Please note, the following Carrier Repair guide is for informational purposes only. Any servicing you attempt is at your own risk.
➤ A complete Carrier furnace repair guide, from how to replace your air filter, to troubleshooting and error codes, model numbers and more!
Since 1902, Carrier has been a world leader in HVAC systems, consistently innovating with products that ensure high levels of comfort. This guide will provide you with the information you’ll need should your Carrier furnace begin to experience performance issues.
Carrier Furnace Repair Guide
What’s Wrong With Your Carrier Furnace?
Remember to always turn your furnace completely off before opening it up to look around or attempt any fix.
|Is your furnace...
|The problem might be your...
|How you can fix it:
|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.
|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.
|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.
Replacing your air filter will promise a longer, more efficient life for your Carrier furnace. By optimizing the performance of your unit’s internal components you’ll undoubtedly make your home more comfortable.
How to Replace Your Air Filter
- Open the door panel to get access to your Carrier furnace.
- Locate the current filter. Usually found where the cold air enters the unit, either in the cold air return duct or the entrance to the blower chamber.
- Take out the old air filter and replace it with a new one.
- Ensure that the new filter is installed with all “air flow” signifiers facing the correct direction.
- Replace the panel or door to your Carrier furnace.
It’s also important to regularly check vents and registers to make sure that they aren’t blocked, vacuum them to clear up any potential debris.
How soon are you looking to buy?*
Carrier Furnace Error Codes
Each status code is a two-digit number. The first number is determined by the number of short flashes and the second digit by the number of long flashes.
|Carrier Error Code
|What this means
|Steady LED flashing
|Two LED flashes
|Pressure switch stuck closed
|Obstruction in pressure tubing.
|Three LED flashes
|Pressure switch stuck open or manual ON/OFF switch in off position
|Proper vent size; defective inducer motor; excessive wind; faulty pressure switch; disconnected or obstructed pressure tubing; inadequate combustion air supply; or restricted vent
|Four LED flashes
|The limit switch is open
|Loose blower wheel; restricted vent; dirty air filter; defective blower; or excessive wind
|Five LED flashes
|Flame has been sensed out of sequence
|The gas valve is either leaking or stuck open
|Six +1 LED flashes
|Soft lockout: maximum trials for ignition has been reached
|Six +2 LED flashes
|Soft lockout: flame sense was lost while running, a cycling pressure switch, or blocked condensate
|Six +3 LED flashes
|Soft lockout: the pressure switch was opened during run
|Six +4 LED flashes
|Soft lockout: the limit switch was opened during run
|Seven LED flashes
|Soft lockout: the main limit was open for too long (1-hour delay)
When to call a professional to repair your Carrier furnace
Although many Carrier furnace repair issues can be troubleshooted on your own, it’s not a bad idea to contact a trained HVAC technician for some discrepancies.
Should there be a broken internal component that is resulting in your furnace not producing heat, beginning to leak or drip, or producing strange noises (i.e., banging, whistling, or gurgling), this should warrant a call to a local HVAC professional. Alternatively, you should call a technician if your boiler is continuously turning itself on and off –this could mean your furnace is probably not circulating properly.
Who Should You Call?
When you begin looking for a dependable local HVAC company to call for a Carrier furnace repair job, it’s never a bad idea to start by reading some online consumer reviews. These can often give you a good starting point as to what you can expect in relation to costs as well as available services. However, it’s important to remember that these online reviews can’t be trusted altogether to provide you with candid information.
If you’re having trouble choosing the right furnace specialist, we can help! Refer to our own independent certification program to get free quotes from partner heating and cooling companies near you. We guarantee our certified partners meet specific criteria to ensure that Canadian homeowners are able to make informed decisions when it comes to their space heating needs.
Carrier’s Warranty Coverage
Whether you have a furnace in Carrier’s Infinity® Series, Performance™ Series, or their Comfort™ Series, all models come standard with the same comprehensive warranty. This includes a limited lifetime warranty on the heat exchanger as well as a limited 10-year warranty on parts. Optional labour warranty is also available depending on your installation.
Carrier Furnace Model Numbers
Discontinued Carrier Furnace Models