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.
Carrier Furnace Repair Guide
What’s Wrong With Your Furnace?
Remember to always turn your furnace completely off before opening it up to look around or attempt any x.
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Carrier Furnace Error Codes
Not
heating?
Circuit
Breaker/Fuse
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.
Igniter
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?
Thermostat
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?
Blower
Motor
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?
Control
Board
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.
Thermostat
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?
Drain Pipe
Starting
and then
stopping
shortly
after?
Flame
Sensor
Your furnace’s ame sensor monitors the burner,
detecting whether a ame is present. If it is either
defective or dirty, it will not be able to detect a
ame.
If dirty, clean the sensor using a ne abrasive pad. If faulty,
replace the ame sensor.
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might be
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