Atlantic
Atlantic Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Furnace does not start, no burner ignition, and the control panel shows E01 shortly after a call for heat.
Ignition Failure Lockout
E02
The furnace attempts to start but shuts down quickly, the control shows E02, and there is no sustained flame.
Flame Detection Failure
E03
The furnace will not start, the inducer fan does not run, and the display shows E03 shortly after a heat call.
Inducer Fan Failure / Pressure Switch Not Proving
E04
The furnace starts, the inducer runs, but the burners do not light, and E04 is displayed.
Gas Valve or Gas Supply Fault
E05
The furnace shuts down during operation, the control shows E05, and the blower may continue to run.
High Limit Switch Open / Overheat Condition
E06
The furnace stops and displays E06, often after several failed ignition attempts or erratic operation.
Control Board Communication / Internal Fault
E07
The furnace locks out with E07, often accompanied by a strong draft or wind noise in the vent system.
Flue Gas / Draft Fault
E08
The furnace displays E08 and does not respond to thermostat commands.
Thermostat / Low-Voltage Control Fault
E09
The furnace displays E09 and shuts down, often after running for a short period.
Rollout Switch Tripped
E10
The furnace displays E10; the blower may run continuously, but there is no heat output.
Supply Air Temperature Sensor Fault
E11
The furnace displays E11 and will not start, often after a power outage or wiring work.
Polarity / Grounding Error
E12
The furnace displays E12, runs briefly, then shuts down with no heat reaching the home.
Return Air Temperature Sensor Fault
E13
The furnace displays E13 and will not ignite, often in very cold conditions.
Low Gas Pressure / Gas Supply Fault
E14
The furnace displays E14; the blower may run, but the burners do not light.
Ignition Lockout Due to Repeated Failures
E15
The furnace displays E15 and stops, often during blower operation changes.
Blower Motor Fault / Speed Feedback Error
E16
The furnace displays E16, sometimes accompanied by water around the base of the unit.
Condensate Drain Fault
E17
The furnace displays E17 and shuts down, often during very cold or very hot ambient conditions.
Ambient Temperature Sensor Fault
E18
Furnace displays E18, no response to the thermostat, sometimes after a lightning strike or power surge.
Control Transformer / Low-Voltage Power Fault
E19
Furnace displays E19, exhibiting intermittent operation and random resets.
Power Supply / Brownout Detection
E20
Furnace displays E20, often associated with the integrated domestic hot water (DHW) function on combi models.
DHW Priority / Flow Sensor Fault (Combi Furnace)
Symptom
Furnace emits a chemical or plastic smell during operation.
Contaminant Combustion / Component Overheating
Symptom
Furnace starts but shuts down after a few seconds; the blower does not come on.
Ignition or Flame Proving Failure Without Displayed Code
Symptom
Furnace will not start at all; no lights, no display, no fan operation.
No Power to Furnace
Symptom
The blower runs continuously even when the thermostat is not calling for heat.
Stuck Fan Operation
Symptom
The furnace emits a burning smell when running, especially at the beginning of the season.
Dust Burn-Off / Overheating Components
Symptom
The furnace frequently trips the high limit, but no error code is displayed; the unit is very hot to the touch.
Chronic Overheating
Symptom
The furnace inducer motor runs continuously, but the burners do not light and no code is shown.
Stuck Call for Heat / Pressure Switch Issue
Symptom
The furnace is very noisy during operation, with loud rumbling, whistling, or roaring sounds.
Combustion or Airflow Noise
Symptom
The furnace leaks water around its base or inside the cabinet.
Condensate Leakage
Symptom
The furnace makes a loud banging or booming noise at startup.
Delayed Ignition
Symptom
The furnace occasionally smells of exhaust or flue gases inside the home.
Flue Gas Spillage / Venting Problem
Symptom
The furnace runs but produces no heat; the blower operates, but the supply air is cool or only slightly warm.
Burners Not Firing / No Flame with Blower Operation
Symptom
The furnace runs, but energy bills are unusually high and the unit cycles more often than expected.
Reduced Efficiency / Poor Combustion
Symptom
The furnace runs, but some rooms are too cold while others are too warm.
Air Distribution / Balancing Problem
Symptom
The furnace short cycles: it starts, runs for a few minutes, then shuts off and restarts frequently.
Short Cycling Due to Overheat or Sizing Issues
Symptom
The furnace starts and stops repeatedly without reaching the set temperature; the thermostat clicks frequently.
Thermostat or Control Cycling Issue
Symptom
The furnace vibrates excessively, causing rattling in the cabinet and ductwork.
