Each status code is a two-digit number. The rst number is determined by the number of short ashes and the
second digit by the number of long ashes.
When to call a professional to repair your Carrier
furnace
Error
Code 1-
2
The blower is on after
power up
Blower runs for 90 seconds if the unit is powered up during a call for heat.
Error
Code 2-
4
Secondary voltage
fuse is open
Check for a short circuit in the secondary voltage wiring.
Error
Code 3-
1
Pressure, draft
safeguard, aux-limit
switch, or blocked
vent switch didn’t
close (or reopened,
down ow only)
If open for longer than 5 minutes, the inducer will shut off for 15 minutes before retry. Check for: low inducer
voltage; proper vent sizing; defective inducer motor; defective blower motor or capacitor; defective pressure
switch; restricted vent; excessive wind, inadequate combustion air supply; or obstructed pressure tubing.
Error
Code 2-
3
Pressure switch
didn’t open
Check for an obstruction in the pressure tubing or a pressure switch that is stuck closed.
Error
Code 1-1
No previous code
Stored status codes are erased when power to control is interrupted.
Rapid
LED
ashing
Line voltage polarity
is reversed.
If twinned, refer to twinning kit instructions.
Error
Code 1-
3
Limit or ame roll-out
switch lockout
Control will auto-reset after 3 hours. Reset the switch or replace fuse link.
Error
Code 3-
3
Limit or ame roll-out
switch is open
If the switch is open for longer than 3 minutes, the code will change to #1-3. Flame roll-out switch requires
manual reset. Check for: defective blower motor or capacitor; dirty lter or restricted duct system; loose
blower wheel; faulty switch or connections; or inadequate combustion air supply.
Error
Code 3-
4
Ignition proving
failure
Control will try three more times before lockout #1-4 will occur. If the ame signal is lost after the trial for
ignition period, the blower will come on for a 90 second recycle delay. Check for: build-up on the ame
sensor; proper microamp distribution to the ame sensor; defective gas valve or turned off gas valve; faulty
hot surface ignitor; low inlet gas pressure; the manual valve is shut-off; continuity of control ground; low
ame carryover or rough ignition; ungrounded ame sensor.
Error
Code 1-
4
Ignition lockout
Control will auto-reset after 3 hours.
Error
Code 2-
1
Gas heating lockout
Control won’t auto-reset. Check for either a badly-wired gas valve or a defective control.
Error
Code 2-
2
Abnormal ame-
proving signal
Flame is proved while the gas valve is de-energized. Check for either a leaky or stuck-open gas valve.
Carrier
Error
Code
What this means
Action required
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