Find the breaker for your furnace. It's part of the electrical panel, which is usually located in your basement, utility room or garage. The breaker
* Locate and turn on the furnace switch. It is typically somewhere near the bottom of your basement stairs - sometimes in the ceiling, sometimes in
6) Look for blown fuses or tripped circuit breakers at the main entrance panel.
Some furnaces have a separate power entrance, usually located at a different panel near the main entrance panel. Some furnaces have fuses
7) Check to make sure the thermostat selector switch is on 'Heat'
If necessary, raise (or, for an air conditioner, lower) the setting 5º.
By setting the temperature higher than the actual room temperature, this will kick start your gas furnace to turn on and will begin to warm your room.
8) If the unit uses gas, check to make sure the gas supply is turned on and the pilot light is lit.
9) Is the furnace venting blocked by snow or ice?
If so, try to remove the blockage.
10) Are the programmable thermostat batteries fresh?
11) Is your blower fan on?
Not all furnaces have a blower on/off button, but if your does, check it just in case your dog or child accidentally bumped into it.
Additional Troublshooting: relight a standing pilot & electronic ignitions
If A Gas Smell Is Detected
Gas furnaces and heaters have control shutoffs to prevent gas leaks, but they are not fail-safe. If you smell something like a rotten egg smell, you
leaving the door open, and immediately call the gas company or the fire department to report a leak IMMEDIATELY. Do not re-enter your home.
TROUBLESHOOTING
My Gas Furnace Produces No Heat
• Replace blown fuse
• Relight pilot light
• Replace the thermostat
My Gas Furnace Does Not Produce Enough Heat
• Replace dirty air filter
My Gas Furnace Comes On And Off Too Frequently
• Adjust the thermostat heat anticipator
• Troubleshooting a Thermostat
• Replace dirty air filter
How to inspect, repair or replace the Blower Fan Belt on a furnace:
Regularly inspect blower-fan belts for any sign of damage and replace the belt if it’s damaged. Knowing how to inspect the blower-fan belt improves
squealing noise that may drive you crazy and, more important, costs you money. If the belt isn’t tight enough, it slips, and the fan will not turn as it
you're buying a new blower-fan belt, buy two. Keep the extra one in a plastic bag on a nail by the furnace for those middle-of-the-night, all-the-stores-
using the motor adjusting bolt or you can also tighten the belt by loosening the attachment bracket. Then, move the motor assembly so the belt
check the pulley alignment too. The pulleys should line up perfectly. If you
My Blower Does Not Turn Off - It's Always Running
Run the fan to check for running time. Fans set at too high a speed wastes energy. If the fan shuts off too soon or comes on too early, much of the
rooms further away from the furnace are working properly. Otherwise, you'll end up with some rooms that are too hot and others that are too cold.
My Gas Furnace Is Noisy
Coming Soon
•Adjust pilot light
How to inspect, repair or replace the Blower-Fan Belt on a furnace:
Regularly inspect blower-fan belts for any sign of damage and replace the belt if it’s damaged. Knowing how to inspect the blower-fan belt improves
squealing noise that may drive you crazy and, more important, costs you money. If the belt isn’t tight enough, it slips, and the fan will not turn as it
you're buying a new blower-fan belt, buy two. Keep the extra one in a plastic bag on a nail by the furnace for those middle-of-the-night, all-the-stores-
using the motor adjusting bolt or you can also tighten the belt by loosening the attachment bracket. Then, move the motor assembly so the belt
check the pulley alignment too. The pulleys should line up perfectly. If you
Re-Lighting A Gas Furnace Pilot
Coming Soon
The burner in your gas furnace is ignited either by electronic ignition (as found in most modern furnaces) or with a pilot flame (common in older style
is to serve as a small ignition flame for the gas burner. And when this little flame fails to operate properly or go out, it's one of the most common
troubleshoot the furnace
or replace the thermocouple.
How to re-light the older style gas standing pilot.
My Furnace Comes On For 7 To 10 Seconds, Then Turns Off
OR
Furnace Burner Will Not Ignite
Possible Causes:
Electronic Ignition Furnace Problems
The more modern gas furnaces don't have hand-lit burners anymore; instead they have what is called a hot surface ignitor that gets red hot when
nitride kind do last a couple years longer.
Visit: Repair and troubleshooting of the Electronic Ignition Furnace
Replacing The Ignitor:
STEP 1
Turn off the power to your furnace at the electrical breaker box.
STEP 2
Take off the front panels of your furnace. To get to the hot surface ignitor, you have to take off the top panel first. In
STEP 3
Now, remove the bottom panel that covers the motor and the hot surface ignitor. It also holds the gas
IF YOU SMELL GAS AROUND YOUR
STEP 4
Locate the hot surface ignitor. It is close to what looks like a back wall inside the furnace; you can see the
bracket.
STEP 7
Using the proper tool for the job, which in this case is a 1/4 inch socket, remove the screw and pull out the
shop online (this will save you tons of money!) You can go online
easy
chart can also assist you in proper selection. You can also contact a supplier with the Model # of your
furnace. NEVER TOUCH THIS!! When you get your replacement part, use gloves if you have to, but DO
will blow up again in just a few days after installation. I can't emphasize this enough.
STEP 10
Insert the hot surface ignitor, put the screw back in and gently tighten. Plug in the plastic end to the
to start it up again. (I turn my thermostat all the way down, turn the gas valve on, turn the breaker switch
Am I Mismatching The Furnace And Thermostat:
To find the right type of thermostat (Millivoltage, Low Voltage or Line Voltage) for your furnace, click here: Matching yourThermostat and Furnace
My Furnace Is Fine, But There Is No Heat, Wild Temperature Swings Or Cycling
Possible Solution:
Replace A Faulty Thermostat
Replace A Faullty Thermostat
Do You Have A Particular Room In The House Cold?
Possible Solution:
Test Your Furnace's Airflow
If a room in your house is too cold during the winter, it might be because your furnace isn't supplying enough warm air through the registers in that
measurement, it is better than no measurement at all and will give you a good ideas as to whether you need to call a technician to look at your
determine why the heat is not going through.
The garbage bag airflow test is also useful if you have changed your heating or cooling systems or have made major renovations to your house.
PROBLEM: Fan Motor Has Seized
Possible Solution:
How to Properly Remove Vent Blockages
If you become aware of a furnace problem that might involve the exterior vent, do a quick inspection and see if any snow, ice or some common
you can safely clear away whatever is blocking your exterior vent. Once you're done, turn your furnace back on using either the breaker or the
Inspect Your Pipes
Examine the ends of pipes. Blockage of your pipes can cause your gas furnace to not work properly. Look for wears and tears in the pipes. They
DO NOT disconnect any pipes that lead to the gas supply.
If you remove any piping that leads to the gas line, you can cause a gas leak, and that is very dangerous.
Call a professional if these troubleshooting techniques didn't work.
ADDITIONAL VIDEOS
How To Operate A Gas Furnace
How To Change A Furnace Fuse
Common Furnace Problems
How To Troubleshoot A Heating System
HVAC Troubleshooting
How To Balance HVAC Air Flow
RELATED LINKS
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