- Boilers
- Gas boiler
F32
Saunier Duval F.32 on a gas boiler: fan fault
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Saunier Duval F.32 means a fan fault. Look from outside for a blocked flue outlet and notice any smell of fumes. Press the reset key once and wait five seconds; if it comes back, call the official service centre.
Safety first
Stop and check this first
- If you smell fumes indoors: Saunier Duval says to open doors and windows fully, switch the appliance off and call a professional. A blocked flue can fill the home with carbon monoxide, which has no smell: if you feel headache, dizziness or nausea, ventilate, get out and call for help. A CO alarm helps.
- If you smell gas: Saunier Duval says to keep away from the area, open doors and windows, light no flames and do not smoke, do not touch switches, sockets, doorbells or phones, close the meter and appliance gas valves, warn neighbours without the bell, leave the building and call the gas company from a phone outside.
Safe checks you can perform
- Smell of gas or fumes
- Flue terminal seen from outside
- One reset with the fault key
- Fan and duct check by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Fan speed against the data plate
- Do not attempt this professional task: Air and flue duct inspection
- Do not attempt this professional task: Combustion analysis after the repair
- Do not attempt this professional task: Fault memory
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.
Fan speed against the data plate
What they doThe technician runs test programme P.01 and reads the fan speed with diagnostic code d.34, at maximum and minimum load.
They must show youthe measured speed against the manufacturer's specification.
In writingthe result and, if the fan was replaced, the part reference and why.
Air and flue duct inspection
What they doThe technician checks the air supply and flue gas extraction along their whole route for obstructions.
They must show youthe state of the duct and terminal.
In writingwhat was found and what was cleared or repaired.
Combustion analysis after the repair
What they doThe technician measures CO2 at the flue gas analysis point with an analyser.
They must show youthe analyser printout against the manufacturer's specification.
In writingthe CO2 measured and whether it was adjusted.
Fault memory
What they doThe technician reads the last 10 codes stored in the fault memory.
They must show youthe code list.
In writingthe codes found before clearing them.
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
- Who:
- you.
- How:
- without any flame nearby, notice whether there is a smell of gas or fumes near the boiler.
- Result that matters:
- whether there is any smell.
- If it smells of gas:
- follow Saunier Duval's gas warning and leave the home.
- If it smells of fumes:
- open doors and windows, switch the appliance off and call a professional.
- Evidence to keep:
- a note of the time and what you noticed.
Evidence: Saunier Duval ThemaFast Condens, instrucciones de funcionamiento 0020238204_00
Flue terminal seen from outside
- Who:
- you.
- How:
- look at the boiler's flue outlet from the ground or a window, without touching it or climbing.
- Result that matters:
- whether anything covers or blocks it.
- If you see a blockage:
- do not remove it yourself; tell the technician.
- If it is clear:
- the cause is in the fan, its wiring or the electronics.
- Evidence to keep:
- photos of the terminal.
Evidence: Saunier Duval ThemaFast Condens, instrucciones de instalación y mantenimiento 0020238203_00
One reset with the fault key
- Who:
- you.
- How:
- press the fault clearing (reset) key and wait five seconds, as Saunier Duval describes. Do it once only.
- Result that matters:
- whether F.32 comes back.
- If it clears and stays away:
- note the date and tell the technician at the next service.
- If it persists or returns:
- do not keep trying; call the official service centre.
- Evidence to keep:
- a photo of the display with the code and the time.
Evidence: Saunier Duval ThemaFast Condens, instrucciones de funcionamiento 0020238204_00
Fan and duct check by the technician
- Who:
- official service centre technician.
- How:
- checks connectors and wiring harness, tests the fan and its speed and checks the air inlet and flue outlet.
- Result that matters:
- which cause in the table applies.
- If the duct is blocked:
- it is cleared and combustion is checked.
- If the duct is clear:
- fan, connections and electronics are checked.
- Evidence to keep:
- a report of what was checked and replaced.
The fan is part of the gas and air unit. Saunier Duval reserves inspection, repair and gas settings for a specialist installer: do not open the boiler.
Evidence: Saunier Duval ThemaFast Condens, instrucciones de instalación y mantenimiento 0020238203_00
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
- Saunier Duval
- Product type
- Gas boiler
Known code variants
- ecoTEC F.32
- Error F32 Saunier Duval
- Error F32 Vaillant
- F.32
- Saunier Duval F.32
- ThemaFast Condens F.32
- Vaillant F.32
What it means
In the ThemaFast Condens table, F.32 is fault: fan. Saunier Duval lists a badly inserted fan connector, a badly inserted circuit board multi connector, a break in the wiring harness, a blocked fan, an electronics fault and an obstructed air supply or flue gas extraction as possible causes. The fan moves combustion air and flue gases; the code does not say whether the fan itself, its connection or the flue duct is at fault.
Warnings and stop conditions
- Higheditorial warning
If you smell fumes indoors: Saunier Duval says to open doors and windows fully, switch the appliance off and call a professional. A blocked flue can fill the home with carbon monoxide, which has no smell: if you feel headache, dizziness or nausea, ventilate, get out and call for help. A CO alarm helps.
Evidence: Saunier Duval ThemaFast Condens, instrucciones de funcionamiento 0020238204_00
- Criticalsource verified
If you smell gas: Saunier Duval says to keep away from the area, open doors and windows, light no flames and do not smoke, do not touch switches, sockets, doorbells or phones, close the meter and appliance gas valves, warn neighbours without the bell, leave the building and call the gas company from a phone outside.
Evidence: Saunier Duval ThemaFast Condens, instrucciones de funcionamiento 0020238204_00
Symptoms and causes
Probable causes · in order
- Blocked air inlet or flue outletPossible
If the flue terminal or air inlet is covered, the fan cannot move the expected flow; this shows when the duct is checked, not in the boiler.
Evidence: Saunier Duval ThemaFast Condens, instrucciones de instalación y mantenimiento 0020238203_00
- Blocked fanPossible
If the duct is clear and the fan does not turn or does not reach its speed, Saunier Duval points to a blocked fan.
Evidence: Saunier Duval ThemaFast Condens, instrucciones de instalación y mantenimiento 0020238203_00
- Fan connector or wiring harnessPossible
If the fan runs when tested but F.32 returns, the cause may be its connector, the circuit board multi connector or a broken wire.
Evidence: Saunier Duval ThemaFast Condens, instrucciones de instalación y mantenimiento 0020238203_00
- Electronics faultLess common
If fan, wiring and duct are fine, the electronics remain, which Saunier Duval also lists among the causes.
Evidence: Saunier Duval ThemaFast Condens, instrucciones de instalación y mantenimiento 0020238203_00
Virtual technician
Does F32 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
Saunier Duval ThemaFast Condens, instrucciones de instalación y mantenimiento 0020238203_00
Saunier Duval · 2016 · manual
- 2
Saunier Duval ThemaFast Condens, instrucciones de funcionamiento 0020238204_00
Saunier Duval · 2016 · manual
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