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Worcester Bosch Flue Thermostat 87186823970

Worcester Bosch

Worcester Bosch Flue Thermostat 87186823970

Worcester Bosch flue thermostat 87186823970 for Greenstar oil boilers, monitoring flue temperature for safe, efficient operation.

At a glance

  • Part type: Thermostat
  • Also known as 1022678
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
87186823970
Showing prices

£67.07

£55.89 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 87186823970 is a flue thermostat used on Greenstar oil boilers. It senses flue gas temperature and passes that reading to the boiler controls, so combustion stays within safe limits and the appliance runs efficiently. It sits in the thermostats, thermistors and sensors spare part group.

Signs this part needs replacing

  • Boiler locks out or shuts down during or shortly after firing
  • Overheat or flue temperature faults recorded by the controls
  • Burner cutting in and out with short, uneven run times
  • Fault codes linked to flue or temperature sensing
  • Unstable or erratic temperature readings reaching the control board

Before you order

  • Confirm the boiler model and serial number against the compatibility list.
  • Match part number 87186823970 or alternative number 1022678 to the marking on the existing component.
  • Check any gasket or seal disturbed during removal and order it separately if it needs renewing.
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.