Worcester Bosch
Worcester Bosch Motor Diverter Valve 87186828390
Worcester Bosch motorised diverter valve, part 87186828390, for Greenstar combi and system boilers; directs water between heating and hot water circuits.
At a glance
- Part type: Diverter valves and hydraulics
- Also known as 1031019
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Showing prices
£65.39
£54.49 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 Worcester Bosch 87186828390 is a motorised diverter valve used in Greenstar gas appliances. It sits in the hydraulic section of the boiler and moves an internal paddle to direct water either through the central heating circuit or through the domestic hot water heat exchanger, depending on demand. The motor assembly drives the valve spindle, so the boiler can switch between heating and hot water without manual intervention.
Signs this part needs replacing
- Hot water runs but the radiators stay cold, or heating runs with no hot water at the tap
- Domestic hot water temperature fluctuating between hot and cold during a draw-off
- Whining, buzzing or repeated clicking from the diverter valve motor area
- Boiler locking out or displaying a fault code linked to the diverter valve or DHW circuit
- Valve spindle stiff or seized, with the motor failing to move the paddle through its full travel
Before you order
- Check the GC number on the appliance data badge against the compatibility list, as the same boiler family can use different hydraulic assemblies across build years.
- Confirm the alternative number 1031019 matches the part currently fitted before ordering.
- Inspect the valve body, O-rings and seals while the hydraulic block is open; a seal kit may be needed if the housing is disturbed.
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Mechanical
| Part type | Diverter & Motorised Valves |
|---|---|
| Appliance family | Worcester Greenstar |
| Length | 0.1mm |
| Width | 0.1mm |
| Depth | 0.1mm |
Compliance
| Manufacturer part number (MPN) | 87186828390 |
|---|---|
| GC number | J04-468 |
| Barcode / EAN | 4047416333700 |
| Commodity code | 8481 80 90 00 |
| GPC classification | Valves/Fittings - Water and Gas |
| Alternative numbers | MOTOR-DIVERTER-VALVE, 1031019 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 25SI COMPACT LPG | 47-406-51 | 47-406-51 | — | — |
| WORCESTER GREENSTAR 25SI COMPACT NG | 47-406-50 | 47-406-50 | — | — |
| WORCESTER GREENSTAR 25Si ErP COMPACT LPG | 47-407-74 | 47-407-74 | — | — |
| WORCESTER GREENSTAR 25Si ErP COMPACT NG | 47-406-73 | 47-406-73 | — | — |
| WORCESTER GREENSTAR 25i ErP COMBI LPG | 47-406-61 | 47-406-61 | — | — |
| WORCESTER GREENSTAR 25i ErP COMBI NG | 47-406-60 | 47-406-60 | — | — |
| WORCESTER GREENSTAR 28 CDI COMPACT LPG | 47-406-45 | 47-406-45 | — | — |
| WORCESTER GREENSTAR 28 CDI COMPACT NG | 47-406-44 | 47-406-44 | — | — |
| WORCESTER GREENSTAR 28CDi ErP COMPACT LPG | 47-406-78 | 47-406-78 | — | — |
| WORCESTER GREENSTAR 28CDi ErP COMPACT NG | 47-406-77 | 47-406-77 | — | — |
Showing 10 of 144 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
WORCESTER appliance manual — GREENSTAR 25SI COMPACT LPG (GC 47-406-51), GREENSTAR 25SI COMPACT NG (GC 47-406-50), GREENSTAR 30 SI COMPACT LPG (GC 47-406-53), GREENSTAR 30 SI COMPACT NG (GC 47-406-52)
manualmanualWORCESTER appliance manual — GREENSTAR 25Si ErP COMPACT LPG (GC 47-407-74), GREENSTAR 25Si ErP COMPACT NG (GC 47-406-73), GREENSTAR 28Si ErP COMPACT, GREENSTAR 30Si ErP COMPACT LPG (GC 47-406-76), GREENSTAR 30Si ErP COMPACT NG (GC 47-406-75)
manualmanualWORCESTER appliance manual — GREENSTAR 25i ErP COMBI LPG (GC 47-406-61), GREENSTAR 25i ErP COMBI NG (GC 47-406-60), GREENSTAR 30i ErP COMBI LPG (GC 47-406-63), GREENSTAR 30i ErP COMBI NG (GC 47-406-62)
manualmanualWORCESTER appliance manual — GREENSTAR 28 CDI COMPACT LPG (GC 47-406-45), GREENSTAR 28 CDI COMPACT NG (GC 47-406-44)
