Worcester Bosch
Worcester Bosch Temperature Limiter 871860304A0
Worcester Bosch temperature limiter thermostat, part 871860304A0, for Greenstar Si Compact and i Compact System boilers.
At a glance
- Part type: Thermostats, thermistors and sensors
- Appliance family: Worcester Greenstar
- Also known as 1030917
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Showing prices
£6.20
£5.17 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 temperature limiter (part 871860304A0) is a safety thermostat used across the Greenstar range of condensing boilers. It monitors temperature at its sensing point and interrupts the burner circuit if the limit is exceeded, protecting the heat exchanger and surrounding components from overheating. It is listed by the manufacturer under thermostats, thermistors and sensors.
Signs this part needs replacing
- The boiler locks out or shuts down shortly after the burner fires, particularly once the appliance has reached operating temperature.
- Repeated overheat trips that clear on reset but return once the boiler runs again.
- No heating or hot water because the burner circuit is held open by the limiter.
- Erratic or intermittent operation that does not correlate with demand from the programmer or thermostat.
- A fault code or lockout pattern consistent with an overheat condition on the appliance display.
Before you order
- Check the GC number on the appliance data badge against the compatibility list to confirm the correct variant.
- Confirm the existing part number and any alternative number 1030917 before ordering.
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Mechanical
| Part type | Thermostats, Thermistors & Sensors |
|---|---|
| Appliance family | Worcester Greenstar |
Compliance
| Manufacturer part number (MPN) | 871860304A0 |
|---|---|
| Barcode / EAN | 4051516270025 |
| Commodity code | 9032 10 00 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Alternative numbers | 1030917 |
| 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 27I COMPACT SYSTEM LPG | 41-406-14 | 41-406-14 | — | — |
| WORCESTER GREENSTAR 27I COMPACT SYSTEM NG | 41-406-13 | 41-406-13 | — | — |
| WORCESTER GREENSTAR 27Ri ErP COMPACT LPG | 41-406-55 | 41-406-55 | — | — |
| WORCESTER GREENSTAR 27Ri ErP COMPACT NG | 41-406-54 | 41-406-54 | — | — |
| WORCESTER GREENSTAR 27i ErP SYSTEM COMPACT LPG | 41-406-59 | 41-406-59 | — | — |
| WORCESTER GREENSTAR 27i ErP SYSTEM COMPACT NG | 41-406-58 | 41-406-58 | — | — |
Showing 10 of 71 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 27I COMPACT SYSTEM LPG (GC 41-406-14), GREENSTAR 27I COMPACT SYSTEM NG (GC 41-406-13), GREENSTAR 30I COMPACT SYSTEM LPG (GC 41-406-16), GREENSTAR 30I COMPACT SYSTEM NG (GC 41-406-15)
manualmanualWORCESTER appliance manual — GREENSTAR 27Ri ErP COMPACT LPG (GC 41-406-55), GREENSTAR 27Ri ErP COMPACT NG (GC 41-406-54), GREENSTAR 30Ri ErP COMPACT LPG (GC 41-406-57), GREENSTAR 30Ri ErP COMPACT NG (GC 41-406-56)
manualmanualWORCESTER appliance manual — GREENSTAR 27i ErP SYSTEM COMPACT LPG (GC 41-406-59), GREENSTAR 27i ErP SYSTEM COMPACT NG (GC 41-406-58), GREENSTAR 30i ErP SYSTEM COMPACT LPG (GC 41-406-61), GREENSTAR 30i ErP SYSTEM COMPACT NG (GC 41-406-60)
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 RI 27KW COMPACT LPG (GC 41-406-18), GREENSTAR RI 27KW COMPACT NG (GC 41-406-17), GREENSTAR Ri 30KW COMPACT LPG (GC 41-406-20), GREENSTAR Ri 30KW COMPACT NG (GC 41-406-19)
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