How to reset a Biasi boiler

Has your heating suddenly stopped working? Don’t panic, your boiler might just need a quick reset. Your boiler has probably gone into lockout, which is when it shuts down because it’s detected a problem. This may include-

  • The fan isn’t operational, this takes flue gases from your property
  • There is a burner problem, such as a blocked jet, or debris build-up
  • The gas supply is intermittent (a sign of incorrect gas valve adjustment, or a faulty gas valve)

It is really important to know how to reset your boiler in case of a breakdown or power cut. This will ensure that the boiler starts automatically when electricity supply returns and also helps maintain regular water pressure inside the radiators.

Simple steps to reset your Biasi boiler

Baxi boilers can be reset in three different ways, depending on the model you have

  1. If your Baxi boiler has a reset button:

    -You’ll know your boiler is in lockout when you see a red light either flashing or constantly lit
    -Press and hold the reset button until the red light turns off
    -You may then see a burner light switch on, to show your boiler has fired up again

  2. If your boiler uses a thermostat control knob to reset:

    -You’ll know your boiler is in lockout when you see a red light either flashing or constantly lit
    -To reset, turn the temperature control knob completely anti-clockwise
    -Hold until the red light goes out
    -Turn back to your normal setting
    -Again, a burner light should come on to show that your boiler has fired up again

  3. If your boiler has an ON/OFF/SELECTOR switch:

    -Open the fascia display
    -You may see an error code, or (if you have a boiler without a display screen), a flame failure light
    -Turn the selector switch to the R (‘reset’) position
    -Hold for five seconds before releasing
    -The error code should change, or the flame failure light should stop flashing
    -The burner light will turn orange to show that your boiler is working again

Common Biasi Boiler Problems

ProblemPossible Cause
No heat or hot waterBroken diaphragms and airlocks, failure of motorised valves, issues with the thermostat or low water levels
Leaking and drippingMost common cause is a broken internal component but it will depend where the water is leaking from
Banging, whistling or gurgling noisesA common cause is air in the system, alternatively it could be that the water pressure is too low or it’s kettling
Pilot light goes outCould be a broken thermocouple which is stopping the gas supply
Losing pressureThere could be a water leak in the system, the pressure relief valve needs replacing or the radiators have been bled recently
Frozen condensate pipeYour boiler should display an error code or warning notification
Thermostat issuesThermostat may be turned off or not set to the correct settings (time etc.)
KettlingLimescale or sludge building up on your boiler’s heat exchanger
Radiators not getting hotSludge or air build up in the system or an unequal distribution of heat
Boiler keeps switching itself offCould be low water pressure, a problem with the thermostat or a lack of water flow due to a closed valve, air in the system or the pump not circulating the water in the system correctly

Biasi offers a free 2-year warranty upon installation so that if there’s an issue, you know you’re covered should you encounter a boiler lockout. It may be time to call a gas safe engineer.

If you are in the boiler maintenance industry, you already know that Biasi is one of the most popular boilers available today. However, like other boilers, there may be times when a reset is required. Although this isn’t an everyday occurrence with these units, it does happen occasionally and needs to be handled correctly by a trained professional for safety reasons.