- Boilers
- Gas boiler
F13
Ferroli F13 on a gas boiler: flue gas sensor fault
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Ferroli F13 means a flue gas sensor fault: a faulty sensor or wiring that is short circuited or broken. If you smell fumes, switch off and ventilate. If the code does not clear by itself, call an authorised 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 leaves repairs to authorised technicians.
- If you smell fumes or anyone has a headache, dizziness or nausea near the boiler, switch it off, ventilate and get outside: there may be carbon monoxide, which has no smell. Call the technician and do not switch it back on until the flue has been checked. A CO alarm gives early warning.
Safe checks you can perform
- Smell of gas or combustion fumes
- Whether F13 clears by itself or A13 appears
- Flue terminal seen from outside
- Flue sensor checked by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Wiring and connector check
- Do not attempt this professional task: Combustion analysis at the end
- Do not attempt this professional task: Flue gas sensor 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.
Wiring and connector check
What they doThe technician checks the sensor cable to the board for short circuits or breaks and checks the connectors.
They must show youthe cable section or connector checked, with a photo.
In writingthe repair carried out or the part number of the replaced sensor.
Combustion analysis at the end
What they doWith the boiler in test mode, the technician measures CO2 with an analyser at maximum and minimum output, as Ferroli describes.
They must show youthe analyser printout.
In writingthe values measured against the manufacturer's specification.
Flue gas sensor measurement
What they doThe technician measures the sensor resistance with a multimeter and compares it with the Ferroli specification for the current temperature.
They must show youthe value measured against the manufacturer's specification.
In writingthe value and the decision taken.
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 combustion fumes
- Who:
- you.
- How:
- first, check whether there is a smell of gas or combustion fumes near the boiler, or whether anyone has a headache, dizziness or nausea.
- Result that matters:
- whether it is safe to carry on with the checks for F13.
- If you smell gas:
- do not touch the boiler; follow the gas warning and call from outside.
- If you smell fumes:
- switch the boiler off, ventilate and call the technician; do not switch it back on.
- Evidence to keep:
- a note of the time and what you noticed.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
Whether F13 clears by itself or A13 appears
- Who:
- you.
- How:
- Ferroli says F faults are temporary and clear by themselves when the value returns to normal. Watch the display without pressing anything. If you see A13, make a single reset by pressing the reset key for 1 second; on the HiTech, press the key and confirm.
- Result that matters:
- whether the code clears or stays.
- If it clears and does not return:
- note the date and mention it at the service.
- If it stays or A13 returns after the reset:
- call an authorised technician.
- Evidence to keep:
- photo of the display with the code and the time.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
Flue terminal seen from outside
- Who:
- you.
- How:
- look at the flue terminal from the ground or a window, without touching it or climbing.
- Result that matters:
- whether it is damaged, blocked or has objects in it.
- If you see damage or a blockage:
- tell the technician, along with the code.
- If it looks fine:
- the most likely cause is still the sensor or its cable.
- Evidence to keep:
- photos of the terminal.
Evidence: Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
Flue sensor checked by the technician
- Who:
- authorised gas technician.
- How:
- checks the flue sensor wiring for short circuits or breaks and measures the sensor.
- Result that matters:
- whether the sensor or the cable is at fault.
- If the cable is shorted or broken:
- the wiring is repaired.
- If the cable is fine and the sensor reads out of specification:
- the sensor is replaced.
- Evidence to keep:
- job sheet with the measured value and the repair.
Ferroli says to disconnect the power and close the gas tap before any work inside. Opening the casing is not a job for the user. The sensor sits in the flue gas area.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 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
- A13
- anomalía F13 Miele
- anomalie F13 Miele
- BlueHelix F13
- caldera Vaillant F.13
- code erreur F13 lave-vaisselle Miele
- ecoTEC F13
- Error F13 Ferroli
- error F13 lavavajillas Miele
- error F13 Vaillant
- errore F13 lavastoviglie Miele
- F 13
- Fehlercode F13 Miele
- Ferroli A13
- Ferroli F13
- guasto F13 Miele
- Miele dishwasher F13
- Miele F13
- Miele fault F13
- Miele Geschirrspüler Fehler F13
- Vaillant ecoTEC F13
- Vaillant F13
- Vaillant fault code F.13
What it means
On the BlueHelix TECH RRT 28 C and HiTech RRT C, F13 is a flue gas sensor fault; the sensor watches the temperature of the combustion gases. Ferroli gives three causes: faulty sensor, short circuited wiring and broken wiring, and as the fix, check the wiring or replace the sensor. F faults are temporary lockouts that clear by themselves when the value returns to normal; the TECH also has A13, which locks out until reset. The code does not say whether the sensor or its cable is at fault.
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 leaves repairs to authorised technicians.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
- Higheditorial warning
If you smell fumes or anyone has a headache, dizziness or nausea near the boiler, switch it off, ventilate and get outside: there may be carbon monoxide, which has no smell. Call the technician and do not switch it back on until the flue has been checked. A CO alarm gives early warning.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
Symptoms and causes
Probable causes · in order
- Flue gas sensor faultyPossible
Ferroli lists it first. It is confirmed if the sensor reads out of specification while the cable is sound.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
- Wiring short circuitedPossible
A bare, pinched or heat damaged cable gives an impossible reading. The technician finds it by following the cable route.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
- Wiring brokenPossible
A loose or corroded connector or a cut cable leaves the circuit open. A continuity test separates it from the sensor.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
Virtual technician
Does F13 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 HiTech RRT C instrucciones de uso instalación y mantenimiento
Ferroli · 2021 · manual
- 2
Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
Ferroli · 2018 · manual
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