Plumbing, Heating & Boiler Parts
Technical review: 2026-08-20
Boiler NTC Thermistors & Temperature Sensors
Source genuine primary flow, return, and domestic hot water (DHW) NTC temperature thermistors. Clear intermittent temperature faults and overheat errors.
Where to Find Your Model or Part Number
To guarantee 100% compatibility, check these standard locations for model badges, OEM stampings, and serial numbers:
- Gas Council GC number on boiler; stamped color code on plastic thermistor head.
Frequently Replaced Components & Spares
Clip-On Pipe NTC Thermistors
Spring clip sensors measuring 15mm and 22mm copper pipe surface temperatures
Wet Pocket Immersion Thermistors
Threaded probe thermistors immersed directly into boiler waterways
Common Symptoms & Fault Diagnostics
| Observed Symptom | Likely Root Cause | Recommended Action |
|---|---|---|
| Boiler temperature gauge jumps erratically or locks out with temperature sensor fault code | Internal thermistor resistor drifted out of calibration resistance range (should typically read 10kΩ at 25°C) | Inspect and replace faulty component. |
Compatibility Verification Checklist
Before ordering replacement components, verify these technical specifications to avoid returns:
Confirm whether sensor is Clip-On (dry) or Immersion Probe (wet).
How to Photograph Your Part for AI Identification
- 1Photograph the thermistor connector and pipe mounting location.
Safety & Legal Compliance Notice
Ensure a Gas Safe registered professional tests and certifies heating system sensors.