OEM Control Family: Johnson Controls S1-33103010000 / 031-01267 • Residential & DGAA Mobile Home
York, Coleman, Luxaire & Evcon Furnace Blink Codes Decoder (2–9 Red Flashes)
⚡ Instant OEM Answer (York / Coleman / Luxaire / Evcon LED System):
Johnson Controls boards use Green for idle standby, Amber for active flame, and Red Flashes for faults: 3 Red Flashes = Pressure Switch Open; 4 Red Flashes = High Limit Open (escalates to 6 Red Flashes after 3 trips); 5 Red Flashes = Manual Flame Rollout Open; and 7 Red Flashes = 1-Hour Ignition Lockout (clean sensor below
1.5 µA DC or test 40–85 Ω igniter).
Johnson Controls / Source 1 Master Matrix
Complete York, Coleman, Luxaire & Evcon Tri-Color & Red Flash Chart
Covers York Diamond 80/90, Latitude, Affinity (GY8S, GY9S, TG8S, TG9S, TM8X, TM9V), Luxaire Acclimate, and Coleman / Evcon residential & HUD manufactured-home furnaces (DGAA, DGAT, DGAM, MG9S).
| LED Color & Count | York / Coleman OEM Meaning | Source 1 OEM Part SKU | Primary Fix & Multimeter Check |
|---|---|---|---|
| Green Steady / Flash | Normal Idle Standby / Call | S1-33103010000 | Zero active faults; Amber heartbeat = normal burner flame established. |
| Steady Solid Red | Internal Control Failure / Hard Fault | S1-33103010000 / 50A55 | Cycle 120V power; if solid red persists with 24VAC present, replace board. |
| 1 Red Flash | Flame Sensed With Gas Valve Off | S1-32536835000 | Inspect 24V gas valve shutoff seat and dry moisture from board flame terminal. |
| 2 Red Flashes | Pressure Switch Stuck Closed | S1-02427666001 | Drain condensate droplet from silicone hose or replace welded pressure switch. |
| 3 Red Flashes | Pressure Switch Stuck Open | S1-02427666001 / 024-35271 | Flush condensate trap, clear inducer barb, inspect DGAA concentric roof-jack vent. |
| 4 Red Flashes | Open High Limit Switch | S1-02529041000 | Replace clogged air filter immediately; open supply dampers & check capacitor µF. |
| 5 Red Flashes | Open Flame Rollout Switch | S1-02527747009 | CRITICAL: Inspect burner box & heat exchanger before pressing manual rollout pin. |
| 6 Red Flashes | 1-Hour High Limit Lockout (3 Trips) | S1-02529041000 | Escalated from 4 Flashes after 3 consecutive overheat cycles in one heat demand. |
| 7 Red Flashes | 1-Hour Ignition Lockout (3 Retries) | S1-02537499000 (Sensor) S1-02532625000 (HSI) |
Polish flame sensor rod (≥ 1.5 µA DC) or swap cracked igniter (40–85 Ω cold). |
| 8 / 9 Red Flashes | 115V Polarity Reversed / Ground Fault | Line L1 / Neutral | Verify 120V Hot-to-Ground and < 2.0 VAC Neutral-to-Ground; bond generator neutral. |
💡 Coleman / Evcon DGAA & DGAT Mobile Home Booster Motor Note:
On sealed-combustion Coleman
DGAA and DGAT downflow closet furnaces, a noisy or sluggish upper combustion air booster motor—or a separated inner aluminum exhaust pipe inside the rooftop concentric jack—causes intermittent 3 Red Flashes during windy nights. Also check the washable mesh filter clipped directly inside the louvered front closet door!