Viadrus
Viadrus 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
The furnace does not ignite, the burner does not start, and the control shows E01 shortly after a call for heat.
Ignition Failure / No Flame Establishment
E02
The furnace starts the ignition sequence but shuts down with E02, indicating that the flame is not detected or is lost shortly after ignition.
Flame Detection Failure
E03
The furnace attempts to start but locks out with E03; the fan may run briefly, with no ignition, often accompanied by a flue or air pressure warning icon.
Flue Gas Fan / Air Pressure Switch Fault
E04
The control displays E04 and the furnace shuts down; this often occurs after overheating or poor circulation, with the heat exchanger being very hot to the touch.
Overheat / Safety Thermostat Tripped
E05
The display shows E05 and the furnace will not start; this is often associated with a sensor icon or an abnormal temperature reading.
Flow Temperature Sensor Fault (NTC Open/Short)
E06
The furnace locks out with E06; domestic hot water (if equipped) overheats or is cold, and temperature readings fluctuate.
Return or DHW Temperature Sensor Fault
E07
The control shows E07 and the burner does not start; this may occur immediately on power‑up.
Low System Water Pressure / Pressure Switch Open
E08
Furnace displays E08 and shuts down; this may be accompanied by a rapid temperature rise on the display.
Flow Temperature Too High / Overtemperature Cut-Out
E09
The furnace displays E09, the burner stops, and the flue gas temperature is abnormally high.
Flue Gas Temperature Sensor Fault / Overtemperature
E10
The control indicates E10, the burner stops, and the display may show a symbol for an external thermostat or safety loop.
External Safety Circuit Open (Limit Chain / Thermostat Loop)
E11
The furnace displays E11 and remains locked out; there is no response to the thermostat, often after a power surge or wiring work.
Internal Control Board Fault / EEPROM Error
E12
The display shows E12, the burner stops, and the circulation pump may continue to run.
Return Temperature Too Low / Condensation Protection
E13
The furnace indicates E13, the burner stops, and there may be evidence of water around the base of the unit.
Water Leak / Low-Water Cutoff Activation
E14
The control shows E14, the burner does not start, and the gas valve does not click during ignition attempts.
Gas Valve Control Fault
E15
The furnace displays E15, the burner stops, and the fan may continue to run for a purge period.
Flame Loss During Operation
E16
The display shows E16, there is no burner operation, and the fan may not start.
Fan Speed / Tachometer Fault
E17
The furnace indicates E17, the burner stops, and the system may show signs of electrical interference or unstable operation.
Mains Voltage Out of Range
E18
Control shows E18, the burner does not start, and the display may show a communication or bus symbol.
Communication Error Between Control Modules
Symptom
Black soot deposits are present around the flue outlet and on the heat exchanger surfaces, with dark smoke emanating from the chimney.
Sooting / Incomplete Combustion
Symptom
Corrosion and rust visible on the lower sections of the Viadrus cast‑iron furnace, with occasional water drops.
Condensation Corrosion / Low Return Temperature Damage
Symptom
Furnace display is blank or unreadable, but the burner and pump still operate.
Display Module Failure
Symptom
Furnace fan runs continuously even when there is no call for heat and the burner is off.
Fan Stuck On / Control Relay Fault
Symptom
Furnace ignites with a loud bang or pop, sometimes shaking the flue or burner door.
Delayed Ignition
Symptom
Furnace runs but domestic hot water from the indirect cylinder is not hot enough or runs out quickly (on Viadrus systems with DHW cylinder).
Insufficient DHW Heating
Symptom
Furnace shuts down randomly without an error code, then restarts after a while.
Intermittent Overheat or Electrical Interruption
Symptom
Radiators on upper floors are cold while lower ones heat normally when the Viadrus furnace is running.
Air Lock / Insufficient Head
Symptom
Room temperature overshoots the thermostat setting by several degrees before the Viadrus furnace shuts off.
Overheating / Control Overshoot
Symptom
The furnace and nearby pipework vibrate excessively, with a humming or droning noise during operation.
Vibration / Resonance in Burner or Pump
Symptom
The furnace emits a strong smell of gas near the burner compartment, especially during or after ignition attempts.
Gas Leak or Incomplete Ignition
Symptom
The furnace emits a strong smell of oil or visible oil mist around the burner (for Viadrus oil-fired models).
Oil Leak or Poor Combustion
Symptom
The furnace frequently short-cycles (turns on and off rapidly) without maintaining a stable room temperature.
Short Cycling / Control Misconfiguration
Symptom
The furnace makes loud banging or knocking noises when starting or stopping, sometimes referred to as water hammer or kettling.
Kettling / Boiling in Heat Exchanger
Symptom
The furnace runs, but radiators remain cold or only lukewarm, and the burner cycles frequently.
Insufficient Heat Output / Poor Circulation
Symptom
The furnace will not start at all; there are no lights on the control panel, it is completely dead.
No Power to Furnace
Symptom
Water is leaking from the safety (pressure relief) valve discharge pipe near the Viadrus furnace.
