Coleman Troubleshooting
Coleman Furnace Error Codes — What the Flashes Mean
Coleman furnaces (built by the York/Johnson Controls family) report faults with a status LED that flashes in a repeating count. There's a lot of Coleman equipment in Brooklyn two-families and rowhouses — here's how to read yours.
Anatomy of the system
Numbered parts below match the cost table further down — so you can see exactly where the failure usually sits.
Common Coleman flash codes
Count the red LED flashes between pauses, visible through the sight glass in the blower door. Coleman boards vary by series (Echelon, Comfort, LX) — the legend sticker inside your door is the authority for your model.
| Code | What it usually means | What to do |
|---|---|---|
| 2 flashes | Pressure switch stuck closed before startup | Call — switch or inducer diagnosis. |
| 3 flashes | Pressure switch open — venting or inducer motor problem | Check the outside vent pipe for blockage. If clear, call. |
| 4 flashes | High limit or rollout switch open — overheating | Change the filter. If it repeats with a clean filter, call. |
| 5 flashes | Flame detected out of sequence | Shut the furnace off and call right away. |
| 6 flashes | Pressure switch cycled open repeatedly — lockout | Call — usually venting or inducer related. |
| 7 flashes | Ignition lockout — failed to light after retries | One reset at the power switch. If it locks out again, call. |
| Steady on / steady off | Normal standby on some boards; no power or failed board on others | Check the furnace switch and breaker, then compare against your door sticker. If unsure, call. |
If you smell gas at any point: don't touch switches, leave the building, and call 911 and your gas utility from outside. No error code matters more than that.
Signs and symptoms
What to notice before calling a technician. The red callouts mean stop and call us immediately.
- 1
Find the LED and count the flashes
Look through the sight glass in the lower furnace panel for the status LED. Count the flashes between pauses — that's the code. The legend sticker inside the blower door decodes it for your exact board.
What to notice
- Count the pattern twice to confirm
- Photograph the door sticker legend
- Note the furnace behavior — clicking, humming, blower running with no heat
Still not working? Call (347) 997-3360 — diagnostic visits are flat-rate, quoted before we start.
- 2
One safe reset — once only
Flip the furnace power switch off for 60 seconds, then back on. An ignition lockout (7 flashes) gets a fresh attempt after reset. If it locks out again, the cause is real — igniter, flame sensor, or gas supply — and needs a tech.
Never bypass a safety switch
Pressure switches, limit switches, and rollout switches exist to keep flue gases and carbon monoxide out of your home. Jumping one to force heat is genuinely dangerous. One reset, then call (347) 997-3360. - 3
The two free checks
A clogged filter drives 4-flash overheating trips; a blocked vent drives 3-flash pressure faults. Check both before booking anything — it takes two minutes.
What to notice
- Look at the filter — replace if it's gray with dust
- Make sure the vent termination outside is clear of snow, leaves, and nests
Still not working? Call (347) 997-3360 — diagnostic visits are flat-rate, quoted before we start.
- 4
Text us the code
Text the flash count plus a photo of the data plate to (347) 997-3360. Coleman shares parts with York and Luxaire, so most repairs use common stock we can bring on the first visit.
What this usually costs in Brooklyn
When a technician diagnoses the issue, here's the typical cost range for the repair. The exact number depends on parts, access, and how long it's been failing.
| Issue | Likely cause | Typical range |
|---|---|---|
| Diagnostic visit | Confirm what tripped the code | $125 – $225 |
| Flame sensor cleaning | Short cycling, weak flame signal | $125 – $250 |
| Igniter replacement | 7-flash ignition lockouts | $225 – $450 |
| Pressure switch replacement | 2, 3, and 6 flash faults | $225 – $475 |
| High-limit / rollout switch | 4 flashes — overheating | $200 – $400 |
| Inducer motor replacement | Venting faults that persist | $450 – $950 |
| Control board replacement | Dead or erratic board | $450 – $900 |
Diagnostic visit
Confirm what tripped the code
$125 – $225
Flame sensor cleaning
Short cycling, weak flame signal
$125 – $250
Igniter replacement
7-flash ignition lockouts
$225 – $450
Pressure switch replacement
2, 3, and 6 flash faults
$225 – $475
High-limit / rollout switch
4 flashes — overheating
$200 – $400
Inducer motor replacement
Venting faults that persist
$450 – $950
Control board replacement
Dead or erratic board
$450 – $900
Typical range. Final cost confirmed on site after diagnosis.
Common Questions
What to do next
Call (347) 997-3360 or book a diagnostic. Tell us what you observed — the sounds, the symptoms, when it started — and we'll know exactly what to check.
Do not attempt any repairs yourself. Gas, electrical, and refrigerant work requires a licensed technician.
Need a Brooklyn tech today?
Same-day diagnostics when we can fit you in. Flat-rate visit, quoted before we start.
(347) 997-3360