Dettson
Dettson Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E1
Dettson furnace will not start; control board shows E1 and the inducer motor never comes on.
Pressure Switch Failed to Close
E10
Dettson furnace shows E10; unit may start but shuts down quickly or will not respond to thermostat.
Communication Error Between Control Modules
E11
Dettson furnace displays E11; blower may run at low speed continuously without heating.
Supply Air Temperature Sensor Fault
E12
Dettson furnace shows E12 and shuts down; may occur during long heating cycles.
Return Air Temperature Sensor Fault
E13
Dettson furnace displays E13; unit may short-cycle or not reach set temperature.
Outdoor Temperature Sensor Fault (if equipped)
E14
Dettson furnace shows E14; blower may run at high speed and furnace will not heat.
Blower Motor Fault / ECM Communication Error
E15
Dettson furnace displays E15; unit may lock out after several failed ignition attempts.
Ignition Lockout (Retries Exceeded)
E16
Dettson furnace shows E16; unit may operate but with abnormal fan behavior or intermittent shutdowns.
Line Voltage Polarity / Ground Fault
E17
Dettson furnace displays E17; unit may shut down during operation on very cold days.
Condensate Drain Fault (Condensing Models)
E18
Dettson furnace shows E18; unit may not respond to thermostat changes.
Thermostat Type / Configuration Error
E19
Dettson furnace displays E19; unit may run at reduced capacity or shut down intermittently.
Gas Pressure / Manifold Pressure Fault
E2
Dettson furnace starts inducer, but burners do not light; control board shows E2.
Ignition Failure / No Flame Detected
E20
Dettson furnace shows E20; unit may not start or may shut down unexpectedly.
Door Switch / Safety Interlock Open
E3
Dettson furnace lights briefly then shuts off; control board displays E3 and retries ignition.
Flame Loss / Flame Sense Fault
E4
Dettson furnace inducer starts, but the unit locks out with E4 before ignition; blower may run in cool-down mode.
High Limit Switch Open / Overheat Lockout
E5
Dettson furnace attempts to start but shuts down with E5; inducer may run briefly, then stop.
Rollout Switch Open / Flame Rollout Detected
E6
Dettson furnace control board shows E6; blower may run continuously and furnace will not heat.
Low Voltage / Thermostat Circuit Fault
E7
Dettson furnace displays E7 and will not start a heating cycle; no inducer or blower operation.
Internal Control Board Fault
E8
Dettson furnace shows E8; inducer may start and stop repeatedly without ignition.
Inducer Motor Fault / Draft Failure
E9
Dettson furnace displays E9; blower may run but burners do not light.
Gas Valve Circuit Fault
Symptom
Dettson furnace blower runs constantly, even when there is no call for heat or fan from the thermostat.
Blower Stuck in Continuous Mode
Symptom
Dettson furnace causes strong vibration and rattling noises through the ductwork.
Blower Imbalance / Loose Panels
Symptom
Dettson furnace cycles on and off very frequently (every few minutes) but maintains temperature.
Thermostat / Control Short Cycling
Symptom
Dettson furnace emits a burning smell when it runs.
Dust Burn-Off / Overheating Components
Symptom
Dettson furnace frequently trips the household circuit breaker.
Electrical Overload / Short Circuit
Symptom
Dettson furnace heats but some rooms are much colder than others.
Airflow Imbalance / Duct Issues
Symptom
Dettson furnace leaks water around the base of the unit.
Condensate Leak (Condensing Furnace)
Symptom
Dettson furnace leaks water from the exhaust vent or flue pipe.
Flue Condensation / Venting Issue
Symptom
Dettson furnace makes loud banging or booming noises at startup.
Delayed Ignition / Burner Light-Off Problem
Symptom
Dettson furnace occasionally emits a clicking sound but does not start a heating cycle.
Relay Operation Without Heat Call Completion
Symptom
Dettson furnace occasionally emits a whistling noise from the return or supply grilles.
Airflow Restriction / High Velocity Noise
Symptom
Dettson furnace produces a high-pitched whine or squeal during operation.
Blower or Inducer Mechanical Noise
Symptom
Dettson furnace produces visible soot around the exhaust or on nearby surfaces.
Incomplete Combustion / Sooting
Symptom
Dettson furnace runs but house air feels very dry and uncomfortable in winter.
Low Indoor Humidity (System Interaction)
Symptom
Dettson furnace runs but produces no heat; blower runs continuously with room temperature air.
Burners Not Igniting / No Heat Output
Symptom
Dettson furnace short cycles: starts, runs for a few minutes, then shuts off before reaching thermostat setpoint.
Overheating / High Limit Cycling
Symptom
Dettson furnace starts but shuts off after a few seconds without noticeable heat.
Pressure Switch or Draft Interruption
Symptom
Dettson furnace will not start at all; no lights, no fan, completely dead.
