US Stove
US Stove Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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Er1
Control board displays Er1 and furnace will not start or feed pellets/coal.
Exhaust Temperature Sensor Open or Shorted
Er10
Control board displays Er10 and furnace will not respond to keypad inputs.
Keypad or User Interface Communication Fault
Er11
Display shows Er11 and furnace shuts down; may occur during normal operation.
Convection (Room) Blower Failure or Feedback Fault
Er12
Furnace displays Er12 and will not start; may occur after a power surge or outage.
Control Board Internal Fault or Memory Error
Er13
Display shows Er13 and furnace shuts down; may be accompanied by unusual fan behavior.
Combustion Blower Speed or Feedback Error
Er14
Furnace shows Er14 and stops; may occur when switching operating modes or adjusting settings.
Mode or Configuration Error
Er15
Display shows Er15 and furnace will not respond to thermostat calls.
Thermostat Input Fault
Er2
Display shows Er2 and furnace shuts down or will not ignite.
Room Temperature Sensor Open or Shorted
Er3
Furnace displays Er3 and stops feeding fuel; combustion blower may continue to run.
High Limit Switch Open (Overheat Condition)
Er4
Control panel shows Er4 and furnace shuts down or will not start a new cycle.
Low Limit / Proof-of-Fire Switch Not Closing
Er5
Display shows Er5 and the furnace stops feeding fuel; combustion blower may continue to run for cool-down.
Vacuum Switch Open (Loss of Draft or Door Open)
Er6
Control board displays Er6 and furnace will not start or shuts down unexpectedly.
Hopper Lid or Door Safety Switch Open
Er7
Display shows Er7 and the furnace stops; auger does not feed.
Auger Motor Overload or Jam Detected
Er8
Furnace displays Er8 and shuts down; no ignition or incomplete startup.
Igniter Failure or Ignition Timeout
Er9
Display shows Er9 and furnace stops; blowers may continue for cool-down.
Flue Over-Temperature or Exhaust High Limit Trip
Symptom
Combustion blower runs continuously even when furnace is off and cool.
Stuck Combustion Blower Relay or Control Logic Fault
Symptom
Control panel lights flicker or display resets when blowers start.
Voltage Drop or Electrical Interference
Symptom
Furnace control panel buttons are unresponsive or require very hard presses.
Worn or Contaminated Keypad
Symptom
Furnace display is blank or unreadable, but blowers or auger still run.
Display or User Interface Failure
Symptom
Furnace flame is very small and tends to go out, even though fuel is feeding.
Lean Combustion / Excess Air or Low Fuel
Symptom
Furnace frequently clogs with clinkers or hard deposits in the burn pot.
Excessive Clinker Formation
Symptom
Furnace frequently runs out of fuel in the burn pot even though the hopper is full.
Inconsistent Fuel Feed
Symptom
Furnace frequently trips the high limit and shuts down on hot days or when ducts are closed.
Overheating Due to Restricted Airflow
Symptom
Furnace ignites but produces a lazy, dark orange flame with heavy soot.
Rich Combustion / Insufficient Air
Symptom
Furnace is excessively noisy during operation; rattling, grinding, or squealing sounds.
Mechanical Noise from Blowers or Auger
Symptom
Furnace leaks water or condensation around the base or vent connection.
Condensation or Water Ingress
Symptom
Furnace lights but then goes out after a few minutes; repeats short cycling.
Loss of Proof-of-Fire or Poor Combustion
Symptom
Furnace operates but carbon monoxide detector in home alarms during use.
Incomplete Combustion or Venting Problem
Symptom
Furnace powers up but will not feed pellets/coal; auger never turns.
Auger Feed System Failure
Symptom
Furnace runs but produces very little heat; house does not warm up.
Low Heat Output / Underfiring
Symptom
Furnace runs but room blower never comes on; cabinet becomes very hot.
Convection Blower Not Starting
Symptom
Furnace runs continuously and overheats the house; does not shut off when thermostat is satisfied.
Thermostat Control Failure
Symptom
Furnace shuts down randomly during operation without displaying an error code.
Intermittent Safety Switch or Power Interruption
Symptom
Furnace starts and runs but shuts down when the hopper is half full or more.
Hopper Lid or Level Safety Interaction
Symptom
Furnace vibrates excessively or rattles the ductwork during operation.
Excessive Vibration / Imbalanced Blower
Symptom
Furnace will not start at all; no lights on control panel and no fans run.
No Power to Furnace
Symptom
Smoke leaks into the room when the furnace starts or during operation.
Flue Gas Leakage / Poor Draft
Symptom
Strong smoke or burning odor from furnace or vents without visible smoke in room.
Overheating Components or Residual Manufacturing Oils
Symptom
Thermostat calls for heat but furnace does not start; control panel appears normal.
