Alpha
Alpha Draught Diverter Diaphragm Assembly 3.012842
Draught diverter diaphragm assembly for Alpha Cb50 (LPG) gas boilers, part number 3.012842.
At a glance
- Also known as 1250598
- If unsure, consult a Gas Safe registered engineer
Showing prices
£8.68
£7.23 ex. VAT · VAT at 20%
Available to order · 7 working days
Available to order · 7 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 Alpha draught diverter diaphragm assembly is a replacement component for the draught diverter on Alpha gas boilers. It is listed under part number 3.012842. This assembly forms part of the boiler's draught diverter arrangement.
Signs this part needs replacing
- Boiler fails to fire or locks out
- Intermittent or erratic boiler operation
- Visible cracks, hardening or distortion of the diaphragm
- Draught diverter not operating correctly
- Signs of poor combustion or flue gas spillage
Before you order
- Confirm your boiler model is Alpha Cb50 (LPG)
- Check the part number on the existing component or in the manufacturer's parts list
- Verify the assembly matches the draught diverter fitted to your appliance
- If unsure, consult a Gas Safe registered engineer
Compliance
| Alternative numbers | 1250598 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| ALPHA CB50 | 47-532-18 | 47-532-18 | — | — |
| ALPHA CB50 (LPG) | — | — | — |
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.
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