Since 1928, Armstrong Air has been the smart choice for homeowners who expect more from their heating and cooling system. Built with durable materials and incorporating brilliant technology throughout, Armstrong Air is not only the brand to trust with your home comfort, it’s also the brand more dealers would choose for themselves. From gas, oil and electric furnaces to air conditioners, heat pumps, air handlers and indoor air quality equipment, when you trust Armstrong Air, you’re trusting The Professional’s Choice.

Air Conditioner Troubleshooting

My home is not getting cool air 
A circuit breaker may have been tripped in your home 
Locate your circuit breaker box (or electrical panel). They are typically located on an inside wall at the back of the house. Check the circuit breaker box and make sure breakers are in the ON position. Also check that the disconnect switch (located near the air conditioner or heat pump) is ON. You may need to reset your circuit breaker. 
Incorrect setting on your thermostat or your thermostat may simply be OFF 
Check that your thermostat is ON and set to COOL. 
Blocked filter 
Check the furnace or air handler filter to see if it is blocked with dust and dirt. If so, change the filter. Remember to change your filter approximately once a month. 
 
There is no airflow 
Blocked filter 
Check all the filters in your HVAC system components. Follow the recommendations in your user’s manual for cleaning and replacing your filters. 
Dirty coil may have frozen your system 
Check your indoor unit and see if there is evidence of water below the unit. Feel for a cold surface on the indoor coil enclosure. You can turn OFF your thermostat for 1–3 hours to see if it will defrost. Contact a certified repair person if the problem persists. 
Dirty or blocked ductwork 
Check your indoor unit to see (or hear) if the blower is running. Then go to different vents in your house to feel for airflow. If you do not feel any air, contact a certified repair person for duct cleaning services. 
 
The drain pan is overflowing 
The overflow switch is likely not functioning 
Turn your system OFF and contact a certified repair person. 
 
My unit runs all the time 
Your thermostat setting might be too high or low 
Adjust your thermostat during extremely hot or cold days so that your heating and cooling system doesn’t have to work so hard. 
 
My utility bills are higher than normal 
Your system is not reaching its thermostat setting 
If your outdoor temperatures are constantly in the extreme, you may experience higher-than-average utility bills as your system tries to keep up with extremely hot or cold weather conditions. 
Your utility company may have had a recent rate increase 
Check with your local utility company to ask about recent rate increases. Ask them about ways to conserve energy with your existing equipment. It may be time to think about upgrading your equipment for greater energy efficiency. 
Are you using a new appliance that uses a lot of power (hot tub, pool heater, sauna, etc.)? 
You may consider turning the appliance ON for shorter periods of time or completely OFF when not in use.

Furnace Troubleshooting

Not heating?  
Most likely, either the electrical system providing your furnace’s power has shorted or the power switch has blown. Try resetting your furnace’s circuit breaker. If it has blown, you will need to replace it. 
The furnace’s igniter might either be cracked or faulty. Check the part for cracks, if it is then replace the igniter. If it isn’t cracked, use a multimeter to test for continuity. 

Cycling irregularly?  
Your thermostat might be adjusting incorrectly, causing the furnace to cycle on and off too often. If your thermostat has an adjustable calibration scale, adjust the heat anticipator. If this does not stabilize the unit, you may have to replace the thermostat. 

Not blowing hot air?  
Your blower motor may have completely burnt out. If this doesn’t seem to be the case, then the connecting belt may have simply broken. Test to see if power is reaching the motor. If it does, but isn’t running, the motor has likely failed. If the motor runs but air doesn’t move, the connecting belt has probably broken. You’ll have to replace the belt. 

Blowing too much air?  
The control board regulates the amount of voltage that reaches each functioning part. If the relay that controls the blower motor has failed, it will continually send voltage to the motor. Replace the control board. 
The contact that controls the blower motor on your thermostat may be stuck closed, causing the blower motor to run continuously. Use a multimeter to check for continuity. If it appears the thermostat is the issue, replace it. 

Leaking water?  
Check the drain pipe 
  
Starting and then stopping shortly after? 
Your furnace’s flame sensor monitors the burner, detecting whether a flame is present. If it is either defective or dirty, it will not be able to detect a flame. If dirty, clean the sensor using a fine abrasive pad. If faulty, replace the flame sensor.