Photo may vary slightly — verify by part number before ordering.12P505B03 — WaterFurnace FP1RK01 Kit-Thermistor Freeze Sensor Yellow 84
WaterFurnace has discontinued part 12P505B03.
Replaced by: 12P560-05
Order replacement 12P560-05 — contact us →Overview
WaterFurnace 12P505B03 — FP1RK01 Kit-Thermistor Freeze Sensor Yellow 84. A sensor or thermistor reports temperature or another condition to the controller as an electrical signal.
Discontinued — replaced by 12P560-05. WaterFurnace no longer supplies 12P505B03; order the direct factory replacement 12P560-05 instead.
Fits these WaterFurnace units: NDH026B101CSL, NDH026B101CSR, NDH038A101CER, NDH038B111NSL, NDH049A111NSR, NDH072A101NEL, NDV026B101CTR, NDV038A101CTR, NDV038A111CTL, NDV038A111NTL, NDV038B111NTR, NDV049A101NTL and 21 more (33 models; the Fits These Units list below is complete). These are the units we've confirmed — not necessarily the only ones. Send us the model and serial number if yours isn't listed.
Genuine WaterFurnace OEM part — not an aftermarket substitute.
What is WaterFurnace 12P505B03?
It is a genuine WaterFurnace OEM sensor, listed by WaterFurnace as “FP1RK01 Kit-Thermistor Freeze Sensor Yellow 84”.
Which WaterFurnace units use 12P505B03?
Confirmed fits include NDH026B101CSL, NDH026B101CSR, NDH038A101CER, NDH038B111NSL, NDH049A111NSR, and 28 more. The Fits These Units list on this page shows all 33 confirmed models.
Is 12P505B03 still available?
Discontinued — replaced by 12P560-05. WaterFurnace no longer supplies 12P505B03; order the direct factory replacement 12P560-05 instead.
What are the signs a sensor has failed?
Always disconnect power before inspecting. A failing sensor may give erratic or out-of-range readings, trigger sensor alarm codes, or read open or shorted on a meter check.
Is 12P505B03 a genuine WaterFurnace part?
Yes. 12P505B03 is WaterFurnace's own part number for this item, and this is a genuine OEM part, not an aftermarket substitute. Search or order by this number.
How do I confirm 12P505B03 fits my unit?
Match the part number on your original part, or check your unit's model against the Fits These Units list on this page. Not sure? Send us the model and serial number and we'll confirm before you order.
Fits These Units
Confirmed to fit the WaterFurnace units below — and these are not the only models this part fits. Contact us for the entire compatibility list, or if you don't see your unit, send the model and serial and we'll confirm before you buy.
- NDH026B101CSL
- NDH026B101CSR
- NDH038A101CER
- NDH038B111NSL
- NDH049A111NSR
- NDH072A101NEL
- NDV026B101CTR
- NDV038A101CTR
- NDV038A111CTL
- NDV038A111NTL
- NDV038B111NTR
- NDV049A101NTL
- NDV049A111CTL
- NDV049A111CTR
- NDV049A111NTL
- NDV049A141CTR
- NDV064A101CTL
- NDV064A111CTL
- NDV064A111CTR
- NDV064A111NTL
- NDV064A111NTR
- NDV064A141CTL
- NDV072A111CTR
- NDV072A111NRR
- NDV072A111NTR
- NDV072A141CTR
- NDZ064A11AC
- NSV036A111CTL
- NSZ036A11AC
- NSZ042A11AC
- SDV038B121CTLAP
- SDV049B122CTL
- SDV064B121CTR
Specifications
| Part Type | Sensor |
|---|---|
| Qty per Unit | 1 |
| Condition | New — Factory OEM |
| Availability | Discontinued |
Ask the Parts Desk
Not sure this fits? Need more than what's in stock? Send the model and serial from the unit's data plate — a real person reads it and confirms before you order.
Common Questions
Is the stock number on this page real?
Yes — it's the live count from our own shelf, not an availability estimate. If it says 1, that's how many are physically here. When it hits zero, this page says so.
Is this a genuine WaterFurnace part, or aftermarket?
Genuine WaterFurnace OEM equipment sourced through WaterFurnace's authorized parts program — not an aftermarket substitute.
How do I confirm this fits my unit?
Match part number 12P505B03 to your unit's parts diagram. If unsure, send us your model and serial number and we'll verify before you order.
What's the warranty on this part?
Warranty terms vary by manufacturer. Contact us with your order number for details specific to this part.
How fast does this ship?
In-stock items ship the same business day on orders placed before 1pm ET, Monday–Friday. Standard ground delivers to most of the continental US in 2–5 business days. Ships via UPS/FedEx Ground, or truck freight for oversized items. Free standard shipping on US orders of $50 or more.
Does everything ship UPS or FedEx Ground?
Most orders ship UPS or FedEx Ground. A small number of large or heavy parts across the catalog ship by truck freight instead, and we reach out to arrange a delivery window before those orders leave the warehouse. Oversized items that ship by truck freight are also covered by free standard shipping on orders of $50 or more.
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