| Heartbeat LED pattern on solid |
The control is locked out and will auto-reset after 1 hour. |
Reset power to clear the lockout. |
| Two LED flashes |
Pressure switch didn’t open. |
Obstructed pressure tubing; a pressure switch that’s stuck closed. |
| Three LED flashes |
The low-pressure switch did not close or has reopened. |
Proper vent sizing; air leak; restricted vent; clogged condensate drain; low input gas pressure; excessive wind; improper pressure switch wiring; water in vent piping; disconnected or obstructed pressure tubing. |
| Four LED flashes |
Limit circuit fault. |
Loose blower wheel; defective switch or connections; improper minimum- or maximum-heat gas input adjustment; dirty filter or restricted duct system; improper limit switch. |
| Five LED flashes |
Abnormal flame-proving signal. |
Leaky gas valve; stuck-open gas valve. |
| Six LED flashes |
Ignition proving a failure. |
Low inlet gas pressure; control ground continuity; gas valve defect; defective hot surface igniter; oxide buildup on the flame sensor; inadequate flame carryover; flame sensor mustn’t be grounded. |
| Seven LED flashes |
Limit circuit lockout. |
Control will auto-reset after 3 hours. Refer to status code #4. |
| Eight LED flashes |
Gas heating lockout. |
Gas valve stuck closed on control. |
| Nine LED flashes |
Medium pressure switch, high-pressure switch, or PSR relay didn’t close or was reopened. |
Refer to status code #3. |
| Ten LED flashes |
Polarity. |
Correct line voltage polarity. |
| Status codes 1 + 2 |
Blower on after power up. |
Normal operation. |
| Status codes 1 + 5 |
Blower motor lockout. |
Control will auto-reset after 3 hours. Refer to status code #4 + 1. |
| Status codes 3 + 5 |
Gas valve fault. |
RED, YELLOW, or ORANGE wire at the gas valve. |
| Status codes 4 + 1 |
Blower motor fault. |
Blower failed to reach 250 RPM, or the blower failed to communicate within the prescribed time limits. |
| Status codes 4 + 2 |
Inducer motor fault. |
Proper vent sizing; restricted vent; failed inducer motor; improper motor wiring; a blockage in the tubing to the pressure switch assembly. |
| Status codes 4 + 3 |
The low or medium pressure switch is open while the medium or high-pressure switch is closed. |
Low inlet gas pressure; clogged condensate drain; improper pressure switch wiring; water in vent piping; low or medium pressure switch stuck open; disconnected or obstructed pressure tubing. |
| Status codes 6 + 1 |
Ignition lockout. |
Control will auto-reset after 3 hours. Refer to status code #6. |
