Worcester Bosch
Worcester Bosch Printed Circuit Board Greenstar i Series 8748300921
At a glance
- Also known as 2248707
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
£144.02
£120.02 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 Worcester Bosch 8748300921 is a printed circuit board (PCB) for Greenstar i Series gas boilers, supplied under board reference U20805. It is the main control board, handling the ignition sequence, fan and pump control, gas valve operation, temperature sensing and the boiler's safety interlocks. It is a direct replacement item for the listed appliances built after the stated factory dates.
Signs this part needs replacing
- The boiler fails to fire, or locks out repeatedly after reset
- A blank, dim or erratic display on the boiler control panel
- Fault codes relating to the board, ignition sequence or sensor inputs
- The fan, pump or gas valve is not being driven when demanded
- Heating or hot water cuts out mid-cycle, or runs intermittently
Before you order
- Check the GC number and the appliance serial/FD number against the compatibility list; this board suits System models after FD 988 and Junior Combi models after FD 990.
- Compare the part number printed on the existing board with 8748300921 and the previous numbers listed below.
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Mechanical
| Part type | Printed Circuit Board (PCB) |
|---|
Compliance
| Manufacturer part number (MPN) | 8748300921 |
|---|---|
| GC number | 727-479 |
| Commodity code | 8537 10 00 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Alternative numbers | WB8748300921, 8-748-300-634-0, 8-748-300-650-0, 8-748-300-713-0, 87483008680, 2248707 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 12i SYSTEM LPG | 41-311-69 | 41-311-69 | — | — |
| WORCESTER GREENSTAR 12i SYSTEM NG | 41-311-67 | 41-311-67 | — | — |
| WORCESTER GREENSTAR 15I SYSTEM LPG | 41-406-26 | 41-406-26 | — | — |
| WORCESTER GREENSTAR 15I SYSTEM NG | 41-311-84 | 41-311-84 | — | — |
| WORCESTER GREENSTAR 18I SYSTEM LPG | 41-311-87 | 41-311-87 | — | — |
| WORCESTER GREENSTAR 18I SYSTEM NG | 41-311-86 | 41-311-86 | — | — |
| WORCESTER GREENSTAR 24I JUNIOR NG | 47-311-86 | 47-311-86 | — | — |
| WORCESTER GREENSTAR 24i JUNIOR LPG | 47-311-90 | 47-311-90 | — | — |
| WORCESTER GREENSTAR 24i SYSTEM LPG | 41-311-70 | 41-311-70 | — | — |
| WORCESTER GREENSTAR 24i SYSTEM NG | 41-311-68 | 41-311-68 | — | — |
Showing 10 of 16 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.
WORCESTER appliance manual — GREENSTAR 12i SYSTEM LPG (GC 41-311-69), GREENSTAR 12i SYSTEM NG (GC 41-311-67), GREENSTAR 15I SYSTEM LPG (GC 41-406-26), GREENSTAR 15I SYSTEM NG (GC 41-311-84), GREENSTAR 18I SYSTEM LPG (GC 41-311-87), GREENSTAR 18I SYSTEM NG (GC 41-311-86), GREENSTAR 24i SYSTEM LPG (GC 41-311-70), GREENSTAR 24i SYSTEM NG (GC 41-311-68)
manualmanualWORCESTER appliance manual — GREENSTAR 24I JUNIOR NG (GC 47-311-86), GREENSTAR 24i JUNIOR LPG (GC 47-311-90), GREENSTAR 28i JUNIOR LPG (GC 47-311-91), GREENSTAR 28i JUNIOR NG (GC 47-311-87)
manualmanualWORCESTER appliance manual — GREENSTAR 25SI COMBI LPG (GC 47-311-88), GREENSTAR 25SI COMBI NG (GC 47-311-84), GREENSTAR 30 SI COMBI LPG (GC 47-311-89), GREENSTAR 30 SI COMBI NG (GC 47-311-85)
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