SERVICE
If status code recall is needed, briefly remove then reconnect one main limit wire to display stored status code. On RED LED boards do not remove power or blower door before initiat- ing status code recall. After status code recall is completed component test will occur.
LED CODE | STATUS |
CONTINUOUS OFF - Check for 115VAC at L1 & L2, & 24VAC at
RAPID FLASHING - Line voltage (115VAC) 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 code is erased automatically after 72 hours. On RED LED boards stored status codes can also be erased when power
(115 VAC or 24 VAC) to control is interrupted.
12 BLOWER ON AFTER POWER UP (115 VAC or 24 VAC)
13LIMIT CIRCUIT LOCKOUT - Lockout occurs if the limit or flame rollout switch is open longer than 3 minutes.
- Control will auto reset after three hours. | - Refer to #33. |
14IGNITION LOCKOUT - Control will
21GAS HEATING LOCKOUT - Control will NOT auto reset.
Check for: - |
22ABNORMAL
| - Leaky gas valve | - |
23 | PRESSURE SWITCH DID NOT OPEN Check for: | |
| - Obstructed pressure tubing. - Pressure switch stuck closed. | |
24 | SECONDARY VOLTAGE FUSE IS OPEN Check for: | |
| - Short circuit in secondary voltage (24VAC) wiring. | |
31 | PRESSURE SWITCH DID NOT CLOSE OR REOPENED - If open longer than | |
| five minutes, inducer shuts off for 15 minutes before retry. Check for: | |
| - Excessive wind - Proper vent sizing | - Defective inducer motor |
| - Low inducer voltage (115VAC) | - Defective pressure switch |
| - Inadequate combustion air supply | - Restricted vent |
- Disconnected or obstructed pressure tubing - Low inlet gas pressure (if LGPS used)
If it opens during blower
33LIMIT CIRCUIT FAULT - Indicates a limit, or flame rollout is open. Blower will
run for 4 minutes or until open switch remakes whichever is longer. If open longer than 3 minutes, code changes to lockout #13. If open less than 3 minutes status code #33 continues to flash until blower shuts off. Flame rollout switch
requires manual reset. Check for: - Restricted vent |
| |
- Proper vent sizing | - Loose blower wheel | - Excessive wind |
- Dirty filter or restricted duct system. |
| |
- Defective blower motor or capacitor. - Defective switch or connections. - Inadequate combustion air supply (Flame
34IGNITION PROVING FAILURE - Control will try three more times before lockout #14 occurs. If flame signal lost during blower
-Flame sensor must not be grounded
-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 | - Manual valve |
-Defective Hot Surface Ignitor
-Low inlet gas pressure
-Inadequate flame carryover or rough ignition
-Green/Yellow wire MUST be connected to furnace sheet metal
45CONTROL CIRCUITRY LOCKOUT
- Gas valve relay stuck open - Flame sense circuit failure - Software check error
Reset power to clear lockout. Replace control if status code repeats.
COMPONENT TEST 
To initiate the component test sequence, shut OFF the room thermostat or disconnect the "R" thermostat lead. Briefly short the TEST/TWIN terminal to the "Com 24V" ter- minal. 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 FAN speed (AMBER LED boards only) blower motor HEAT speed, and blower motor COOL speed will be turned ON for
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