Potterton
Potterton Wiring Harness - Thermal Fuse 5142459
Thermal fuse wiring harness for Potterton Commercial Sirius 2 and Sirius 3 FS90 and FS110 boilers, part number 5142459.
£20.40
£17.00 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
The wiring harness incorporating the thermal fuse, manufactured by Potterton Commercial under part number 5142459. It forms part of the safety circuit on Potterton Commercial Sirius 2 and Sirius 3 boilers, breaking the electrical supply if the fuse element reaches its trip temperature. The harness carries the fuse and its associated wiring and connectors as a single assembly.
Signs this part needs replacing
- Boiler locks out or fails to fire with no other obvious fault
- No heating or hot water despite demand at the controls
- Continuity test across the thermal fuse shows an open circuit
- Harness wiring or fuse body shows heat damage, discolouration or a broken connection
Before you order
- Confirm the boiler is a Potterton Commercial Sirius 2 or Sirius 3 in FS90 or FS110 form
- Check the existing harness part number against 5142459
- Inspect the harness plugs and terminals for corrosion or mechanical damage before fitting
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| POTTERTON COMMERCIAL POTTERTON COMMERCIAL SPARES | — | — | — | |
| POTTERTON COMMERCIAL SIRIUS 2 FS110 | — | — | — | |
| POTTERTON COMMERCIAL SIRIUS 2 FS90 | — | — | — | |
| POTTERTON COMMERCIAL SIRIUS 3 FS110 | — | — | — | |
| POTTERTON COMMERCIAL SIRIUS 3 FS90 | — | — | — |
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.