Worcester Bosch
Worcester Bosch harness sensor 8716121321
Genuine Worcester harness sensor for the GR4700iW combi range, covering 12, 15, 18, 21 and 24 outputs in NG and LPG.
At a glance
- Also known as 8922969
- Fitting should be carried out by a Gas Safe registered engineer
£14.87
£12.39 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 8716121321 is Worcester's harness sensor for the GR4700iW combi boiler range. It links the boiler's temperature sensor(s) into the wiring loom feeding the control board, allowing the boiler to monitor water temperature accurately.
Signs this part needs replacing
- Boiler shows an erratic or implausible temperature reading
- Intermittent lockouts on a sensor fault code
- Wiring insulation on the existing harness is cracked, melted or discoloured near a hot component
- Connector pins are corroded or loose, causing a poor connection
Before you order
- Match the part number 8716121321 printed on the existing harness or its packaging
- Confirm your exact GR4700iW output size and gas type (NG/LPG)
- Isolate the electrical supply before disconnecting the old harness
- Fitting should be carried out by a Gas Safe registered engineer
Compliance
| Alternative numbers | WB8716121321, 8922969 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 12 S LPG | 41-800-08 | 41-800-08 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 12 S NG | 41-800-07 | 41-800-07 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 15 S LPG | 41-800-10 | 41-800-10 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 15 S NG | 41-800-09 | 41-800-09 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 18 S LPG | 41-800-12 | 41-800-12 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 18 S NG | 41-800-11 | 41-800-11 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 21 S LPG | 41-800-14 | 41-800-14 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 21 S NG | 41-800-13 | 41-800-13 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 24 S LPG | 41-800-16 | 41-800-16 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 24 S NG | 41-800-15 | 41-800-15 | — | — |
Showing 10 of 20 compatible appliances.
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.