Mechanical Vibration / Imbalance
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Furnace does not start, no burner ignition, and the control panel shows E01 shortly after a call for heat.
|
Ignition Failure Lockout | View Details |
| E02 |
The furnace attempts to start but shuts down quickly, the control shows E02, and there is no sustained flame.
|
Flame Detection Failure | View Details |
| E03 |
The furnace will not start, the inducer fan does not run, and the display shows E03 shortly after a heat call.
|
Inducer Fan Failure / Pressure Switch Not Proving | View Details |
| E04 |
The furnace starts, the inducer runs, but the burners do not light, and E04 is displayed.
|
Gas Valve or Gas Supply Fault | View Details |
| E05 |
The furnace shuts down during operation, the control shows E05, and the blower may continue to run.
|
High Limit Switch Open / Overheat Condition | View Details |
| E06 |
The furnace stops and displays E06, often after several failed ignition attempts or erratic operation.
|
Control Board Communication / Internal Fault | View Details |
| E07 |
The furnace locks out with E07, often accompanied by a strong draft or wind noise in the vent system.
|
Flue Gas / Draft Fault | View Details |
| E08 |
The furnace displays E08 and does not respond to thermostat commands.
|
Thermostat / Low-Voltage Control Fault | View Details |
| E09 |
The furnace displays E09 and shuts down, often after running for a short period.
|
Rollout Switch Tripped | View Details |
| E10 |
The furnace displays E10; the blower may run continuously, but there is no heat output.
|
Supply Air Temperature Sensor Fault | View Details |
| E11 |
The furnace displays E11 and will not start, often after a power outage or wiring work.
|
Polarity / Grounding Error | View Details |
| E12 |
The furnace displays E12, runs briefly, then shuts down with no heat reaching the home.
|
Return Air Temperature Sensor Fault | View Details |
| E13 |
The furnace displays E13 and will not ignite, often in very cold conditions.
|
Low Gas Pressure / Gas Supply Fault | View Details |
| E14 |
The furnace displays E14; the blower may run, but the burners do not light.
|
Ignition Lockout Due to Repeated Failures | View Details |
| E15 |
The furnace displays E15 and stops, often during blower operation changes.
|
Blower Motor Fault / Speed Feedback Error | View Details |
| E16 |
The furnace displays E16, sometimes accompanied by water around the base of the unit.
|
Condensate Drain Fault | View Details |
| E17 |
The furnace displays E17 and shuts down, often during very cold or very hot ambient conditions.
|
Ambient Temperature Sensor Fault | View Details |
| E18 |
Furnace displays E18, no response to the thermostat, sometimes after a lightning strike or power surge.
|
Control Transformer / Low-Voltage Power Fault | View Details |
| E19 |
Furnace displays E19, exhibiting intermittent operation and random resets.
|
Power Supply / Brownout Detection | View Details |
| E20 |
Furnace displays E20, often associated with the integrated domestic hot water (DHW) function on combi models.
|
DHW Priority / Flow Sensor Fault (Combi Furnace) | View Details |
| – |
Furnace emits a chemical or plastic smell during operation.
|
Contaminant Combustion / Component Overheating | View Details |
| – |
Furnace starts but shuts down after a few seconds; the blower does not come on.
|
Ignition or Flame Proving Failure Without Displayed Code | View Details |
| – |
Furnace will not start at all; no lights, no display, no fan operation.
|
No Power to Furnace | View Details |
| – |
The blower runs continuously even when the thermostat is not calling for heat.
|
Stuck Fan Operation | View Details |
| – |
The furnace emits a burning smell when running, especially at the beginning of the season.
|
Dust Burn-Off / Overheating Components | View Details |
| – |
The furnace frequently trips the high limit, but no error code is displayed; the unit is very hot to the touch.
|
Chronic Overheating | View Details |
| – |
The furnace inducer motor runs continuously, but the burners do not light and no code is shown.
|
Stuck Call for Heat / Pressure Switch Issue | View Details |
| – |
The furnace is very noisy during operation, with loud rumbling, whistling, or roaring sounds.
|
Combustion or Airflow Noise | View Details |
| – |
The furnace leaks water around its base or inside the cabinet.
|
Condensate Leakage | View Details |
| – |
The furnace makes a loud banging or booming noise at startup.
|
Delayed Ignition | View Details |
| – |
The furnace occasionally smells of exhaust or flue gases inside the home.
|
Flue Gas Spillage / Venting Problem | View Details |
| – |
The furnace runs but produces no heat; the blower operates, but the supply air is cool or only slightly warm.
|
Burners Not Firing / No Flame with Blower Operation | View Details |
| – |
The furnace runs, but energy bills are unusually high and the unit cycles more often than expected.
|
Reduced Efficiency / Poor Combustion | View Details |
| – |
The furnace runs, but some rooms are too cold while others are too warm.
|
Air Distribution / Balancing Problem | View Details |
| – |
The furnace short cycles: it starts, runs for a few minutes, then shuts off and restarts frequently.
|
Short Cycling Due to Overheat or Sizing Issues | View Details |
| – |
The furnace starts and stops repeatedly without reaching the set temperature; the thermostat clicks frequently.
|
Thermostat or Control Cycling Issue | View Details |
| – |
The furnace vibrates excessively, causing rattling in the cabinet and ductwork.
|
Mechanical Vibration / Imbalance | View Details |
No matching codes found
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