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
CONTINUOUS ON - Control has 24VAC power.
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 codes are erased when power
(115VAC or 24VAC) to control is interrupted or 48 hours after each fault is cleared.
12BLOWER ON AFTER POWER UP (115VAC or 24 VAC) - Blower runs for 90 seconds, if unit is powered up during a call for heat
13LIMIT OR FLAME
14IGNITION LOCKOUT - Control will
21GAS HEATING LOCKOUT - Control will NOT auto reset.
Check for: - |
22ABNORMAL
| Check for: | - 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. |
31PRESSURE, DRAFT SAFEGUARD,
(DOWNFLOW ONLY*) If open longer than five minutes, inducer shuts off for 15
minutes before retry. | Check for: | - Proper vent sizing |
- Low inducer voltage (115VAC) | - Defective inducer motor | |
*- Defective Blower motor or capacitor | - Restricted vent | |
- Defective pressure switch | - Excessive wind |
-Inadequate combustion air supply
-Disconnected or obstructed pressure tubing
If it opens after trial for ignition period, blower will come on for 90 second recycle delay.
33LIMIT OR FLAME
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
-Open Flame
34IGNITION PROVING FAILURE - Control will try three more times before 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 |
- Low inlet gas pressure. | - Control ground continuity |
-Green wire MUST be connected to furnace sheet metal.
-Inadequate flame carryover or rough ignition.
-Flame sensor must be ungrounded.
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
9 | 6 | 3 |
8 | 5 | 2 |
7 | 4 | 1 |
LED | TEST |
HUM Com W Y R G
24V
A99233
Fig. 8ÐService Label
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