Worcester Bosch
Worcester Bosch Control Unit Greenstar CDi 87377031970
Replacement Worcester Bosch control unit, part 87377031970, for Greenstar 30CDi and 40CDi gas boilers.
At a glance
- Part type: Control unit (control box)
- Appliance family: Greenstar CDi
- Also known as 1020398
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
AvailabilityCall for price
Availability: no longer made. Call us and we'll check for stock.
No longer made: call us
The manufacturer has discontinued this part. Our team will check for remaining stock or a suitable replacement.
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Unused, in original packaging.
What it is
The Worcester Bosch 87377031970 is a replacement control unit for Worcester Bosch Greenstar CDi gas boilers. It sits within the boiler's control box assembly and carries the electronics that govern the appliance's operating sequence, linking the user controls, sensors and safety devices. It is supplied as a serviceable spare for the Greenstar 30CDi and 40CDi families, covering conventional and ErP Classic Regular variants in both natural gas and LPG formats.
Signs this part needs replacing
- The boiler does not respond to the room thermostat, programmer or front panel controls.
- No ignition sequence is initiated, or the appliance locks out repeatedly with no fault found elsewhere.
- The fascia display is blank, flickering or showing erratic readings.
- The boiler runs intermittently or shuts down at random during a demand for heat.
- Visible heat damage, moisture ingress or burnt components on the control board.
Before you order
- Check the appliance GC number and serial number against the compatibility list before ordering, as this unit covers both 30CDi and 40CDi variants.
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
- Cross-reference the alternative part number 1020398 when checking older stock records or existing documentation.
Mechanical
| Part type | Control unit (control box) |
|---|---|
| Appliance family | Greenstar CDi |
Compliance
| Manufacturer part number (MPN) | 87377031970 |
|---|---|
| GC number | J00-975 |
| Barcode / EAN | 4051516723187 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Alternative numbers | 1020398 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 30CDI CONVENTIONAL LPG | 41-311-73 | 41-311-73 | — | — |
| WORCESTER GREENSTAR 30CDI CONVENTIONAL NG | 41-311-71 | 41-311-71 | — | — |
| WORCESTER GREENSTAR 30CDI ErP CLASSIC REGULAR LPG | 41-406-34 | 41-406-34 | — | — |
| WORCESTER GREENSTAR 30CDI ErP CLASSIC REGULAR NG | 41-406-33 | 41-406-33 | — | — |
| WORCESTER GREENSTAR 40CDI CONVENTIONAL LPG | 41-311-74 | 41-311-74 | — | — |
| WORCESTER GREENSTAR 40CDI CONVENTIONAL NG | 41-311-72 | 41-311-72 | — | — |
| WORCESTER GREENSTAR 40CDI ErP CLASSIC REGULAR LPG | 41-406-36 | 41-406-36 | — | — |
| WORCESTER GREENSTAR 40CDI ErP CLASSIC REGULAR NG | 41-406-35 | 41-406-35 | — | — |
| WORCESTER WORCESTER GREENSTAR 30CDI ErP CLASSIC REGULAR LPG | — | — | — | |
| WORCESTER WORCESTER GREENSTAR 30CDI ErP CLASSIC REGULAR NG | — | — | — |
Showing 10 of 12 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 30CDI CONVENTIONAL LPG (GC 41-311-73), GREENSTAR 30CDI CONVENTIONAL NG (GC 41-311-71), GREENSTAR 40CDI CONVENTIONAL LPG (GC 41-311-74), GREENSTAR 40CDI CONVENTIONAL NG (GC 41-311-72)
manualmanualWORCESTER appliance manual — GREENSTAR 30CDI ErP CLASSIC REGULAR LPG (GC 41-406-34), GREENSTAR 30CDI ErP CLASSIC REGULAR NG (GC 41-406-33), GREENSTAR 40CDI ErP CLASSIC REGULAR LPG (GC 41-406-36), GREENSTAR 40CDI ErP CLASSIC REGULAR NG (GC 41-406-35)
manualNo technical questions yet for this part.
Not sure which part?
Tell the parts assistant what it's going into — the appliance make and model, or the GC number off the data badge — and it will check this part is on the fit list.