No Response to Heat Call
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| Er1 |
Control board displays Er1 and furnace will not start or feed pellets/coal.
|
Exhaust Temperature Sensor Open or Shorted | View Details |
| Er10 |
Control board displays Er10 and furnace will not respond to keypad inputs.
|
Keypad or User Interface Communication Fault | View Details |
| Er11 |
Display shows Er11 and furnace shuts down; may occur during normal operation.
|
Convection (Room) Blower Failure or Feedback Fault | View Details |
| Er12 |
Furnace displays Er12 and will not start; may occur after a power surge or outage.
|
Control Board Internal Fault or Memory Error | View Details |
| Er13 |
Display shows Er13 and furnace shuts down; may be accompanied by unusual fan behavior.
|
Combustion Blower Speed or Feedback Error | View Details |
| Er14 |
Furnace shows Er14 and stops; may occur when switching operating modes or adjusting settings.
|
Mode or Configuration Error | View Details |
| Er15 |
Display shows Er15 and furnace will not respond to thermostat calls.
|
Thermostat Input Fault | View Details |
| Er2 |
Display shows Er2 and furnace shuts down or will not ignite.
|
Room Temperature Sensor Open or Shorted | View Details |
| Er3 |
Furnace displays Er3 and stops feeding fuel; combustion blower may continue to run.
|
High Limit Switch Open (Overheat Condition) | View Details |
| Er4 |
Control panel shows Er4 and furnace shuts down or will not start a new cycle.
|
Low Limit / Proof-of-Fire Switch Not Closing | View Details |
| Er5 |
Display shows Er5 and the furnace stops feeding fuel; combustion blower may continue to run for cool-down.
|
Vacuum Switch Open (Loss of Draft or Door Open) | View Details |
| Er6 |
Control board displays Er6 and furnace will not start or shuts down unexpectedly.
|
Hopper Lid or Door Safety Switch Open | View Details |
| Er7 |
Display shows Er7 and the furnace stops; auger does not feed.
|
Auger Motor Overload or Jam Detected | View Details |
| Er8 |
Furnace displays Er8 and shuts down; no ignition or incomplete startup.
|
Igniter Failure or Ignition Timeout | View Details |
| Er9 |
Display shows Er9 and furnace stops; blowers may continue for cool-down.
|
Flue Over-Temperature or Exhaust High Limit Trip | View Details |
| – |
Combustion blower runs continuously even when furnace is off and cool.
|
Stuck Combustion Blower Relay or Control Logic Fault | View Details |
| – |
Control panel lights flicker or display resets when blowers start.
|
Voltage Drop or Electrical Interference | View Details |
| – |
Furnace control panel buttons are unresponsive or require very hard presses.
|
Worn or Contaminated Keypad | View Details |
| – |
Furnace display is blank or unreadable, but blowers or auger still run.
|
Display or User Interface Failure | View Details |
| – |
Furnace flame is very small and tends to go out, even though fuel is feeding.
|
Lean Combustion / Excess Air or Low Fuel | View Details |
| – |
Furnace frequently clogs with clinkers or hard deposits in the burn pot.
|
Excessive Clinker Formation | View Details |
| – |
Furnace frequently runs out of fuel in the burn pot even though the hopper is full.
|
Inconsistent Fuel Feed | View Details |
| – |
Furnace frequently trips the high limit and shuts down on hot days or when ducts are closed.
|
Overheating Due to Restricted Airflow | View Details |
| – |
Furnace ignites but produces a lazy, dark orange flame with heavy soot.
|
Rich Combustion / Insufficient Air | View Details |
| – |
Furnace is excessively noisy during operation; rattling, grinding, or squealing sounds.
|
Mechanical Noise from Blowers or Auger | View Details |
| – |
Furnace leaks water or condensation around the base or vent connection.
|
Condensation or Water Ingress | View Details |
| – |
Furnace lights but then goes out after a few minutes; repeats short cycling.
|
Loss of Proof-of-Fire or Poor Combustion | View Details |
| – |
Furnace operates but carbon monoxide detector in home alarms during use.
|
Incomplete Combustion or Venting Problem | View Details |
| – |
Furnace powers up but will not feed pellets/coal; auger never turns.
|
Auger Feed System Failure | View Details |
| – |
Furnace runs but produces very little heat; house does not warm up.
|
Low Heat Output / Underfiring | View Details |
| – |
Furnace runs but room blower never comes on; cabinet becomes very hot.
|
Convection Blower Not Starting | View Details |
| – |
Furnace runs continuously and overheats the house; does not shut off when thermostat is satisfied.
|
Thermostat Control Failure | View Details |
| – |
Furnace shuts down randomly during operation without displaying an error code.
|
Intermittent Safety Switch or Power Interruption | View Details |
| – |
Furnace starts and runs but shuts down when the hopper is half full or more.
|
Hopper Lid or Level Safety Interaction | View Details |
| – |
Furnace vibrates excessively or rattles the ductwork during operation.
|
Excessive Vibration / Imbalanced Blower | View Details |
| – |
Furnace will not start at all; no lights on control panel and no fans run.
|
No Power to Furnace | View Details |
| – |
Smoke leaks into the room when the furnace starts or during operation.
|
Flue Gas Leakage / Poor Draft | View Details |
| – |
Strong smoke or burning odor from furnace or vents without visible smoke in room.
|
Overheating Components or Residual Manufacturing Oils | View Details |
| – |
Thermostat calls for heat but furnace does not start; control panel appears normal.
|
No Response to Heat Call | View Details |
No matching codes found
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