- Boilers
- Gas boiler
F62
Ferroli F62 on a gas boiler: combustion fault on BlueHelix Pro
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Ferroli F62 means a combustion fault on the BlueHelix Pro RRT 24 C: low gas pressure, unstable mains voltage or a badly placed electrode. If it does not clear by itself or keeps coming back, call an authorised gas technician.
Safety first
Stop and check this first
- If you smell gas, do not reset: do not touch switches or light flames, open windows, close the gas tap if it is within reach, leave and call your gas distributor's emergency number from outside. Ferroli says to switch a faulty boiler off and have it repaired only by an authorised technician.
- Ferroli warns of a risk of asphyxia or poisoning if the flue circuit is not sealed. Headache, dizziness or nausea can mean carbon monoxide: switch the boiler off, ventilate, leave and get help. Keep a CO alarm nearby.
- Do not keep pressing reset: the same table has A64, which trips when the maximum number of consecutive resets is exceeded and requires the power to be cut for 60 seconds. If F62 or A54 return, leave the boiler off.
Safe checks you can perform
- Smell of gas or fumes near the boiler
- Model and letter of the code
- Gas tap and other gas appliances
- Single reset with the reset key
- Gas, voltage, electrode and calibration by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Gas supply pressure measurement
- Do not attempt this professional task: Ignition electrode and earth check
- Do not attempt this professional task: 100 % Calibration and CO2 measurement
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Gas supply pressure measurement
What they doThe technician measures the gas pressure at the boiler inlet with a gauge while the boiler is running.
They must show youthe gauge reading.
In writingthe pressure measured against the manufacturer's specification.
Ignition electrode and earth check
What they doWith the power off and the gas closed, they check the position and condition of the electrode and its earth connection, and replace it if damaged.
They must show youthe electrode and its connection, with a photo.
In writingwhether it was repositioned or replaced.
100 % Calibration and CO2 measurement
What they doThey cut the power for 10 seconds, cancel the fault, run the 100 % Calibration (Sc15 = 1) and check CO2 at maximum and minimum output with an analyser.
They must show youthe analyser printout.
In writingthe CO2 values measured against the manufacturer's specification.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Smell of gas or fumes near the boiler
- Who:
- you.
- How:
- go near without pressing switches or turning on lights and notice whether there is a smell of gas or combustion fumes.
- Result that matters:
- whether there is a smell or not.
- If there is a smell:
- do not touch the boiler and follow the gas warning on this page.
- If there is no smell:
- move on to the model and the code.
- Evidence to keep:
- the time and what you noticed.
Evidence: Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Model and letter of the code
- Who:
- you.
- How:
- find the model on the front or on the data plate without opening the casing and note whether the display shows F62, F63, A54 or A55.
- Result that matters:
- whether it is a BlueHelix Pro and whether the lockout is temporary (F) or permanent (A).
- If it shows F62 or F63:
- wait without pressing anything; Ferroli says it clears when the value returns to normal.
- If it shows A54 or A55:
- move on to the single reset.
- Evidence to keep:
- photo of the display and the data plate.
Evidence: Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Gas tap and other gas appliances
- Who:
- you.
- How:
- check that the gas tap before the boiler is open, as Ferroli asks at start up, and note whether the hob or other gas appliances work normally.
- Result that matters:
- whether gas is reaching the home.
- If the tap was closed:
- open it and see whether the code clears.
- If other appliances also fail:
- contact your gas distributor.
- Evidence to keep:
- tap position and which appliances fail.
Evidence: Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Single reset with the reset key
- Who:
- you.
- How:
- only if there is no smell of gas or fumes and the code starts with A, press the reset key for one second, as Ferroli describes. Once only.
- Result that matters:
- whether the boiler runs again without the code.
- If it works:
- note the date, time and any power cuts.
- If it does not restart or the code returns at once:
- leave it locked out and call the technician.
- Evidence to keep:
- the result of the reset.
Evidence: Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Gas, voltage, electrode and calibration by the technician
- Who:
- authorised gas technician.
- How:
- measures the gas supply pressure, checks the mains voltage, inspects the ignition electrode and its earth and, if all is fine, runs the 100 % Calibration.
- Result that matters:
- which cause in the table is present.
- If gas pressure or voltage is wrong:
- the problem is outside the boiler.
- If the electrode or the setting is wrong:
- it is corrected and calibrated again.
- Evidence to keep:
- measured values and the calibration done.
Ferroli says to cut the power and close the gas tap before touching the electrode, and to calibrate with the front cover closed and the flue ducts fitted. Not a job for the user.
Evidence: Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Boilers
- Brand
- Ferroli
- Product type
- Gas boiler
Known code variants
- 62
- BlueHelix Pro F62
- code erreur F62 chaudière Vaillant
- codice F62 Vaillant
- código F62 Vaillant
- error F62 caldera Vaillant
- Error F62 Ferroli
- Error F62 Saunier Duval
- errore F62 caldaia Vaillant
- F 62
- Fehlercode F62 Vaillant
- Ferroli A54
- Ferroli A55
- Ferroli F62
- Ferroli F63
- panne F62 Vaillant
- Saunier Duval F.62
- ThemaFast Condens F.62
- Vaillant boiler F62
- Vaillant F.62
- Vaillant F62
- Vaillant Fehler F62
What it means
On the BlueHelix Pro RRT 24 C, F62 shares a row with F63, A54 and A55: combustion fault. Ferroli gives three causes: low gas pressure in the installation, unstable mains voltage and an ignition electrode that is badly placed or damaged. As a last step it says to cut the power for 10 seconds, cancel the fault and run a 100 % Calibration (Sc15 = 1). F faults are temporary lockouts that clear by themselves; A faults are permanent and are reset with the reset key. The code does not say which cause applies to you.
Warnings and stop conditions
- Criticaleditorial warning
If you smell gas, do not reset: do not touch switches or light flames, open windows, close the gas tap if it is within reach, leave and call your gas distributor's emergency number from outside. Ferroli says to switch a faulty boiler off and have it repaired only by an authorised technician.
Evidence: Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
- Criticaleditorial warning
Ferroli warns of a risk of asphyxia or poisoning if the flue circuit is not sealed. Headache, dizziness or nausea can mean carbon monoxide: switch the boiler off, ventilate, leave and get help. Keep a CO alarm nearby.
Evidence: Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
- Highsource verified
Do not keep pressing reset: the same table has A64, which trips when the maximum number of consecutive resets is exceeded and requires the power to be cut for 60 seconds. If F62 or A54 return, leave the boiler off.
Evidence: Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Symptoms and causes
Probable causes · in order
- Low gas pressure in the installationCommon
It is the first cause in the table. It fits if the boiler struggles to start or stops while other gas appliances in the home are running.
Evidence: Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
- Unstable mains voltagePossible
Ferroli lists unstable supply voltage. It fits if F62 coincides with power cuts, flickering lights or storms; the same table has F34 for voltage below 170 V.
Evidence: Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
- Ignition electrode badly placed or damagedPossible
A shifted or worn electrode gives a poor combustion signal. It is confirmed by checking its position and earth connection with the boiler open.
Evidence: Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
- Combustion calibration out of adjustmentLess common
If the causes above are fine, Ferroli says to cancel the fault and repeat the 100 % Calibration. It points to a setting left out of range after a fault or a part change.
Evidence: Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Virtual technician
Does F62 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Ferroli · 2018 · manual
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