Common problems guide

The most common Ferroli Bluehelix HiTech RRT problems

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

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

The 6 most common faults

01
A01 High DIY-safe

Your boiler has failed to light, which means your heating and hot water will not work until the gas supply or ignition system is restored.

What to try first

Check that your gas meter has credit and the isolation valve is openCheck if other gas appliances in your home, like a hob, are workingPress the 'Reset' button on the boiler control panel for 1 second

Est. cost
£120-350
Parts
Ignition electrode, Gas valve, PCB (Control board)
Full guide for A01
02
A08 High DIY-safe

Your boiler has switched itself off because it has detected it is getting too hot, likely due to a lack of water flow or a sensor issue.

What to try first

Check that your boiler pressure is between 1 and 1.5 bar on the displayEnsure all radiator valves and the isolation valves under the boiler are fully openTry resetting the boiler by pressing the 'Reset' button for one second

Est. cost
£120-350
Parts
Central heating pump, Temperature sensors (NTC), Main heat exchanger (flushing/cleaning)
Full guide for A08
03
A09 High DIY-safe

Your boiler has stopped working because water isn't flowing through the main heating unit properly, causing it to overheat for protection.

What to try first

Check that your boiler pressure is between 1.0 and 1.5 barEnsure all radiator valves and isolation valves are fully openTry resetting the boiler if the pressure is correct

Est. cost
£120-£450
Parts
Circulation pump, Main heat exchanger, System filter (cleaning/replacement)
Full guide for A09
04
A26 High DIY-safe

Your boiler has shut down because it has detected high water pressure too many times in a single day, which usually points to a system blockage or a faulty expansion tank.

What to try first

Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too high (above 2.5 bar), bleed water from a radiator using a bleed key to lower the pressure.Ensure the filling loop valves are tightly closed and not accidentally letting water into the system.

Est. cost
£120-280
Parts
Expansion Vessel, Pressure Sensor, Safety Relief Valve
Full guide for A26
05
A98 High DIY-safe

Your boiler's internal computer has encountered a software glitch or a configuration error and needs to be restarted and recalibrated.

What to try first

Press the Reset button on the boiler control panelWait for the boiler to complete its automatic startup sequenceIf the code persists, the boiler may require a professional 'Auto Setup' calibration

Est. cost
£100-350
Parts
Main PCB (Printed Circuit Board), Display Interface
Full guide for A98
06
F09 High DIY-safe

Your boiler has shut down because it is getting too hot and water is not moving through the system correctly.

What to try first

Check that your system pressure is between 1.0 and 1.5 bar on the gaugeEnsure all radiator valves are fully open to allow water flowTry resetting the boiler using the 'R' button once the unit has cooled down

Est. cost
£120-£350
Parts
Return temperature sensor (NTC), Circulation pump, Main heat exchanger (flushing/cleaning)
Full guide for F09

on the Ferroli Bluehelix HiTech RRT

Ignition electrodeGas valvePCB (Control board)Central heating pumpTemperature sensors (NTC)Main heat exchanger (flushing/cleaning)

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 36-code list for the Ferroli Bluehelix HiTech RRT