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Potterton NTC Sensor QAK37.596/H 5138662

Potterton

Potterton NTC Sensor QAK37.596/H 5138662

NTC thermistor temperature sensor for Potterton Commercial Sirius SAT boilers.

Manufacturer part no.
5138662
Showing prices

£19.20

£16.00 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 NTC SENSOR SIEMENS QAK37.596/H is an NTC thermistor temperature sensor used on Potterton Commercial boilers. It is listed under thermistors and gas boiler spares, and provides temperature feedback to the appliance control. The Potterton part number for this sensor is 5138662.

Signs this part needs replacing

  • The boiler displays a temperature-related fault code or locks out.
  • Central heating or hot water temperature readings are inaccurate or erratic.
  • The boiler short cycles or modulates poorly because temperature feedback is incorrect.
  • The sensor resistance reading does not change as expected when its temperature is varied during testing.
  • Stored fault history repeatedly points to a temperature sensor fault.

Before you order

  • Confirm the appliance model is a Potterton Commercial Sirius SAT R2Z, Ra2Z or Rs2Z.
  • Check the existing sensor against the Siemens reference QAK37.596/H and Potterton part number 5138662.
  • Confirm the connector and mounting arrangement match the sensor being removed.
  • Isolate the electrical supply and any necessary water supply before fitting.

Not sure which part?

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