- Boilers
- Gas boiler
F3
Ideal F3 on a gas boiler: fan fault
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
On Ideal boilers, F3 is a fan fault: the fan that pushes combustion gases to the flue is not working as expected. Ideal says to reset the boiler once; if F3 remains, contact Ideal or a Gas Safe registered engineer quoting F3.
Safety first
Stop and check this first
- This code involves the flame or the flue, so check that a working carbon monoxide alarm is fitted, as HSE strongly recommends. If it sounds, switch the boiler off, open windows, get everyone outside and call 0800 111 999.
- If you suspect a gas leak: put out any naked flame, do not operate electrical switches, open windows and doors, leave the home and call the National Gas Emergency Service on 0800 111 999 from outside, as Ideal's guide gives the number.
Safe checks you can perform
- Flue terminal from outside
- One reset
- Noise from the boiler
- Fan and wiring test
Leave these tasks to a qualified professional
- Do not attempt this professional task: Combustion analysis after repair
- Do not attempt this professional task: Fan supply and operation test
- Do not attempt this professional task: Flue integrity check
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.
Combustion analysis after repair
What they doAfter fan or flue work, the engineer measures combustion with a flue gas analyser.
They must show youthe analyser printout.
In writingthe readings against the manufacturer's figures.
Fan supply and operation test
What they doThe engineer checks the fan connections and supply from the PCB and runs the fan.
They must show youthe fan test.
In writingwhat failed and the reference of any part replaced.
Flue integrity check
What they doThe engineer inspects the flue from boiler to terminal for joints, damage and blockage.
They must show youthe flue inspection.
In writingthe flue condition.
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.
Flue terminal from outside
- Who:
- you, from the ground.
- How:
- look at the flue terminal outside without touching or climbing.
- Result that matters:
- whether anything blocks or damages it.
- If it is blocked or damaged:
- keep the boiler off and tell the engineer.
- If it looks clear:
- the fan or its wiring stay the main suspects.
- Evidence to keep:
- a photo of the terminal from the ground.
Evidence: Ideal Instinct2 user guide · HSE gas safety for homeowners
One reset
- Who:
- you.
- How:
- press the restart button once, as Ideal advises for F3.
- Result that matters:
- whether F3 clears.
- If F3 returns:
- contact Ideal or a Gas Safe engineer quoting F3.
- If it clears:
- note the date; a repeat confirms a fault.
- Evidence to keep:
- a photo of the display and the time.
Evidence: Ideal Instinct2 user guide · Ideal Heating FAQ: what does my boiler fault code mean?
Noise from the boiler
- Who:
- you.
- How:
- listen when the boiler tries to start for an unusual whine or rattle, without opening it.
- Result that matters:
- whether the fan sounds abnormal.
- If it whines or rattles:
- mention it; it points to the fan.
- If it is silent:
- wiring or control become more likely.
- Evidence to keep:
- a short note or recording.
Evidence: Ideal Instinct2 user guide
Fan and wiring test
- Who:
- Ideal or a Gas Safe registered engineer.
- How:
- tests the fan, its wiring and supply from the PCB and checks the flue.
- Result that matters:
- which part stops the fan.
- If the fan fails the test:
- it is replaced.
- If the fan is fine:
- wiring, PCB or flue are investigated.
- Evidence to keep:
- a job sheet with results.
The fan is part of the sealed combustion system; only a Gas Safe registered engineer opens it.
Evidence: Ideal Instinct2 user guide · HSE gas safety for homeowners · Ideal Heating FAQ: what does my boiler fault code mean?
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
- Ideal Heating
- Product type
- Gas boiler
Known code variants
- aire acondicionado Daikin F3
- climatisation Daikin F3
- climatizzatore Daikin F3
- cocina LG F3 panel
- code erreur F3 Daikin
- codice F3 Daikin
- código F3 Daikin
- Daikin AC F3
- Daikin error F3
- Daikin F3
- Daikin Fehler F3
- Daikin Fehlercode F3
- DishDrawer F3
- error F3 Daikin
- error F3 DishDrawer
- errore F3 Daikin
- F 3
- Fisher & Paykel DishDrawer F3
- Fisher Paykel F3
- Gree F3
- Ideal boiler F3
- Ideal boiler F3 fan fault
- Ideal F03
- Ideal F3
- Ideal Logic F3
- Klimaanlage Daikin F3
- LG F-3 horno
- LG F3 horno
- LG F3 touch pad
- LG horno F3 teclas
- LG lightwave F3
- LG microondas F3
- LG microwave F-3 touch panel
- LG microwave F3
- LG oven F-3
- LG oven F3 keypad
- LG range F3
- microondas LG F-3 panel
- panne F3 Daikin
What it means
Ideal's FAQ and the Instinct2 user guide list F3 as fan fault. Ideal explains that the fan makes sure potentially harmful gases from combustion are pushed into the flue and released safely outside. The control stops the boiler when the fan does not behave as expected. The code does not separate a failed fan from its wiring, its control on the PCB or a flue problem that stops it reaching speed; those are engineer checks.
Warnings and stop conditions
- Higheditorial warning
This code involves the flame or the flue, so check that a working carbon monoxide alarm is fitted, as HSE strongly recommends. If it sounds, switch the boiler off, open windows, get everyone outside and call 0800 111 999.
Evidence: HSE gas safety for homeowners · Ideal Heating FAQ: what does my boiler fault code mean?
- Criticaleditorial warning
If you suspect a gas leak: put out any naked flame, do not operate electrical switches, open windows and doors, leave the home and call the National Gas Emergency Service on 0800 111 999 from outside, as Ideal's guide gives the number.
Evidence: Ideal Instinct2 user guide · HSE gas safety for homeowners
Symptoms and causes
Probable causes · in order
- Fan or its wiringPossible
Fits if F3 returns straight after a reset; the fan and its connections are inside the sealed case and need an engineer.
Evidence: Ideal Instinct2 user guide · Ideal Heating FAQ: what does my boiler fault code mean?
- Control boardLess common
Fits if the fan and wiring test correct but the boiler still reports F3; Ideal lists PCB faults separately and leaves them to engineers.
Evidence: Ideal Instinct2 user guide
- Flue obstructionPossible
Fits if the flue terminal outside is visibly blocked or damaged; the fan cannot clear the gases properly.
Evidence: Ideal Instinct2 user guide · HSE gas safety for homeowners
Virtual technician
Does F3 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
Ideal Heating · 2023 · manual
- 2
Health and Safety Executive · official_doc
- 3
Ideal Heating FAQ: what does my boiler fault code mean?
Ideal Heating · official_doc
Was this entry useful?