TROUBLESHOOTING CHART
Symptoms of Abnormal | Associated |
| Fault Description(s) | Possible Causes | Corrective Action | Cautions and Notes | ||
Operation | LED Code2 |
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• Furnace fails to operate. |
| NONE | • No 115 volt power to | • Manual disconnect switch | • Assure 115 and 24 volt | • Turn power OFF | ||
• Integrated control module |
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| furnace, or no 24 volt | OFF, door switch open, or | power to furnace | prior to repair. |
diagnostic LED provides |
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| power to integrated | 24 volt wires improperly | integrated control module. | • Replace integrated |
no signal. |
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| control module. | connected or loose. | • Check integrated control | control module |
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| • Blown fuse or circuit | • Blown fuse or circuit | module fuse (3A). | fuse with 3A | |
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| breaker. | breaker. | Replace if necessary. | automotive fuse. |
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| • Check for possible shorts | • Read precautions |
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| • Integrated control | • Integrated control module | in 115 and 24 volt circuits. | in “Electrostatic | |
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| module has an | Repair as necessary. | Discharge” section | |
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| internal fault. | has an internal fault. | • Replace bad integrated | of manual. |
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| control module. |
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• LED is Steady On. |
| ON |
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| • Normal Operation | •Normal Operation | • None | •Normal Operation |
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| CONTINUOUS |
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| ON |
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• Furnace fails to operate. |
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| • Furnace lockout due | • Failure to establish flame. | • Locate and correct gas | • Turn power | |
• Integrated control module | 1 |
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| to an excessive | Cause may be no gas to | interruption. | OFF prior to | |
diagnostic LED is |
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| number of ignition | burners, front cover | • Check front cover | repair. |
flashing ONE (1) flash. |
| 1 FLASH |
| “retries” (3 total)1. | pressure switch stuck open, | pressure switch |
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| bad igniter or igniter | operation (hose, wiring, |
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| alignment, improper orifices, | contact operation). |
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| or coated/oxidized or | Correct if necessary. |
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| improperly connected flame | • Replace or realign | • Igniter is |
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| sensor. | ||
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| igniter. | ||
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| fragile, handle | |
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| • Check flame sense | |
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| • Loss of flame after establish- | with care. | |
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| signal. Sand sensor if | • Sand flame | |
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| ment. Cause may be | ||
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| coated and/or oxidized. | ||
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| interrupted gas supply, lazy | sensor with | |
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| • Check flue piping for | ||
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| burner flames (improper gas | emery cloth. | |
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| pressure or restriction in flue | blockage, proper | • See “Vent/Flue |
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| length, elbows, and | ||
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| and/or combustion air | Pipe” section | |
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| termination. | ||
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| piping), front cover pressure | for piping | |
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| • Verify proper induced | ||
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| switch opening, or improper | details. | |
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| induced draft blower | draft blower perfor- |
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| performance. | mance. |
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• Furnace fails to operate. |
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| • | Pressure switch | • Induced draft blower | • Replace induced draft | • Turn power OFF |
• Integrated control module | 2 |
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| circuit is closed. | pressure switch contacts | blower pressure switch. | prior to repair. | |
diagnostic LED is |
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| • | Induced draft | sticking. |
| • Replace pressure |
flashing TWO (2) flashes. | 2 FLASHES |
| blower is not | • Shorts in pressure switch | • Repair short. | switch with proper | ||
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| operating. | circuit. |
| replacement part. |
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• Induced draft blower runs |
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| • | Pressure switch | • Pressure switch hose | • Inspect pressure | • Turn power |
continuously with no | 3 |
| • | circuit not closed. | blocked, pinched or | switch hose. Repair, if | OFF prior to | |
further furnace operation. |
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| Induced draft blower | connected improperly. | necessary, | repair. | |
• Integrated control module | 3 FLASHES |
| is operating. | • Blocked flue and/or inlet air | • Inspect flue and/or inlet | • Replace | ||
diagnostic LED is |
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| pipe, blocked drain system, | air piping for blockage, | pressure |
flashing THREE (3) |
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| or weak induced draft | proper length, elbows, | switch with |
flashes. |
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| blower. | and termination. Check | proper |
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| • Incorrect pressure switch | drain system. Correct | replacement |
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| setpoint or malfunctioning | as necessary. | part. |
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| switch contacts. | • Correct pressure switch |
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| • Loose or improperly | setpoint or contact |
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| connected wiring. | motion. |
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| • Tighten or correct |
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| wiring connection. |
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1Integrated control module will automatically attempt to reset from lockout after one hour.
2LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.
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