Coleman
Coleman Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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1 GREEN FLASH
Status LED flashes green once repeatedly; furnace does not start heating cycle.
System in Idle / Normal Standby
1 RED FLASH
Furnace will not start; status LED shows 1 red flash repeating; inducer and blower do not run.
Ignition Failure Lockout
2 GREEN FLASHES
Status LED flashes green twice repeatedly; blower may run briefly; furnace does not heat.
Low-Voltage Fuse Open or Short in Thermostat Circuit
2 RED FLASHES
Furnace attempts to start but shuts down quickly; status LED shows 2 red flashes repeating; inducer may start, burners light briefly then go out.
Pressure Switch Stuck Closed
3 GREEN FLASHES
Status LED flashes green three times repeatedly; furnace may start but shut down unexpectedly.
Limit or Rollout Switch Open (Soft Lockout)
3 RED FLASHES
Furnace starts inducer but burners do not light; status LED shows 3 red flashes repeating; you may hear the ignitor but no flame.
Pressure Switch Stuck Open or Failed to Close
4 GREEN FLASHES
Status LED flashes green four times repeatedly; blower may run continuously; furnace does not heat.
Open High Limit or Open Auxiliary Limit
4 RED FLASHES
Burners ignite but shut off quickly; status LED shows 4 red flashes repeating; furnace may short-cycle on ignition attempts.
Open High Limit Switch
5 GREEN FLASHES
Status LED flashes green five times repeatedly; furnace may start but lock out after several failed ignition attempts.
Ignition Retry or Soft Lockout
5 RED FLASHES
Furnace will not start; status LED shows 5 red flashes repeating; blower may run continuously.
Flame Sensed with Gas Valve Off (False Flame Signal)
6 RED FLASHES
Furnace will not start; status LED shows 6 red flashes repeating; inducer may run briefly then stop.
Pressure Switch Cycle Lockout or Venting Problem
7 RED FLASHES
Furnace will not start; status LED shows 7 red flashes repeating; blower may run for a short time then stop.
Flame Rollout or Manual Reset Limit Open
8 RED FLASHES
Furnace will not start; status LED shows 8 red flashes repeating; blower may run continuously.
Low Flame Sense or Reversed Polarity
9 RED FLASHES
Furnace will not start; status LED shows 9 red flashes repeating; no ignition sequence begins.
Reversed Line and Neutral or Ground Fault
RAPID GREEN FLASH
Status LED flashes green rapidly; furnace blower runs but burners do not ignite.
Continuous Fan Mode or Cooling Call Only
STEADY GREEN ON
Status LED is solid green; furnace appears to have power but does not respond to thermostat; no inducer or blower operation.
No Call for Heat or Thermostat Circuit Open
STEADY RED ON
Status LED is on solid red with no flashing; furnace does not respond to thermostat commands.
Control Board Internal Fault
Symptom
Furnace blower starts but burners never ignite; you hear a click but no flame.
Failed Ignitor or Gas Valve Not Opening
Symptom
Furnace cycles on and off rapidly (every 1–5 minutes) without reaching set temperature; LED shows no fault code.
Thermostat or Control Anticipator Issue
Symptom
Furnace frequently trips the household circuit breaker.
Electrical Overload or Short Circuit
Symptom
Furnace makes loud banging or booming noise at startup.
Delayed Ignition or Burner Light-Off Problem
Symptom
Furnace produces a high-pitched squealing or screeching noise during operation.
Blower or Inducer Motor Bearing Failure
Symptom
Furnace produces a strong gas smell when attempting to ignite.
Gas Leak or Failed Ignition
Symptom
Furnace runs but does not produce enough heat; home takes a long time to warm up or never reaches set temperature.
Underfiring or Low Heat Output
Symptom
Furnace runs but some rooms are too cold while others are too hot.
Air Distribution or Duct Imbalance
Symptom
Furnace short cycles: starts, runs for a few minutes, then shuts off and restarts frequently.
Short Cycling Due to Overheating or Oversizing
Symptom
Furnace starts and runs but shuts off after 30–60 seconds; blower may continue to run.
Flame Loss During Run
Symptom
Furnace starts normally but shuts down when the blower starts.
Blower-Induced Flame Disturbance or Voltage Drop
Symptom
Furnace vibrates excessively or rattles during operation.
Mechanical Vibration or Loose Components
Symptom
Furnace will not start at all; no inducer, no blower, no LED lights.
No Power to Furnace
Symptom
Indoor blower runs continuously even when thermostat is not calling for heat or fan.
Blower Stuck in Fan-On or Fault Mode
Symptom
Inducer motor runs continuously but burners never ignite.
Stuck Pressure Switch or Failed Ignition Sequence
Symptom
Strong burning or electrical smell when furnace runs.
Overheating Components or Electrical Fault
Symptom
Thermostat clicks and calls for heat, but furnace does nothing.
Open Control Circuit or Failed Control Board
Symptom
Water leaking around the base of the furnace or inside the blower compartment.