No Power to Furnace
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Dettson furnace will not start; control board shows E1 and the inducer motor never comes on.
|
Pressure Switch Failed to Close | View Details |
| E10 |
Dettson furnace shows E10; unit may start but shuts down quickly or will not respond to thermostat.
|
Communication Error Between Control Modules | View Details |
| E11 |
Dettson furnace displays E11; blower may run at low speed continuously without heating.
|
Supply Air Temperature Sensor Fault | View Details |
| E12 |
Dettson furnace shows E12 and shuts down; may occur during long heating cycles.
|
Return Air Temperature Sensor Fault | View Details |
| E13 |
Dettson furnace displays E13; unit may short-cycle or not reach set temperature.
|
Outdoor Temperature Sensor Fault (if equipped) | View Details |
| E14 |
Dettson furnace shows E14; blower may run at high speed and furnace will not heat.
|
Blower Motor Fault / ECM Communication Error | View Details |
| E15 |
Dettson furnace displays E15; unit may lock out after several failed ignition attempts.
|
Ignition Lockout (Retries Exceeded) | View Details |
| E16 |
Dettson furnace shows E16; unit may operate but with abnormal fan behavior or intermittent shutdowns.
|
Line Voltage Polarity / Ground Fault | View Details |
| E17 |
Dettson furnace displays E17; unit may shut down during operation on very cold days.
|
Condensate Drain Fault (Condensing Models) | View Details |
| E18 |
Dettson furnace shows E18; unit may not respond to thermostat changes.
|
Thermostat Type / Configuration Error | View Details |
| E19 |
Dettson furnace displays E19; unit may run at reduced capacity or shut down intermittently.
|
Gas Pressure / Manifold Pressure Fault | View Details |
| E2 |
Dettson furnace starts inducer, but burners do not light; control board shows E2.
|
Ignition Failure / No Flame Detected | View Details |
| E20 |
Dettson furnace shows E20; unit may not start or may shut down unexpectedly.
|
Door Switch / Safety Interlock Open | View Details |
| E3 |
Dettson furnace lights briefly then shuts off; control board displays E3 and retries ignition.
|
Flame Loss / Flame Sense Fault | View Details |
| E4 |
Dettson furnace inducer starts, but the unit locks out with E4 before ignition; blower may run in cool-down mode.
|
High Limit Switch Open / Overheat Lockout | View Details |
| E5 |
Dettson furnace attempts to start but shuts down with E5; inducer may run briefly, then stop.
|
Rollout Switch Open / Flame Rollout Detected | View Details |
| E6 |
Dettson furnace control board shows E6; blower may run continuously and furnace will not heat.
|
Low Voltage / Thermostat Circuit Fault | View Details |
| E7 |
Dettson furnace displays E7 and will not start a heating cycle; no inducer or blower operation.
|
Internal Control Board Fault | View Details |
| E8 |
Dettson furnace shows E8; inducer may start and stop repeatedly without ignition.
|
Inducer Motor Fault / Draft Failure | View Details |
| E9 |
Dettson furnace displays E9; blower may run but burners do not light.
|
Gas Valve Circuit Fault | View Details |
| – |
Dettson furnace blower runs constantly, even when there is no call for heat or fan from the thermostat.
|
Blower Stuck in Continuous Mode | View Details |
| – |
Dettson furnace causes strong vibration and rattling noises through the ductwork.
|
Blower Imbalance / Loose Panels | View Details |
| – |
Dettson furnace cycles on and off very frequently (every few minutes) but maintains temperature.
|
Thermostat / Control Short Cycling | View Details |
| – |
Dettson furnace emits a burning smell when it runs.
|
Dust Burn-Off / Overheating Components | View Details |
| – |
Dettson furnace frequently trips the household circuit breaker.
|
Electrical Overload / Short Circuit | View Details |
| – |
Dettson furnace heats but some rooms are much colder than others.
|
Airflow Imbalance / Duct Issues | View Details |
| – |
Dettson furnace leaks water around the base of the unit.
|
Condensate Leak (Condensing Furnace) | View Details |
| – |
Dettson furnace leaks water from the exhaust vent or flue pipe.
|
Flue Condensation / Venting Issue | View Details |
| – |
Dettson furnace makes loud banging or booming noises at startup.
|
Delayed Ignition / Burner Light-Off Problem | View Details |
| – |
Dettson furnace occasionally emits a clicking sound but does not start a heating cycle.
|
Relay Operation Without Heat Call Completion | View Details |
| – |
Dettson furnace occasionally emits a whistling noise from the return or supply grilles.
|
Airflow Restriction / High Velocity Noise | View Details |
| – |
Dettson furnace produces a high-pitched whine or squeal during operation.
|
Blower or Inducer Mechanical Noise | View Details |
| – |
Dettson furnace produces visible soot around the exhaust or on nearby surfaces.
|
Incomplete Combustion / Sooting | View Details |
| – |
Dettson furnace runs but house air feels very dry and uncomfortable in winter.
|
Low Indoor Humidity (System Interaction) | View Details |
| – |
Dettson furnace runs but produces no heat; blower runs continuously with room temperature air.
|
Burners Not Igniting / No Heat Output | View Details |
| – |
Dettson furnace short cycles: starts, runs for a few minutes, then shuts off before reaching thermostat setpoint.
|
Overheating / High Limit Cycling | View Details |
| – |
Dettson furnace starts but shuts off after a few seconds without noticeable heat.
|
Pressure Switch or Draft Interruption | View Details |
| – |
Dettson furnace will not start at all; no lights, no fan, completely dead.
|
No Power to Furnace | View Details |
No matching codes found
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