Viessmann Vitola Biferral Fault codes & diagnostics

What to check first

1. Locate the burner reset button on the control panel
2. Press and hold the reset button for 2-3 seconds
3. Wait to see if the burner fires up; if it locks out again, do not continue trying and call a professional

Parts commonly replaced

• Oil nozzle
• Ignition electrodes
• Photocell / Flame sensor
• Fuel pump

Related codes

• 02

What to check first

1. Check if your fuel tank has run out of oil
2. Press the illuminated reset button on the burner control box once
3. Ensure any external fuel valves are fully open

Parts commonly replaced

• Oil nozzle
• Photoelectric cell (Flame sensor)
• Ignition electrodes
• Fuel pump

Parts commonly replaced

• Oil nozzle
• Fuel pump
• Photocell
• Ignition electrodes

What to check first

1. Check that you have enough oil in your storage tank
2. Ensure the oil supply valves are fully open
3. Press the illuminated reset button on the burner control box once

Parts commonly replaced

• Oil nozzle
• Photocell / Flame sensor
• Oil pump
• Ignition electrodes

What to check first

1. Check if your fuel tank has run out of oil
2. Ensure the fuel supply valve is fully open
3. Press the illuminated reset button on the burner controller once

Parts commonly replaced

• Oil nozzle
• Photocell (flame sensor)
• Ignition electrodes
• Fuel pump

Parts commonly replaced

• Oil nozzle
• Ignition electrodes
• Fuel pump
• Photocell sensor

Related codes

• 02

What to check first

1. Check if your fuel supply (oil or gas) is turned on and you have fuel in the tank
2. Press the illuminated 'R' or reset button on the burner control unit once
3. Listen for the burner starting up; if it fails again, do not continue to reset

Parts commonly replaced

• Photocell / Flame sensor
• Ignition electrodes
• Burner control box
• Fuel pump

Parts commonly replaced

• Boiler water temperature sensor
• Circulation pump
• Control unit (PCB)

Parts commonly replaced

• Control Unit (PCB)
• Relay Module

Parts commonly replaced

• Burner control unit
• Ignition electrodes
• Oil pump
• Flame sensor

Parts commonly replaced

• Oil nozzle
• Fuel pump
• Oil filter
• Automatic air vent

What to check first

1. Locate the reset button on the burner control unit (often hidden behind the front cover panel).
2. Press the reset button once firmly.
3. Wait up to two minutes to see if the burner ignites.

Parts commonly replaced

• Burner control unit
• Ignition electrode
• Oil nozzle
• Photocell

What to check first

1. Locate the external filling loop (braided silver hose) under or near the boiler.
2. Slowly open the valves until the pressure gauge on the boiler reads between 1.0 and 1.5 bar.
3. Close both valves tightly and restart the boiler.

Parts commonly replaced

• Filling loop
• Pressure sensor
• Expansion vessel

Parts commonly replaced

• Trimatik Control Unit
• Control Box PCB
• Outdoor Temperature Sensor

What to check first

1. Locate the reset button (usually marked with a flame or 'R') on the boiler control panel.
2. Press and hold the reset button for 2 to 3 seconds.
3. Wait to see if the burner restarts; if it fails to ignite or locks out again immediately, do not attempt further resets.

Parts commonly replaced

• Burner control unit
• Coding card
• Ignition electrode
• Flame sensor

What to check first

1. Press the Reset button for 2-3 seconds to see if the fault clears
2. Check that your gas meter has credit and the isolation valve is open
3. Ensure the condensate pipe (the white plastic pipe leading outside) isn't frozen if it is cold weather

Parts commonly replaced

• Ignition Electrode
• Flame Sensing Electrode
• Gas Valve
• Fan

Parts commonly replaced

• Fan Assembly
• Burner Control Unit
• Wiring Harness

Parts commonly replaced

• Internal coding plug
• Electronic control board (PCB)
• Wiring harness