Common problems guide

The most common Ferroli Bluehelix Tech RRT problems

The faults most likely to send a Ferroli Bluehelix Tech RRT into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

44 documented codes
6 most common
6 DIY-safe checks
0 engineer needed

The 6 most common faults

01
A01 High DIY-safe

Your boiler is failing to light the gas flame, meaning you have no hot water or heating.

What to try first

Check if other gas appliances in your home are working to ensure gas is being supplied.Press the 'Reset' button on the boiler control panel to clear the temporary error.Ensure your pre-payment gas meter has sufficient credit.

Est. cost
£90-£350
Parts
Ignition electrode, Gas valve, Printed Circuit Board (PCB)
Full guide for A01
02
A06 High DIY-safe

Your boiler is failing to stay alight after it tries to start up, meaning it cannot provide heat or hot water.

What to try first

Check that your gas supply is turned on at the meterCheck if other gas appliances in your home are workingPress the 'Reset' button on the boiler control panel

Est. cost
£100-280
Parts
Ignition Electrode, Gas Valve, Ionisation Lead
Full guide for A06
03
A08 High DIY-safe

Your boiler has sensed that the water inside is getting too hot and has shut itself down to prevent damage.

What to try first

Check that all radiator valves are fully open to allow water to circulate.Ensure there is enough pressure in the system by checking the gauge (it should be between 1 and 1.5 bar).Try resetting the boiler by pressing the 'Reset' button.

Est. cost
£120-280
Parts
Overheat Thermostat, Circulation Pump, Flow Temperature Sensor
Full guide for A08
04
A09 High DIY-safe

Your boiler has sensed that the water returning to the unit is too hot, causing it to shut down for safety.

What to try first

Check that at least two or three radiator valves are fully openEnsure the central heating system pressure is between 1.0 and 1.5 barPress the reset button on the boiler control panel

Est. cost
£120-£350
Parts
Return temperature sensor (NTC), Circulation pump, Secondary heat exchanger
Full guide for A09
05
F21 High DIY-safe

Your boiler's internal computer has encountered a configuration error and cannot communicate correctly with the system settings.

What to try first

Switch off the electrical power to the boiler for 30 secondsTurn the power back on and wait for the system to re-initialiseIf the code persists, press the Reset button on the control panel

Est. cost
£180-450
Parts
Printed Circuit Board (PCB), Main Control Panel
Full guide for F21
06
F37 High DIY-safe

Your boiler has stopped working because the water pressure inside the system has dropped too low.

What to try first

Locate the filling loop (the flexible silver hose) underneath or near the boiler.Open the small black taps on the filling loop slowly until you hear water entering the system.Watch the pressure gauge on the boiler display and close the taps once it reaches 1.5 bar.

Est. cost
£0-120
Parts
Filling loop valve, Pressure sensor, Expansion vessel re-pressurisation
Full guide for F37

on the Ferroli Bluehelix Tech RRT

Ignition electrodeGas valvePrinted Circuit Board (PCB)Ignition ElectrodeGas ValveIonisation Lead

Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.

Call a Gas Safe engineer if…

  • You can smell gas or see signs of a leak
  • The Ferroli shows an Emergency or High severity code
  • The boiler keeps locking out after repeated resets
  • You've tried the DIY checks and the fault hasn't cleared
  • There's visible water leaking from the boiler
  • The flame is yellow or orange instead of blue

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See the full 44-code list for the Ferroli Bluehelix Tech RRT