Vaillant F.32 Fault Code (ecoTEC plus/pro (manual models))

Safety disclaimer

Fault code summary

Manufacturer

Vaillant

Fault code

F.32

Fault type

Fan, Flue, Electrical

Severity

high

Reset

Not specified

Applicable models

ecoTEC plus 612, ecoTEC plus 615, ecoTEC plus 618, ecoTEC plus 624, ecoTEC plus 630, ecoTEC plus 637, ecoTEC plus 824, ecoTEC plus 831, ecoTEC plus 837, ecoTEC pro 28

Quick answer

Fan speed variation.

What does this fault code mean?

Fan speed variation.

Common causes

• Fan blocked.
• Fan plug incorrectly inserted.
• Hall sensor defective.
• Cable harness fault.
• Electronics defective.

Symptoms

This information was not provided in the verified manufacturer source.

What can the homeowner safely check?

This information was not provided in the verified manufacturer source.

Boiler reset information

Reset information was not provided in the verified manufacturer source. Do not repeatedly reset an unresolved fault.

When should I call an engineer?

Contact a suitably qualified heating engineer when the fault persists, the boiler locks out, or the manufacturer instructions do not resolve it. For gas appliance work in the UK, use a Gas Safe registered engineer.

Engineer diagnosis

• Check fan, fan feedback, harness and electronics.

Applicable boiler models

• ecoTEC plus 612
• ecoTEC plus 615
• ecoTEC plus 618
• ecoTEC plus 624
• ecoTEC plus 630
• ecoTEC plus 637
• ecoTEC plus 824
• ecoTEC plus 831
• ecoTEC plus 837
• ecoTEC pro 28

Related fault codes

• F.22 — ecoTEC plus/pro (manual models)

  Dry fire.

  Read fault code
• F.23 — ecoTEC plus/pro (manual models)

  Water shortage; the temperature difference between flow and return NTC is too large.

  Read fault code
• F.24 — ecoTEC plus/pro (manual models)

  Water shortage; temperature rise too quick.

  Read fault code
• F.25 — ecoTEC plus/pro (manual models)

  Interruption in the compact thermal module cable harness.

  Read fault code
• F.28 — ecoTEC plus/pro (manual models)

  The appliance does not start: attempts to ignite during start failed.

  Read fault code
• F.29 — ecoTEC plus/pro (manual models)

  The flame goes off during operation and subsequent ignition attempts fail.

  Read fault code
• F.49 — ecoTEC plus/pro (manual models)

  eBUS undervoltage.

  Read fault code
• F.61 — ecoTEC plus/pro (manual models)

  Gas-valve control defective.

  Read fault code

Manufacturer documentation

F.32 | Fan speed variation | Fan blocked, plug not inserted correctly on fan, hall sensor defective, fault in cable harness, electronics defective

Last verified

2026-09-12

Frequently asked questions