Biasi
Biasi Water Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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01
Water heater does not ignite; display shows error 01 shortly after a call for hot water or heating.
Ignition Failure / No Flame Detected
02
Water heater locks out with error 02; burner lights briefly then shuts down.
Flame Loss During Operation
03
The display shows error 03, and the water heater will not start; the fan may not run.
Flue Gas / Fan Fault
04
Error 04 is displayed; the water heater shuts down shortly after starting, often accompanied by gurgling noises.
Flue Gas Overheat / High Limit Tripped
05
Error 05 is displayed; the appliance does not fire and may show a fan pre-purge attempt.
Air Pressure Switch Fault
06
Error 06 is displayed; the water temperature rises rapidly, and the unit shuts down due to overheating.
Primary Flow NTC Sensor Fault / Overheat
07
Error 07; the unit may start then quickly shut down, or it may not start at all.
Return NTC Sensor Fault
08
Error 08; the water heater does not respond to hot water demand or heating requests.
Flow Switch / Flow Sensor Fault
09
Error 09; the appliance locks out and may show abnormal temperature readings.
Domestic Hot Water (DHW) NTC Sensor Fault
10
Error 10; the unit will not start and may show no fan or ignition sequence.
Low Water Pressure / No System Pressure
11
Error 11; the water heater intermittently shuts down, often when hot water demand is high.
Overheat Thermostat Trip
12
Error 12; the display may show abnormal temperature readings or fluctuate rapidly.
Flow/Return NTC Sensor Short Circuit
13
Error 13; the display may show very low or unrealistic temperature values.
Flow/Return NTC Sensor Open Circuit
14
Error 14; the unit may not respond to thermostat or control signals.
Room Thermostat / External Control Fault
15
Error 15; the display may be blank or show erratic characters, and the heater may be unresponsive.
Control Board Communication / PCB Fault
16
Error 16; the fan runs but ignition does not occur, or ignition is delayed.
Gas Valve Control Fault
17
Error 17; the heater cycles rapidly on and off, or fails to modulate correctly.
Modulation / Gas Valve Feedback Fault
18
Error 18; the heater may start but then shuts down with a fan-related fault.
Fan Speed / Tachometer Fault
19
Error 19; the heater may lock out after a power interruption or surge.
EEPROM / Configuration Error
20
Error 20; the heater will not start and indicates a condensate or flue-related fault.
Condensate Drain / Blockage Fault
Symptom
Condensate water drips from joints or inside the heater instead of the condensate pipe.
Condensate Leakage
Symptom
Hot water is scalding hot even at low tap flow, or temperature overshoots setpoint.
Overheating DHW / Poor Temperature Control
Symptom
Radiators or connected heating circuit do not get hot, but the water heater appears to run.
No Heating Output / Poor Circulation
Symptom
The water heater does not start at all; there are no lights or display, it is completely dead.
No Power / Electrical Supply Failure
Symptom
The water heater runs, but the hot water temperature fluctuates or is not hot enough at the taps.
Inadequate DHW Temperature / Temperature Fluctuation
Symptom
Water heater emits a burning smell or signs of overheating plastic components.
Overheating / Electrical Overload
Symptom
Water heater fan runs but burner does not ignite; no error code displayed.
Ignition Sequence Interruption
Symptom
Water heater flue terminal shows signs of sooting or black deposits.
Poor Combustion / Sooting
Symptom
Water heater frequently locks out and requires manual reset, with no consistent error code.
Intermittent Lockout / Unstable Operation
Symptom
Water heater frequently loses pressure and needs topping up.
Chronic Pressure Loss
Symptom
Water heater frequently short cycles, turning on and off rapidly.
Short Cycling / Oversized Output
Symptom
Water heater ignites with a loud bang or popping noise.
Delayed Ignition / Hard Light-Off
Symptom
Water heater is leaking water from the bottom or inside the casing.
Internal Water Leak
Symptom
Water heater makes loud humming, grinding, or rattling noises during operation.
Mechanical Noise / Vibration
Symptom
Water heater produces no hot water, but heating (if present) works normally.
No Domestic Hot Water Production
Symptom
Water heater trips the household RCD or blows fuses when starting.