Overpressure / Safety Valve Discharge
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
The furnace does not ignite, the burner does not start, and the control shows E01 shortly after a call for heat.
|
Ignition Failure / No Flame Establishment | View Details |
| E02 |
The furnace starts the ignition sequence but shuts down with E02, indicating that the flame is not detected or is lost shortly after ignition.
|
Flame Detection Failure | View Details |
| E03 |
The furnace attempts to start but locks out with E03; the fan may run briefly, with no ignition, often accompanied by a flue or air pressure warning icon.
|
Flue Gas Fan / Air Pressure Switch Fault | View Details |
| E04 |
The control displays E04 and the furnace shuts down; this often occurs after overheating or poor circulation, with the heat exchanger being very hot to the touch.
|
Overheat / Safety Thermostat Tripped | View Details |
| E05 |
The display shows E05 and the furnace will not start; this is often associated with a sensor icon or an abnormal temperature reading.
|
Flow Temperature Sensor Fault (NTC Open/Short) | View Details |
| E06 |
The furnace locks out with E06; domestic hot water (if equipped) overheats or is cold, and temperature readings fluctuate.
|
Return or DHW Temperature Sensor Fault | View Details |
| E07 |
The control shows E07 and the burner does not start; this may occur immediately on power‑up.
|
Low System Water Pressure / Pressure Switch Open | View Details |
| E08 |
Furnace displays E08 and shuts down; this may be accompanied by a rapid temperature rise on the display.
|
Flow Temperature Too High / Overtemperature Cut-Out | View Details |
| E09 |
The furnace displays E09, the burner stops, and the flue gas temperature is abnormally high.
|
Flue Gas Temperature Sensor Fault / Overtemperature | View Details |
| E10 |
The control indicates E10, the burner stops, and the display may show a symbol for an external thermostat or safety loop.
|
External Safety Circuit Open (Limit Chain / Thermostat Loop) | View Details |
| E11 |
The furnace displays E11 and remains locked out; there is no response to the thermostat, often after a power surge or wiring work.
|
Internal Control Board Fault / EEPROM Error | View Details |
| E12 |
The display shows E12, the burner stops, and the circulation pump may continue to run.
|
Return Temperature Too Low / Condensation Protection | View Details |
| E13 |
The furnace indicates E13, the burner stops, and there may be evidence of water around the base of the unit.
|
Water Leak / Low-Water Cutoff Activation | View Details |
| E14 |
The control shows E14, the burner does not start, and the gas valve does not click during ignition attempts.
|
Gas Valve Control Fault | View Details |
| E15 |
The furnace displays E15, the burner stops, and the fan may continue to run for a purge period.
|
Flame Loss During Operation | View Details |
| E16 |
The display shows E16, there is no burner operation, and the fan may not start.
|
Fan Speed / Tachometer Fault | View Details |
| E17 |
The furnace indicates E17, the burner stops, and the system may show signs of electrical interference or unstable operation.
|
Mains Voltage Out of Range | View Details |
| E18 |
Control shows E18, the burner does not start, and the display may show a communication or bus symbol.
|
Communication Error Between Control Modules | View Details |
| – |
Black soot deposits are present around the flue outlet and on the heat exchanger surfaces, with dark smoke emanating from the chimney.
|
Sooting / Incomplete Combustion | View Details |
| – |
Corrosion and rust visible on the lower sections of the Viadrus cast‑iron furnace, with occasional water drops.
|
Condensation Corrosion / Low Return Temperature Damage | View Details |
| – |
Furnace display is blank or unreadable, but the burner and pump still operate.
|
Display Module Failure | View Details |
| – |
Furnace fan runs continuously even when there is no call for heat and the burner is off.
|
Fan Stuck On / Control Relay Fault | View Details |
| – |
Furnace ignites with a loud bang or pop, sometimes shaking the flue or burner door.
|
Delayed Ignition | View Details |
| – |
Furnace runs but domestic hot water from the indirect cylinder is not hot enough or runs out quickly (on Viadrus systems with DHW cylinder).
|
Insufficient DHW Heating | View Details |
| – |
Furnace shuts down randomly without an error code, then restarts after a while.
|
Intermittent Overheat or Electrical Interruption | View Details |
| – |
Radiators on upper floors are cold while lower ones heat normally when the Viadrus furnace is running.
|
Air Lock / Insufficient Head | View Details |
| – |
Room temperature overshoots the thermostat setting by several degrees before the Viadrus furnace shuts off.
|
Overheating / Control Overshoot | View Details |
| – |
The furnace and nearby pipework vibrate excessively, with a humming or droning noise during operation.
|
Vibration / Resonance in Burner or Pump | View Details |
| – |
The furnace emits a strong smell of gas near the burner compartment, especially during or after ignition attempts.
|
Gas Leak or Incomplete Ignition | View Details |
| – |
The furnace emits a strong smell of oil or visible oil mist around the burner (for Viadrus oil-fired models).
|
Oil Leak or Poor Combustion | View Details |
| – |
The furnace frequently short-cycles (turns on and off rapidly) without maintaining a stable room temperature.
|
Short Cycling / Control Misconfiguration | View Details |
| – |
The furnace makes loud banging or knocking noises when starting or stopping, sometimes referred to as water hammer or kettling.
|
Kettling / Boiling in Heat Exchanger | View Details |
| – |
The furnace runs, but radiators remain cold or only lukewarm, and the burner cycles frequently.
|
Insufficient Heat Output / Poor Circulation | View Details |
| – |
The furnace will not start at all; there are no lights on the control panel, it is completely dead.
|
No Power to Furnace | View Details |
| – |
Water is leaking from the safety (pressure relief) valve discharge pipe near the Viadrus furnace.
|
Overpressure / Safety Valve Discharge | View Details |
No matching codes found
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