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.
£46.80
£39.00 ex. VAT · VAT at 20%
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.
Mechanical
| Part type | Thermostats, Thermistors & Sensors |
|---|---|
| Length | 0.1mm |
| Width | 0.1mm |
| Depth | 0.1mm |
Compliance
| Manufacturer part number (MPN) | 720777001 |
|---|---|
| GC number | H90-608 |
| Barcode / EAN | 720777001 |
| Commodity code | 8533 40 00 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters |
| Alternative numbers | NTC-SENSOR-DHW, 1119856, N6883 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| BAXI 124 ErP COMBI - SERIAL NUMBER ENDING AC | 47-077-25 | 47-077-25 | — | — |
| BAXI 124 ErP COMBI - SERIAL NUMBER ENDING BC | 47-077-25 | 47-077-25 | — | — |
| BAXI 128 ErP COMBI - SERIAL NUMBER ENDING AC | 47-077-26 | 47-077-26 | — | — |
| BAXI 128 ErP COMBI - SERIAL NUMBER ENDING BC | 47-077-26 | 47-077-26 | — | — |
| BAXI BAXI 124 ErP COMBI - SERIAL NUM ENDING BC | — | — | — | |
| BAXI BAXI 128 ErP COMBI - SERIAL NUM ENDING BC | — | — | — | |
| BAXI BAXI NETA-TEC COMBI 24 GA | — | — | — | |
| BAXI BAXI NETA-TEC COMBI 28 GA | — | — | — | |
| BAXI BAXI NETA-TEC COMBI 33 GA | — | — | — | |
| BAXI BAXI NETA-TEC PLUS COMBI 24 GA | — | — | — |
Showing 10 of 31 compatible appliances.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
BAXI appliance manual — 124 ErP COMBI - SERIAL NUMBER ENDING AC (GC 47-077-25), 124 ErP COMBI - SERIAL NUMBER ENDING BC (GC 47-077-25), 128 ErP COMBI - SERIAL NUMBER ENDING AC (GC 47-077-26), 128 ErP COMBI - SERIAL NUMBER ENDING BC (GC 47-077-26)
manualmanualBAXI appliance manual — DUO-TEC 2 COMBI 28 COMPACT (GC 47-075-72)
manualmanualBAXI appliance manual — ECOBLUE COMBI 24 (GC 47-075-81), ECOBLUE COMBI 28 (GC 47-075-82), ECOBLUE COMBI 33 (GC 47-075-83)
manualmanualBAXI appliance manual — ECOBLUE COMBI ErP 24 (GC 47-077-11), ECOBLUE COMBI ErP 28 (GC 47-077-12), ECOBLUE COMBI ErP 33 (GC 47-077-13)
manualmanualBAXI appliance manual — ECOBLUE PLUS COMBI 24 (GC 47-075-84), ECOBLUE PLUS COMBI 28 (GC 47-075-85), ECOBLUE PLUS COMBI 33 (GC 47-075-86)
manualmanualBAXI appliance manual — ECOBLUE PLUS COMBI ErP 24 (GC 47-077-08), ECOBLUE PLUS COMBI ErP 28 (GC 47-077-09), ECOBLUE PLUS COMBI ErP 33 (GC 47-077-10)
manualmanualBAXI appliance manual — NETA-TEC COMBI 24 GA (GC 47-075-51), NETA-TEC COMBI 28 GA (GC 47-075-52), NETA-TEC COMBI 33 GA (GC 47-075-53)
manualmanualBAXI appliance manual — NETA-TEC PLUS COMBI 24 GA (GC 47-075-64), NETA-TEC PLUS COMBI 28 GA (GC 47-075-65), NETA-TEC PLUS COMBI 33 GA (GC 47-075-66)
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