manualmanualWORCESTER appliance manual — GREENSTAR 28CDi ErP COMPACT LPG (GC 47-406-78), GREENSTAR 28CDi ErP COMPACT NG (GC 47-406-77), GREENSTAR 32CDi ErP COMPACT LPG (GC 47-406-80), GREENSTAR 32CDi ErP COMPACT NG (GC 47-406-79), GREENSTAR 36CDi ErP COMPACT LPG (GC 47-406-82), GREENSTAR 36CDi ErP COMPACT NG (GC 47-406-81)
manualmanualWORCESTER appliance manual — GREENSTAR 32CDI COMPACT LPG (GC 47-406-47), GREENSTAR 32CDI COMPACT NG (GC 47-406-46), GREENSTAR 36CDI COMPACT LPG (GC 47-406-49), GREENSTAR 36CDI COMPACT NG (GC 47-406-48)
manualmanualWORCESTER appliance manual — GREENSTAR 8000 LIFE COMBI GR8300iW 30 C LPG, GREENSTAR 8000 LIFE COMBI GR8300iW 30 C NG (GC 47-800-18), GREENSTAR 8000 LIFE COMBI GR8300iW 35 C LPG, GREENSTAR 8000 LIFE COMBI GR8300iW 35 C NG (GC 47-800-17), GREENSTAR 8000 LIFE COMBI GR8300iW 40 C LPG, GREENSTAR 8000 LIFE COMBI GR8300iW 40 C NG (GC 47-800-16), GREENSTAR 8000 LIFE COMBI GR8300iW 45 C LPG, GREENSTAR 8000 LIFE COMBI GR8300iW 45 C NG (GC 47-800-15), GREENSTAR 8000 LIFE COMBI GR8300iW 50 C LPG, GREENSTAR 8000 LIFE COMBI GR8300iW 50 C NG (GC 47-800-14), GREENSTAR LIFE GR8300iW 30 C LPG, GREENSTAR LIFE GR8300iW 30 C NG (GC 47-800-18), GREENSTAR LIFE GR8300iW 35 C LPG, GREENSTAR LIFE GR8300iW 35 C NG (GC 47-800-17), GREENSTAR LIFE GR8300iW 40 C LPG, GREENSTAR LIFE GR8300iW 40 C NG (GC 47-800-16), GREENSTAR LIFE GR8300iW 45 C LPG, GREENSTAR LIFE GR8300iW 45 C NG (GC 47-800-15), GREENSTAR LIFE GR8300iW 50 C LPG, GREENSTAR LIFE GR8300iW 50 C NG (GC 47-800-14)
manualmanualWORCESTER appliance manual — GREENSTAR 8000+ STYLE COMBI GR8700iW 30 C LPG, GREENSTAR 8000+ STYLE COMBI GR8700iW 30 C NG (GC 47-800-03), GREENSTAR 8000+ STYLE COMBI GR8700iW 30 CB LPG, GREENSTAR 8000+ STYLE COMBI GR8700iW 30 CB NG (GC 47-406-97), GREENSTAR 8000+ STYLE COMBI GR8700iW 35 C LPG, GREENSTAR 8000+ STYLE COMBI GR8700iW 35 C NG (GC 47-800-02), GREENSTAR 8000+ STYLE COMBI GR8700iW 35 CB LPG, GREENSTAR 8000+ STYLE COMBI GR8700iW 35 CB NG (GC 47-406-96), GREENSTAR 8000+ STYLE COMBI GR8700iW 40 C LPG, GREENSTAR 8000+ STYLE COMBI GR8700iW 40 C NG (GC 47-800-01), GREENSTAR 8000+ STYLE COMBI GR8700iW 40 CB LPG, GREENSTAR 8000+ STYLE COMBI GR8700iW 40 CB NG (GC 47-406-95), GREENSTAR 8000+ STYLE COMBI GR8700iW 45 C LPG, GREENSTAR 8000+ STYLE COMBI GR8700iW 45 C NG (GC 47-406-99), GREENSTAR 8000+ STYLE COMBI GR8700iW 45 CB LPG, GREENSTAR 8000+ STYLE COMBI GR8700iW 45 CB NG (GC 47-406-94), GREENSTAR 8000+ STYLE COMBI GR8700iW 50 C LPG, GREENSTAR 8000+ STYLE COMBI GR8700iW 50 C NG (GC 47-406-98), GREENSTAR 8000+ STYLE COMBI GR8700iW 50 CB LPG, GREENSTAR 8000+ STYLE COMBI GR8700iW 50 CB NG (GC 47-406-93), GREENSTAR STYLE GR8700iW 30 C LPG, GREENSTAR STYLE GR8700iW 30 C NG (GC 47-800-03), GREENSTAR STYLE GR8700iW 30 CB LPG, GREENSTAR STYLE GR8700iW 30 CB NG (GC 47-406-97), GREENSTAR STYLE GR8700iW 35 C LPG, GREENSTAR STYLE GR8700iW 35 C NG (GC 47-800-02), GREENSTAR STYLE GR8700iW 35 CB LPG, GREENSTAR STYLE GR8700iW 35 CB NG (GC 47-406-96), GREENSTAR STYLE GR8700iW 40 C LPG, GREENSTAR STYLE GR8700iW 40 C NG (GC 47-800-01), GREENSTAR STYLE GR8700iW 40 CB LPG, GREENSTAR STYLE GR8700iW 40 CB NG (GC 47-406-95), GREENSTAR STYLE GR8700iW 45 C LPG, GREENSTAR STYLE GR8700iW 45 C NG (GC 47-406-99), GREENSTAR STYLE GR8700iW 45 CB LPG, GREENSTAR STYLE GR8700iW 45 CB NG (GC 47-406-94), GREENSTAR STYLE GR8700iW 50 C LPG, GREENSTAR STYLE GR8700iW 50 C NG (GC 47-406-98), GREENSTAR STYLE GR8700iW 50 CB LPG, GREENSTAR STYLE GR8700iW 50 CB NG (GC 47-406-93)
manualmanualWORCESTER appliance manual — GREENSTAR HEATSLAVE II 12/18 ErP, GREENSTAR HEATSLAVE II 18/25 ErP, GREENSTAR HEATSLAVE II 25/32 ErP
manualmanualWORCESTER appliance manual — GREENSTAR HEATSLAVE II EXT 12/18 ErP, GREENSTAR HEATSLAVE II EXT 18/25 ErP, GREENSTAR HEATSLAVE II EXT 25/32 ErP
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