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5pcs 5K 10K 15K 20K 25K 50K 100K air conditioning temperature sensor Cooper Head
5pcs 5K 10K 15K 20K 25K 50K 100K air conditioning temperature sensor Cooper Head
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Copper-head NTC temperature sensors built for air conditioner coil & pipe sensing. Copper bullet tip reacts faster than epoxy heads, which makes it the right choice for evaporator and condenser tube temperature detection.
- 7 resistance values in one set: 5K, 10K, 15K, 20K, 25K, 50K, 100K
- Sensor type: NTC thermistor, negative temperature coefficient
- Head material: copper bullet, 6 × 15 mm (confirm before ordering)
- Tolerance: ±1% / ±3% / ±5% (confirm with listing)
- Cable length: 400 mm / 40 cm, 2-wire lead
- Operating range: -40 ℃ to +125 ℃
Resistance Value Reference
| Rated Resistance (25 ℃) | Common B Value | Typical Use |
|---|---|---|
| 5KΩ | 3470K / 3950K | Older Gree & Midea coil sensing |
| 10KΩ | 3950K | Most common — Daikin, Gree, Haier, Midea |
| 15KΩ | 3950K | Toshiba / Carrier indoor units |
| 20KΩ | 3950K | Chigo, Aux, some inverter boards |
| 25KΩ | 3950K | Commercial &light commercial units |
| 50KΩ | 3950K | VRF systems, heat pump water heaters |
| 100KΩ | 3950K / 4100K | Panasonic, Samsung, LG inverter boards |
Copper Head vs Epoxy Head — Which Do You Need?
| Type | Where It Goes | Reaction Speed |
|---|---|---|
| Copper head (this item) | Clamped to copper pipe — coil / pipe temperature | Fast |
| Epoxy / plastic head | Exposed to airflow — room ambient temperature | Slower |
How to Confirm the Right Resistance Before Ordering
- Power off and unplug the unit, then locate the sensor clipped to the copper pipe near the coil.
- Unplug its connector and measure across the two wires with a multimeter set to 20KΩ or 200KΩ.
- Compare the reading at roughly 25 ℃ / 77 ℉ against the table above — the closest standard value is your replacement.
- If the reading is unstable, jumps around, or shows OL / open circuit, the sensor has failed and needs replacing.
FAQ
Q: Will a 10K sensor work if my original is 5K?
No. Swapping resistance values shifts the whole temperature curve — you will get wrong readings, short cycling, or fault codes. Always match the original rating and B value.
Q: Why does my AC show an F0 / E2 / E4 error?
These codes on most Gree, Midea and Aux units point to coil or ambient sensor fault. Test the sensor resistance first before replacing the control board.
Q: Can I extend the cable?
Yes, solder and heat-shrink any extra length, but keep total added length under 2 m to avoid signal drift on long inverter-board runs.
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