Electrical Short / Earth Leakage
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| 01 |
Water heater does not ignite; display shows error 01 shortly after a call for hot water or heating.
|
Ignition Failure / No Flame Detected | View Details |
| 02 |
Water heater locks out with error 02; burner lights briefly then shuts down.
|
Flame Loss During Operation | View Details |
| 03 |
The display shows error 03, and the water heater will not start; the fan may not run.
|
Flue Gas / Fan Fault | View Details |
| 04 |
Error 04 is displayed; the water heater shuts down shortly after starting, often accompanied by gurgling noises.
|
Flue Gas Overheat / High Limit Tripped | View Details |
| 05 |
Error 05 is displayed; the appliance does not fire and may show a fan pre-purge attempt.
|
Air Pressure Switch Fault | View Details |
| 06 |
Error 06 is displayed; the water temperature rises rapidly, and the unit shuts down due to overheating.
|
Primary Flow NTC Sensor Fault / Overheat | View Details |
| 07 |
Error 07; the unit may start then quickly shut down, or it may not start at all.
|
Return NTC Sensor Fault | View Details |
| 08 |
Error 08; the water heater does not respond to hot water demand or heating requests.
|
Flow Switch / Flow Sensor Fault | View Details |
| 09 |
Error 09; the appliance locks out and may show abnormal temperature readings.
|
Domestic Hot Water (DHW) NTC Sensor Fault | View Details |
| 10 |
Error 10; the unit will not start and may show no fan or ignition sequence.
|
Low Water Pressure / No System Pressure | View Details |
| 11 |
Error 11; the water heater intermittently shuts down, often when hot water demand is high.
|
Overheat Thermostat Trip | View Details |
| 12 |
Error 12; the display may show abnormal temperature readings or fluctuate rapidly.
|
Flow/Return NTC Sensor Short Circuit | View Details |
| 13 |
Error 13; the display may show very low or unrealistic temperature values.
|
Flow/Return NTC Sensor Open Circuit | View Details |
| 14 |
Error 14; the unit may not respond to thermostat or control signals.
|
Room Thermostat / External Control Fault | View Details |
| 15 |
Error 15; the display may be blank or show erratic characters, and the heater may be unresponsive.
|
Control Board Communication / PCB Fault | View Details |
| 16 |
Error 16; the fan runs but ignition does not occur, or ignition is delayed.
|
Gas Valve Control Fault | View Details |
| 17 |
Error 17; the heater cycles rapidly on and off, or fails to modulate correctly.
|
Modulation / Gas Valve Feedback Fault | View Details |
| 18 |
Error 18; the heater may start but then shuts down with a fan-related fault.
|
Fan Speed / Tachometer Fault | View Details |
| 19 |
Error 19; the heater may lock out after a power interruption or surge.
|
EEPROM / Configuration Error | View Details |
| 20 |
Error 20; the heater will not start and indicates a condensate or flue-related fault.
|
Condensate Drain / Blockage Fault | View Details |
| – |
Condensate water drips from joints or inside the heater instead of the condensate pipe.
|
Condensate Leakage | View Details |
| – |
Hot water is scalding hot even at low tap flow, or temperature overshoots setpoint.
|
Overheating DHW / Poor Temperature Control | View Details |
| – |
Radiators or connected heating circuit do not get hot, but the water heater appears to run.
|
No Heating Output / Poor Circulation | View Details |
| – |
The water heater does not start at all; there are no lights or display, it is completely dead.
|
No Power / Electrical Supply Failure | View Details |
| – |
The water heater runs, but the hot water temperature fluctuates or is not hot enough at the taps.
|
Inadequate DHW Temperature / Temperature Fluctuation | View Details |
| – |
Water heater emits a burning smell or signs of overheating plastic components.
|
Overheating / Electrical Overload | View Details |
| – |
Water heater fan runs but burner does not ignite; no error code displayed.
|
Ignition Sequence Interruption | View Details |
| – |
Water heater flue terminal shows signs of sooting or black deposits.
|
Poor Combustion / Sooting | View Details |
| – |
Water heater frequently locks out and requires manual reset, with no consistent error code.
|
Intermittent Lockout / Unstable Operation | View Details |
| – |
Water heater frequently loses pressure and needs topping up.
|
Chronic Pressure Loss | View Details |
| – |
Water heater frequently short cycles, turning on and off rapidly.
|
Short Cycling / Oversized Output | View Details |
| – |
Water heater ignites with a loud bang or popping noise.
|
Delayed Ignition / Hard Light-Off | View Details |
| – |
Water heater is leaking water from the bottom or inside the casing.
|
Internal Water Leak | View Details |
| – |
Water heater makes loud humming, grinding, or rattling noises during operation.
|
Mechanical Noise / Vibration | View Details |
| – |
Water heater produces no hot water, but heating (if present) works normally.
|
No Domestic Hot Water Production | View Details |
| – |
Water heater trips the household RCD or blows fuses when starting.
|
Electrical Short / Earth Leakage | View Details |
No matching codes found
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