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Baxi NTC Sensor Domestic Hot Water 720777001

Baxi

Baxi NTC Sensor Domestic Hot Water 720777001

Baxi domestic hot water NTC sensor (720777001) for ErP Combi models, monitoring DHW temperature via a resistance change read by the PCB.

At a glance

  • Part type: NTC sensor (thermistor)
  • Also known as 1119856, N6883
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
720777001
GC number
H90-608
Showing prices

£46.80

£39.00 ex. VAT · VAT at 20%

Available to order · 1-2 working days
Available to order · 1-2 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Baxi domestic hot water NTC sensor, part number 720777001, is a negative temperature coefficient thermistor that monitors the temperature of the domestic hot water circuit. Its resistance falls as temperature rises, and the printed circuit board passes a small current through it to read that change and control the appliance accordingly. It is a replacement component for Baxi ErP Combi appliances.

Signs this part needs replacing

  • Domestic hot water runs hot then cold, or the outlet temperature drifts without the tap being adjusted
  • The appliance does not recognise a hot water demand and fails to fire for DHW
  • A fault code or lockout linked to the domestic hot water sensor appears on the display
  • A resistance reading taken across the sensor falls outside the expected value for the measured water temperature
  • Hot water production becomes intermittent, with the boiler cutting in and out during a draw-off

Before you order

  • Check the appliance GC number and serial number against the compatibility list to confirm the sensor suits your model
  • Compare the numbers marked on the original component with the alternative part numbers listed below
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.

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.