Description

Worcester Turbine Flow Sensor 87170021320 (Before FD076)

The Worcester Turbine Flow Sensor 87170021320 helps your boiler detect water flow accurately, so it can support steady hot water performance and efficient operation. However, when the sensor becomes faulty, the boiler may struggle to respond correctly to demand, which can lead to poor hot water delivery. Therefore, replacing it with this brand new part helps restore correct flow detection and more reliable everyday performance.

Compatible Boilers

This part is compatible with the following models:

HIU

• Hiu – GC No. 7733600141

Compact Series

• 533 Compact – GC No. 47-406-58
• 533 Compact ErP – GC No. 47-406-83
• 535 Compact – GC No. 47-406-59
• 535 Compact ErP – GC No. 47-406-84

FSN GB Series

• 24 Fsn Gb – GC No. 47-406-32
• 28 Fsn Gb – GC No. 47-406-33

Greenstar CDI Compact Series

• 28 CDI Compact – GC No. 47-406-44
• 28 CDI Compact LPG – GC No. 47-406-45
• 32 CDI Compact – GC No. 47-406-46
• 32 CDI Compact LPG – GC No. 47-406-47
• 36 CDI Compact – GC No. 47-406-48
• 36 CDI Compact LPG – GC No. 47-406-49

Greenstar CDI Compact ErP Series

• 28 CDI Compact ERP – GC No. 47-406-77
• 28 CDI Compact ERP LPG – GC No. 47-406-78
• 32 CDI Compact ERP – GC No. 47-406-79
• 32 CDI Compact ERP LPG – GC No. 47-406-80
• 36 CDI Compact ERP – GC No. 47-406-81
• 36 CDI Compact ERP LPG – GC No. 47-406-82

Greenstar Highflow Series

• Highflow 440 – GC No. 47-311-82
• Highflow 550 CDI – GC No. 47-406-25

Greenstar SI Compact Series

• 25 SI Compact – GC No. 47-406-50
• 25 SI Compact LPG – GC No. 47-406-51
• 30 SI Compact NG – GC No. 47-406-52
• 30 SI Compact LPG – GC No. 47-406-53

Greenstar SI Compact ErP Series

• 25 SI Compact ERP – GC No. 47-406-73
• 25 SI Compact ERP LPG – GC No. 47-406-74
• 30 SI Compact ERP – GC No. 47-406-75
• 30 SI Compact ERP LPG – GC No. 47-406-76

Heatslave II Series

• 12/18 (2022) – Ref. 7731600260
• 12/18 – Ref. 7716100129
• 12/18 ERP – Ref. 7731600047
• 12/18 ERP+ – Ref. 7731600165
• 18/25 (2022) – Ref. 7731600261
• 18/25 – Ref. 7716100130
• 18/25 ERP – Ref. 7731600048
• 18/25 ERP+ – Ref. 7731600166
• 25/32 (2022) – Ref. 7731600262
• 25/32 – Ref. 7716100131
• 25/32 ERP – Ref. 7731600049
• 25/32 ERP+ – Ref. 7731600167

Heatslave II External Series

• 12/18 External (2022) – Ref. 7731600263
• 12/18 External – Ref. 7716100138
• 18/25 External (2022) – Ref. 7731600264
• 18/25 External – Ref. 7716100139
• 25/32 External (2022) – Ref. 7731600265
• 25/32 External – Ref. 7716100140
• Ext 12/18 ErP – Ref. 7731600050
• Ext 18/25 ErP – Ref. 7731600051
• Ext 25/32 ErP – Ref. 7731600052
• External 12/18 ERP+ – Ref. 7731600168
• External 18/25 ERP+ – Ref. 7731600169
• External 25/32 ERP+ – Ref. 7731600170

Why Choose This Product?

This brand new Worcester flow sensor helps restore accurate water flow detection and reliable hot water performance. In addition, it fits a wide range of selected Worcester and Heatslave boilers, so it gives you a practical replacement option with a 12-month warranty.

Delivery and Return

Order before 1 PM for same-day dispatch, with standard and next-day delivery options available. Returns are accepted within 30 days if the part is unused and in its original packaging. However, always use a Gas Safe registered engineer for installation and warranty support.

Frequently Asked Questions

1. What does the turbine flow sensor do in the boiler?
The turbine flow sensor monitors water movement inside the boiler, so the appliance can respond properly to hot water demand. Therefore, it plays an important role in smooth hot water performance and correct system operation.

2. What problems can a faulty flow sensor cause?
A faulty sensor can reduce hot water response or stop the boiler from detecting flow correctly. As a result, you may notice inconsistent hot water performance or poor reaction when demand starts.

3. Is this part compatible with Greenstar Compact boilers?
Yes, this sensor fits selected Greenstar Compact, CDI Compact, SI Compact and Highflow models listed above. However, always match the part number and boiler model before ordering to avoid compatibility issues.

4. Does this part fit Heatslave II boilers?
Yes, it also fits selected Heatslave II and Heatslave II External models shown in the compatibility section. Therefore, it can suit both internal and external versions where the reference matches.

5. Is this part brand new?
Yes, this Worcester turbine flow sensor is supplied in brand new condition. In addition, it comes with a 12-month warranty for extra peace of mind.