Condensate Drain or Trap Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| 1 GREEN FLASH |
Status LED flashes green once repeatedly; furnace does not start heating cycle.
|
System in Idle / Normal Standby | View Details |
| 1 RED FLASH |
Furnace will not start; status LED shows 1 red flash repeating; inducer and blower do not run.
|
Ignition Failure Lockout | View Details |
| 2 GREEN FLASHES |
Status LED flashes green twice repeatedly; blower may run briefly; furnace does not heat.
|
Low-Voltage Fuse Open or Short in Thermostat Circuit | View Details |
| 2 RED FLASHES |
Furnace attempts to start but shuts down quickly; status LED shows 2 red flashes repeating; inducer may start, burners light briefly then go out.
|
Pressure Switch Stuck Closed | View Details |
| 3 GREEN FLASHES |
Status LED flashes green three times repeatedly; furnace may start but shut down unexpectedly.
|
Limit or Rollout Switch Open (Soft Lockout) | View Details |
| 3 RED FLASHES |
Furnace starts inducer but burners do not light; status LED shows 3 red flashes repeating; you may hear the ignitor but no flame.
|
Pressure Switch Stuck Open or Failed to Close | View Details |
| 4 GREEN FLASHES |
Status LED flashes green four times repeatedly; blower may run continuously; furnace does not heat.
|
Open High Limit or Open Auxiliary Limit | View Details |
| 4 RED FLASHES |
Burners ignite but shut off quickly; status LED shows 4 red flashes repeating; furnace may short-cycle on ignition attempts.
|
Open High Limit Switch | View Details |
| 5 GREEN FLASHES |
Status LED flashes green five times repeatedly; furnace may start but lock out after several failed ignition attempts.
|
Ignition Retry or Soft Lockout | View Details |
| 5 RED FLASHES |
Furnace will not start; status LED shows 5 red flashes repeating; blower may run continuously.
|
Flame Sensed with Gas Valve Off (False Flame Signal) | View Details |
| 6 RED FLASHES |
Furnace will not start; status LED shows 6 red flashes repeating; inducer may run briefly then stop.
|
Pressure Switch Cycle Lockout or Venting Problem | View Details |
| 7 RED FLASHES |
Furnace will not start; status LED shows 7 red flashes repeating; blower may run for a short time then stop.
|
Flame Rollout or Manual Reset Limit Open | View Details |
| 8 RED FLASHES |
Furnace will not start; status LED shows 8 red flashes repeating; blower may run continuously.
|
Low Flame Sense or Reversed Polarity | View Details |
| 9 RED FLASHES |
Furnace will not start; status LED shows 9 red flashes repeating; no ignition sequence begins.
|
Reversed Line and Neutral or Ground Fault | View Details |
| RAPID GREEN FLASH |
Status LED flashes green rapidly; furnace blower runs but burners do not ignite.
|
Continuous Fan Mode or Cooling Call Only | View Details |
| STEADY GREEN ON |
Status LED is solid green; furnace appears to have power but does not respond to thermostat; no inducer or blower operation.
|
No Call for Heat or Thermostat Circuit Open | View Details |
| STEADY RED ON |
Status LED is on solid red with no flashing; furnace does not respond to thermostat commands.
|
Control Board Internal Fault | View Details |
| – |
Furnace blower starts but burners never ignite; you hear a click but no flame.
|
Failed Ignitor or Gas Valve Not Opening | View Details |
| – |
Furnace cycles on and off rapidly (every 1–5 minutes) without reaching set temperature; LED shows no fault code.
|
Thermostat or Control Anticipator Issue | View Details |
| – |
Furnace frequently trips the household circuit breaker.
|
Electrical Overload or Short Circuit | View Details |
| – |
Furnace makes loud banging or booming noise at startup.
|
Delayed Ignition or Burner Light-Off Problem | View Details |
| – |
Furnace produces a high-pitched squealing or screeching noise during operation.
|
Blower or Inducer Motor Bearing Failure | View Details |
| – |
Furnace produces a strong gas smell when attempting to ignite.
|
Gas Leak or Failed Ignition | View Details |
| – |
Furnace runs but does not produce enough heat; home takes a long time to warm up or never reaches set temperature.
|
Underfiring or Low Heat Output | View Details |
| – |
Furnace runs but some rooms are too cold while others are too hot.
|
Air Distribution or Duct Imbalance | View Details |
| – |
Furnace short cycles: starts, runs for a few minutes, then shuts off and restarts frequently.
|
Short Cycling Due to Overheating or Oversizing | View Details |
| – |
Furnace starts and runs but shuts off after 30–60 seconds; blower may continue to run.
|
Flame Loss During Run | View Details |
| – |
Furnace starts normally but shuts down when the blower starts.
|
Blower-Induced Flame Disturbance or Voltage Drop | View Details |
| – |
Furnace vibrates excessively or rattles during operation.
|
Mechanical Vibration or Loose Components | View Details |
| – |
Furnace will not start at all; no inducer, no blower, no LED lights.
|
No Power to Furnace | View Details |
| – |
Indoor blower runs continuously even when thermostat is not calling for heat or fan.
|
Blower Stuck in Fan-On or Fault Mode | View Details |
| – |
Inducer motor runs continuously but burners never ignite.
|
Stuck Pressure Switch or Failed Ignition Sequence | View Details |
| – |
Strong burning or electrical smell when furnace runs.
|
Overheating Components or Electrical Fault | View Details |
| – |
Thermostat clicks and calls for heat, but furnace does nothing.
|
Open Control Circuit or Failed Control Board | View Details |
| – |
Water leaking around the base of the furnace or inside the blower compartment.
|
Condensate Drain or Trap Leak | View Details |
No matching codes found
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