Johnson & Starley
Johnson & Starley air proving switch S01325 (SDV70-260G only)
An air proving switch (manufacturer code 0305487) for the Johnson & Starley STATE SDV70-260G boiler only, confirming safe flue draught before the burner fires.
At a glance
- Also known as 1691425
- Work should only be carried out by a Gas Safe registered engineer
£378.55
£315.46 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
An air proving switch, manufacturer code 0305487, for the Johnson & Starley STATE SDV70-260G gas boiler. It confirms the fan is producing adequate air/flue flow before the ignition sequence is allowed to proceed, acting as a safety interlock.
Signs this part needs replacing
- Boiler fails to start or locks out before ignition
- Fan runs but the boiler does not proceed to light the burner
- Intermittent lockouts linked to airflow/fan speed
- Engineer diagnosis of a faulty air proving switch during fault-finding
Before you order
- Confirm your model is SDV70-260G - this part is not shared with other SDV models
- Isolate electrical power before removing the old switch
- Work should only be carried out by a Gas Safe registered engineer
Compliance
| Alternative numbers | 1691425 |
|---|
No fitment data held for this part.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
No documents held for this part. The technical team will source them from the manufacturer — usually the same working day.
No technical questions yet for this part.
Not sure which part?
Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.