Sime
Sime Air Diaphragm 6028645
Air diaphragm for Sime gas boilers, part number 6028645.
At a glance
- Part type: Air diaphragm
- Also known as 2042068
Showing prices
£4.72
£3.93 ex. VAT · VAT at 20%
Available to order · 3 working days
Available to order · 3 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Sime 6028645 is an air diaphragm for Sime gas boilers. It is a flexible membrane that responds to changes in air pressure within the appliance's air circuit. This part is used in compatible Sime models to help manage air flow or pressure signals.
Signs this part needs replacing
- Boiler fails to ignite or locks out
- Fan runs but boiler does not fire
- Air pressure switch fault or error code
- Intermittent operation or reduced performance
Before you order
- Check your boiler model against the fits list
- Confirm the part number 6028645 matches your existing component
- Inspect the old diaphragm for cracks, hardening or debris
- Consult a qualified heating engineer if unsure
Compliance
| Alternative numbers | 2042068 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| SIME DEWY HE 30/50 WM - 3830011 | 47-719-23 | 47-719-23 | — | — |
| SIME MURELLE HE 12 BFT MET - 8106350 | — | — | — | |
| SIME MURELLE SYSTEM HE12 - 8106360 | 41-283-05 | 41-283-05 | — | — |
| SIME PLANET DEWY 30/50BF MET - 8102700 | — | — | — | |
| SIME SIME DEWY HE 30/50 WM | — | — | — | |
| SIME SIME MURELLE HE 12 BFT MET | — | — | — | |
| SIME SIME MURELLE SYSTEM HE12 | — | — | — |
Fitment listings are a guide, not a guarantee. Plant-room assemblies get modified on site more often than not. Send us the GC number off the data badge and a photo of the existing valve and we will confirm before anything is dispatched.
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 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.