Alpha
Alpha By-Pass Assembly 3.017174
By-pass assembly for Alpha CD and HE series LPG gas boilers, part number 3.017174.
At a glance
- Also known as BYPASS-ASSEMBLY, BY-PASS-ASSY, 1257773
Showing prices
£100.00
£83.33 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 Alpha 3.017174 is a by-pass assembly for Alpha gas boilers. It is used in Alpha CD and HE series LPG models. As a by-pass assembly, it provides a bypass route within the boiler's water circuit.
Signs this part needs replacing
- Boiler fails to reach or maintain the set temperature
- Radiators or hot water not heating as expected
- Unusual noises from the boiler during operation
- Leaks or drips from the by-pass assembly area
- Boiler lockout or error codes related to water flow
Before you order
- Confirm your boiler model is listed in the Fits section
- Check the GC number on your boiler's data badge
- Verify the part number 3.017174 matches your existing component
- Ensure your boiler is an LPG model as listed
Compliance
| Alternative numbers | BYPASS-ASSEMBLY, BY-PASS-ASSY, 1257773 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| ALPHA ALPHA CD20S | — | — | — | |
| ALPHA ALPHA CD28C EXTRA | — | — | — | |
| ALPHA ALPHA CD28C EXTRA LPG | — | — | — | |
| ALPHA ALPHA CD35C | — | — | — | |
| ALPHA ALPHA CD35C LPG | — | — | — | |
| ALPHA CD20S | 41-532-18 | 41-532-18 | — | — |
| ALPHA CD20S (LPG) | 41-532-19 | 41-532-19 | — | — |
| ALPHA CD25C | 47-532-31 | 47-532-31 | — | — |
| ALPHA CD25C (LPG) | 47-532-32 | 47-532-32 | — | — |
| ALPHA CD25X | 47-532-39 | 47-532-39 | — | — |
Showing 10 of 25 compatible appliances.
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.
manual
ALPHA appliance manual — CD20S (GC 41-532-18), CD20S (LPG) (GC 41-532-19), CD28S (GC 41-532-20), CD28S (LPG) (GC 41-532-21)
manualmanualALPHA appliance manual — CD25C (GC 47-532-31), CD25C (LPG) (GC 47-532-32), CD28C (GC 47-532-33), CD28C (LPG) (GC 47-532-34), CD28C EXTRA, CD28C EXTRA (LPG), CD35C (GC 47-532-35), CD35C (LPG) (GC 47-532-36)
manualmanualALPHA appliance manual — CD25X (GC 47-532-39), CD25X (LPG) (GC 47-532-40), CD28X (GC 47-532-37), CD28X (LPG) (GC 47-532-38)
manualmanualALPHA appliance manual — HE25 (GC 47-532-41), HE25 (LPG) (GC 47-532-42), HE33 (GC 47-532-43), HE33 (LPG) (GC 47-532-44)
manualNo 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.