Carrier Complete Guide to Furnace Status Codes and Troubleshooting for Optimal Performance

SERVICE

If status code recall is needed, do not remove power or blower door. Briefly remove and then reconnect one main limit wire to display stored status code.

LED CODE	STATUS
CONTINUOUS OFF -	Check for 115VAC at L1 and L2, and 24VAC at SEC-1 and
CONTINUOUS ON -	SEC-2.
	Control has 24V power.

RAPID FLASHING - Line voltage (115V) polarity reversed. If twinned, refer to twinning kit instructions.

EACH OF THE FOLLOWING STATUS CODES IS A TWO DIGIT NUMBER WITH THE FIRST DIGIT DETERMINED BY THE NUMBER OF SHORT FLASHES AND THE SECOND DIGIT BY THE NUMBER OF LONG FLASHES.

11NO PREVIOUS CODE - Stored status codes are erased when power

(115V or 24V) to control is interrupted or 48 hours after each fault is cleared.

12BLOWER ON AFTER POWER UP (115V or 24V) - Blower runs for 90 seconds, if unit is powered up during a call for heat (R-W closed).

13LIMIT OR FLAME ROLL-OUT SWITCH LOCKOUT - Control will auto reset after three hours unless flame roll-out switch or fuse link is opened, refer to #33.

14IGNITION LOCKOUT - Control will auto-reset after three hours. Refer to #34.

21GAS HEATING LOCKOUT - Control will NOT auto reset.

Check for: - Mis-wired gas valve -Defective control (valve relay)

22ABNORMAL FLAME-PROVING SIGNAL - Flame is proved while gas valve is de-energized. Inducer will run until fault is cleared.

Check for: - Leaky gas valve -Stuck-open gas valve

23PRESSURE SWITCH (ES) DID NOT OPEN Check for:

- Obstructed pressure tubing. - Defective pressure switch (stuck closed).

24SECONDARY VOLTAGE FUSE IS OPEN

Check for: - Short circuit in secondary voltage (24V) wiring.

31 PRESSURE, DRAFT SAFEGUARD, AUXILIARY-LIMIT (when used) , OR BLOCKED

VENT SHUTOFF (when used) SWITCH DID NOT CLOSE OR REOPENED - If open longer than five minutes, inducer shuts off for 15 minutes before retry.

Check for: - Inadequate Combustion air supply.

-Proper vent sizing and condensate pitch or sag

-Low inducer voltage.

-Vent restriction or high winds.

-Disconnected or obstructed pressure tubing

-Defective inducer motor or start capacitor.

-Defective pressure switch or connections. If it opens after trial for ignition period, blower will come on for 90 second recycle delay.

33LIMIT OR FLAME ROLL-OUT SWITCH IS OPEN - If open longer than three minutes, code changes to #13. Flame roll-out switch requires manual reset. Check for: - Defective blower motor or capacitor.

-Dirty filter or restricted duct system.

-Loose blower wheel.

-Defective switch or connections.

-Inadequate Combustion air supply (Flame Roll-out Switch or fuse link).

-Open Flame Roll-out switch,or fuse link. Manual reset or replace.

34IGNITION PROVING FAILURE - Control will try three more times before a lockout #14 occurs. If flame signal lost after trial for ignition period, blower will come on for 90 second recycle delay. Check for:

-Oxide buildup on flame sensor (clean with fine steel wool).

-Proper flame sense microamps (.5 microamps D.C. min., 4.0 - 6.0 nominal).

-Gas valve defective or gas valve turned off.

-Defective Hot Surface Ignitor

-Manual valve shut-off.

-Low inlet gas pressure.

-Green wire MUST be connected to furnace sheet metal.

-Inadequate flame carryover or rough ignition.

COMPONENT TEST

To initiate the component test sequence,shut OFF the room thermostat or disconnect the "R" thermostat lead. Briefly short the TEST terminal to the "Com 24V" terminal. Status LED will flash code and then turn ON the inducer motor. The inducer motor will run for the entire component test. The hot surface ignitor, blower motor-heat speed, and blower motor-cool speed will be turned ON for 10-15 seconds each. Gas Valve and Humidifier will not be turned on.

9	6	3
8	5	2
7	4	1

STATUS

→

TEST	HUM Com W	Y	R	G
	24V

320615-102 REV. J

A99107

Fig. 16ÐService Label

12