BoilerFaultCodesVaillant S.32 Fault Code
Also written as S32 — same fault.
The Vaillant S.32 fault code means: your boiler is temporarily pausing because the fan is having trouble reaching or maintaining the correct speed to start the ignition process safely.. It appears on 31 Vaillant models in our database.
Technical description: Waiting time deviation: Fan speed. The waiting period for the fan start-up is activated.
What causes the Vaillant S.32 fault?
This fault occurs when the boiler's control system detects that the fan isn't spinning at the precise speed required to safely clear exhaust gases and bring in fresh air. It is often caused by a failing fan motor, a buildup of debris inside the fan, or a communication issue where the main circuit board cannot correctly read the fan's speed. Because the boiler cannot guarantee a safe combustion process, it temporarily pauses operation until the fan speed stabilizes.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like S.32: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Vaillant models that show the S.32 fault code
Click a model for the full fault code list and model-specific repair notes.
- ecoFIT Pure 412 Repair: £180-350
- ecoFIT Pure 418 Repair: £180-350
- ecoFIT Pure 425 Repair: £180-350
- ecoFIT Pure 435 Repair: £180-350
- ecoFIT Pure 825 Repair: £100-250
- ecoFIT Pure 830 Repair: £180-350
- ecoFIT Pure 835 Repair: £150-300
- ecoMAX Repair: £120-250
- ecoMAX 613 Repair: £180-450
- ecoMAX 618 Repair: £180-450
- ecoMAX 622 Repair: £180-450
- ecoMAX 635 Repair: £180-450
- ecoMAX 824/2 E Repair: £180-450
- ecoMAX 828/2 E Repair: £180-450
- ecoMAX 835 E Repair: £180-450
- Ecomax Condensing 600/800 series Repair: £100-250
- ecoTEC exclusive Repair: £0-280
- ecoTEC plus Repair: £120-250
- ecoTEC plus VU GB 656/4-5 A Repair: £120-250
- ecoTEC pro Repair: £180-450
- ecoTEC sustain Repair: £250-£450
- Home Combi 25 Repair: £150-350
- Home Combi 30 Repair: £150-350
- Home Combi 35 Repair: £150-350
- Turbomax 824/828 Repair: £150-350
- Turbomax Plus Repair: £150-300
- Turbomax Plus 824/828E Repair: £150-350
- Turbomax Plus 828 Repair: £180-450
- Turbomax Plus 828 E Repair: £150-350
- Turbomax Plus VUW 242E Repair: £150-350
- Turbomax Plus VUW 242EH Repair: £150-350
Source
Vaillant S.32 fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.
- Vaillant ecoFIT Pure 425 manual (PDF)
- Vaillant ecoFIT Pure 435 manual (PDF)
- Vaillant ecoFIT Pure 835 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026