- Boilers
- Gas boiler
A14
Ferroli A14 gas boiler: flue temperature safety lockout
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Permanent lockout A14 on Ferroli BlueHelix RRT boilers means the flue outlet safety device tripped after 3 high flue gas temperature faults (F07 or A07) in 24 hours. Check that cold water pressure is near 1 bar, try at most one 1-second reset, and call an authorised technician if it returns.
Safety first
Stop and check this first
- Never force repeated resets on permanent lockout A14 or open the boiler casing yourself, because if a single 1-second reset does not clear the fault permanently you must switch the appliance off and call an authorised technician so the flue duct cannot overheat.
- If you smell gas around the appliance, open windows immediately, shut off the main gas isolation valve if safe to reach, do not touch electrical switches or create sparks, leave the building, and call the gas emergency service from outside.
Safe checks you can perform
- Verify on the pressure gauge that cold system pressure is at least 0,8 bar
- Perform one single reset attempt using the reset button
- Authorised inspection of primary heat exchanger, probe 191, and parameter b20
Leave these tasks to a qualified professional
- Do not attempt this professional task: Clean and verify heat transfer across the primary heat exchanger
- Do not attempt this professional task: Verify flue material parameter b20 and temperature cut-offs b21 to b25
- Do not attempt this professional task: Test and replace the flue gas temperature sensor (component 191) if faulty
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.
Clean and verify heat transfer across the primary heat exchanger
What they doInspect the flue gas passages and water side of the condensing heat exchanger to remove deposits or air pockets that cause exhaust gas overheating.
They must show youStabilised flue gas temperature on the combustion analyser at full output after servicing the exchanger.
In writingMeasured flow, return, and flue gas temperatures recorded before and after cleaning the heat exchanger.
Verify flue material parameter b20 and temperature cut-offs b21 to b25
What they doCheck transparent parameter b20 (0 standard, 1 PVC, 2 CPVC) and the associated maximum operating and shutdown thresholds (b21 at 88 °C, b22 at 93 °C, b23 at 100 °C or 105 °C, b24 at 93 °C, b25 at 98 °C).
They must show youThe active b20 parameter value on the boiler display matched against the installed flue pipe material.
In writingThe parameter b20 value and flue cut-off temperature left configured on the control board.
Test and replace the flue gas temperature sensor (component 191) if faulty
What they doThe technician checks the flue temperature probe (191) and its wiring as the manual indicates, and replaces the probe if it is faulty.
They must show youProbe 191 checked, or the removed sensor, and the state of its wiring.
In writingPart reference of the replacement flue probe 191 and the result of the probe and wiring check.
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.
Verify on the pressure gauge that cold system pressure is at least 0,8 bar
- Who:
- you, no tools.
- How:
- With the heating system cold, read the pressure gauge (component 145, item 2 in figures 16 or 26) or the display readout to confirm heating water pressure is around 1 bar.
- Result that matters:
- Cold system water pressure sits near 1 bar and is not below the 0,8 bar minimum threshold.
- If pressure is below 0,8 bar when cold, slowly open the filling valve (component 74, item 1 in figures 16 or 26) until the gauge reaches about 1 bar, then close it firmly (the boiler may run the 300-second Fh air venting cycle).
- If the gauge already reads around 1 bar, leave the filling tap closed and proceed to the single reset check.
- Evidence to keep:
- Clear photo of the pressure gauge reading in bar with the appliance cold.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Perform one single reset attempt using the reset button
- Who:
- you, at the panel.
- How:
- Because A-prefix faults are permanent lockouts, press the reset button (item 6 in figure 1) for 1 second (or 1 to 2 seconds and confirm on BlueHelix HiTech RRT C, or via the optional remote timer control) once only.
- Result that matters:
- Code A14 clears and the boiler heats normally without triggering F07, F15, or A07 again.
- If A14 returns or you hear boiling noises inside the casing, do not attempt another reset; switch the boiler off at the power button and book an authorised Ferroli technician.
