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Worcester Bosch Temperature Sensor NTC 4000mm 8738203392

Worcester Bosch

Worcester Bosch Temperature Sensor NTC 4000mm 8738203392

Worcester Bosch NTC temperature sensor with a 4000mm lead and Molex connector for Greenstore boilers.

At a glance

  • Also known as TEMPERATURE-SENSOR-NTC-4000MM, 1022491
Manufacturer part no.
8738203392
Showing prices

£73.03

£60.86 ex. VAT · VAT at 20%

Available to order · 7 working days
Available to order · 7 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 Temperature sensor NTC 4000mm is a Worcester Bosch negative temperature coefficient thermistor used to measure water temperature within the appliance. It is supplied with a 4000mm lead and a Molex connector, and is listed for use across the Greenstore combi and system boiler range.

Signs this part needs replacing

  • Boiler locks out or displays a temperature-related fault code
  • Flow or return temperature readings that are implausible or erratic
  • Domestic hot water running hot and cold instead of holding a steady temperature
  • Sensor resistance readings outside the expected range for the measured water temperature
  • Visible damage, corrosion or a broken connector on the sensor or its lead

Before you order

  • Confirm the appliance model and variant against the fit list above, as Greenstore combi and system models differ
  • Check the existing sensor connector type and lead routing before removing it
  • Verify the fault is sensor-related rather than a wiring or control board issue
  • Compare the part number on the existing sensor with 8738203392

Not sure which part?

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