Worcester Bosch
Worcester Bosch Pressure Switch 87186445850
Pressure switch for Worcester Bosch Greenstar 2000 Combi and Gr2300IW combi boilers.
At a glance
- Part type: pressure switch
- Also known as 8905406
£79.43
£66.19 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 pressure switch is a Worcester Bosch component listed under part number 87186445850. It fits the Greenstar 2000 Combi and Greenstar Gr2300IW combi appliance families. The switch responds to pressure conditions within the boiler and signals the control system accordingly.
Signs this part needs replacing
- The boiler fails to fire or locks out when a demand for heat or hot water is present
- Fan or pump operation continues without the boiler igniting
- Intermittent fault codes relating to pressure or air pressure sensing
- Boiler starts and stops repeatedly during a call for heat
Before you order
- Confirm the boiler model and GC number against the fitment list above
- Check the fuel type and output variant of the installed appliance, as both LPG and NG versions are covered by this part range
- Verify the existing switch carries the same Worcester Bosch part number 87186445850
- Isolate the appliance and follow the manufacturer's service instructions before removal or fitting
Mechanical
| Part type | PRESSURE SWITCHES |
|---|
Compliance
| Manufacturer part number (MPN) | 87186445850 |
|---|---|
| Alternative numbers | 8905406 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 2000 COMBI GR2300iW 25 C LPG | 47-800-27 | 47-800-27 | — | — |
| WORCESTER GREENSTAR 2000 COMBI GR2300iW 25 C NG | 47-800-26 | 47-800-26 | — | — |
| WORCESTER GREENSTAR 2000 COMBI GR2300iW 30 C LPG | 47-800-29 | 47-800-29 | — | — |
| WORCESTER GREENSTAR 2000 COMBI GR2300iW 30 C NG | 47-800-28 | 47-800-28 | — | — |
| WORCESTER GREENSTAR GR2300iW 25 C LPG COMBI | 47-800-27 | 47-800-27 | — | — |
| WORCESTER GREENSTAR GR2300iW 25 C NG COMBI | 47-800-26 | 47-800-26 | — | — |
| WORCESTER GREENSTAR GR2300iW 30 C LPG COMBI | 47-800-29 | 47-800-29 | — | — |
| WORCESTER GREENSTAR GR2300iW 30 C NG COMBI | 47-800-28 | 47-800-28 | — | — |
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.