- If the burner operates normally, note the time of the reset and monitor the display over the next 24 hours.
- Evidence to keep:
- Written note of the date and time of the single reset attempt and any preceding F07, F14, F15, or A07 codes seen.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Authorised inspection of primary heat exchanger, probe 191, and parameter b20
- Who:
- Ferroli engineer.
- How:
- With mains power isolated and the gas cock closed, the technician checks the flue temperature sensor (191), its seating and its wiring, inspects the primary heat exchanger for restriction or scaling, and checks service menu parameter b20 (0 standard, 1 PVC, 2 CPVC) alongside shutdown limits b21 to b25 (60-110 °C range).
- Result that matters:
- Heat transfer across the primary exchanger is unobstructed, probe 191 matches its temperature curve, and parameter b20 matches the installed flue duct.
- If parameter b20 is set to 1 (PVC, 93 °C cut-off in b24) or 2 (CPVC, 98 °C cut-off in b25) on a standard flue or the exchanger is fouled, the engineer corrects the setting or cleans the exchanger.
- If flue sensor 191 is faulty, the technician replaces it with a genuine Ferroli part.
- Evidence to keep:
- Service report stating measured flue gas temperature, the result of the probe 191 check, and the value configured in parameter b20.
Opening the sealed casing involves flue gas integrity, live mains electricity, and gas components, so this step is strictly restricted to qualified professionals.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento · 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
- A 14
- caldera Ferroli A14
- error A14 Ferroli
- Ferroli A14
- Ferroli boiler A14
- Ferroli error A14
What it means
According to the official Ferroli manuals for BLUEHELIX TECH RRT 28 C, BLUEHELIX PRO RRT 24 C, and BlueHelix HiTech RRT C (published in Spanish), code A14 indicates activation of the flue outlet safety device when fault F07 (Tech RRT 28 C and Pro RRT 24 C) or fault A07 (HiTech RRT C) occurs 3 times in the last 24 hours. Those underlying codes (F07, F14, F15, or A07) mean the flue temperature sensor (component 191) detected excessive exhaust temperature. Faults starting with A are permanent lockouts, yet seeing A14 on screen never proves by itself that a part is faulty, since fouled heat exchanger passages, a wrong flue material parameter b20, or probe drift can trigger it.
Warnings and stop conditions
- Highsource verified
Never force repeated resets on permanent lockout A14 or open the boiler casing yourself, because if a single 1-second reset does not clear the fault permanently you must switch the appliance off and call an authorised technician so the flue duct cannot overheat.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
- Highsource verified
If you smell gas around the appliance, open windows immediately, shut off the main gas isolation valve if safe to reach, do not touch electrical switches or create sparks, leave the building, and call the gas emergency service from outside.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Symptoms and causes
Probable causes · in order
- Primary heat exchanger fouling or poor heat transferCommon
The official Ferroli troubleshooting table directs technicians to inspect the heat exchanger for F07 and A07, because scale, debris, or restricted water circulation prevents heat absorption and drives exhaust gas temperatures above the safety cut-off.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
- Flue temperature sensor (component 191) reading out of calibrationPossible
The flue gas temperature probe (191) mounted on the exhaust assembly can drift in resistance before failing completely into open or short circuit (which would display F13 or A13), causing 3 trips within 24 hours.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
- Incorrect flue material parameter b20 settingPossible
On BLUEHELIX PRO RRT 24 C and BlueHelix HiTech RRT C, service parameter b20 selects the flue material (0 standard with shutdown at 100 °C or 105 °C in b23, 1 PVC with shutdown at 93 °C in b24, 2 CPVC with shutdown at 98 °C in b25).
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
- Low cold heating circuit water pressure below 0,8 barLess common
When cold system pressure on the water gauge (145) drops below 0,8 bar, reduced water flow through the primary circuit lets combustion heat build up rapidly at the flue outlet.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Virtual technician
Does A14 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
- 3
Ferroli BLUEHELIX PRO RRT 24 C instrucciones de uso instalación y mantenimiento
Ferroli · 2018 · manual
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