Rheem A2L Refrigerant Detection Sensor Sensirion, 47-109642-01
The Rheem 47-109642-01 is the genuine OEM A2L refrigerant detection sensor for Rheem RH2TY-series two-stage R-454B air handlers, built with Sensirion sensing technology. It replaces the original factory sensor, part 47-109708-01, and fits RH2TY air handlers from 2 to 5 tons in 17", 21", and 24" cabinets. The sensor monitors the indoor section for leaked A2L refrigerant, a required safety function on R-454B equipment. HVAC technicians and contractors can use it to restore the leak detection system with an exact Rheem replacement.
Is the 47-109642-01 the Right Sensor for Your Air Handler?
This sensor is listed for Rheem RH2TY air handlers built for R-454B refrigerant, including the standard, MTAN, and RHC variants shown in the compatibility table below. Match the full model number on your air handler's rating plate to the list before ordering. Suffix letters matter, and some RH2TY variants use a different sensor.
If your system shows an A2L sensor fault, have a qualified technician confirm whether there is an actual refrigerant leak and inspect the sensor harness and connections before replacing the sensor. If your air handler originally shipped with sensor 47-109708-01, the 47-109642-01 is the listed replacement.
Ideal for: Service technicians and contractors repairing Rheem RH2TY two-stage R-454B air handlers, such as the 2 Ton Rheem RH2TY2417STANNJ, 3 Ton Rheem RH2TY3621STANNJ, and 5 Ton Rheem RH2TY6024STANNJ.
Working on Goodman R-32 equipment? See the Goodman R-32 A2L Refrigerant Detection Sensor, SER2A08012S, or browse more electrical components, kits, and protection parts.
Always verify compatibility by matching the full model number on your equipment's rating plate before ordering. Installation should be performed by a qualified HVAC technician. Request help confirming fit, contact Budget Heating, or call 813-885-7999.
What's Included
| Part | A2L Refrigerant Detection Sensor |
|---|---|
| Brand | Rheem (Genuine OEM Part) |
| Part Number | 47-109642-01 |
| Replaces | 47-109708-01 |
| Sensor Technology | Sensirion |
| Refrigerant | R-454B (A2L) |
| Fits | Rheem RH2TY Two-Stage R-454B Air Handlers, 2–5 Tons |
| Installation | Professional Installation Recommended |
The tables below list the Rheem RH2TY air handler models that use part 47-109642-01. Models are grouped by size and cabinet width. Use the full model number from your unit's rating plate to confirm the match. Find more genuine Rheem HVAC equipment and parts at Budget Heating.
| 2 Ton, 17" Cabinet (RH2TY2417) | RH2TY2417STANNA, RH2TY2417STANNARHC, RH2TY2417STANNJ, RH2TY2417STANNJRHC |
|---|---|
| 3 Ton, 17" Cabinet (RH2TY3617) | RH2TY3617STANNA, RH2TY3617STANNARHC, RH2TY3617STANND, RH2TY3617STANNDRHC, RH2TY3617STANNJ, RH2TY3617STANNJRHC |
| 3 Ton, 21" Cabinet (RH2TY3621) | RH2TY3621MTANAA, RH2TY3621MTANAARHC, RH2TY3621MTANAD, RH2TY3621MTANADRHC, RH2TY3621MTANAJ, RH2TY3621MTANAJRHC, RH2TY3621MTANNA, RH2TY3621MTANNARHC, RH2TY3621MTANND, RH2TY3621MTANNDRHC, RH2TY3621MTANNJ, RH2TY3621MTANNJRHC, RH2TY3621STANNA, RH2TY3621STANNARHC, RH2TY3621STANND, RH2TY3621STANNDRHC, RH2TY3621STANNJ, RH2TY3621STANNJRHC |
| 4 Ton, 21" Cabinet (RH2TY4821) | RH2TY4821STANAA, RH2TY4821STANAARHC, RH2TY4821STANAD, RH2TY4821STANADRHC, RH2TY4821STANAJ, RH2TY4821STANAJRHC, RH2TY4821STANNA, RH2TY4821STANNARHC, RH2TY4821STANND, RH2TY4821STANNDRHC, RH2TY4821STANNJ, RH2TY4821STANNJRHC |
| 4 Ton, 24" Cabinet (RH2TY4824) | RH2TY4824MTANNA, RH2TY4824MTANNARHC, RH2TY4824MTANND, RH2TY4824MTANNDRHC, RH2TY4824MTANNJ, RH2TY4824MTANNJRHC, RH2TY4824STANNA, RH2TY4824STANNARHC, RH2TY4824STANND, RH2TY4824STANNDRHC, RH2TY4824STANNJ, RH2TY4824STANNJRHC |
| 5 Ton, 21" Cabinet (RH2TY6021) | RH2TY6021STANAA, RH2TY6021STANAARHC, RH2TY6021STANAD, RH2TY6021STANADRHC, RH2TY6021STANAJ, RH2TY6021STANAJRHC |
| 5 Ton, 24" Cabinet (RH2TY6024) | RH2TY6024STANNA, RH2TY6024STANNARHC, RH2TY6024STANND, RH2TY6024STANNDRHC, RH2TY6024STANNJ, RH2TY6024STANNJRHC |
Sensor Features & Service Notes
47-109642-01 A2L Sensor
- Genuine Rheem OEM replacement part
- Sensirion refrigerant sensing technology
- Detects leaked A2L refrigerant in R-454B equipment
- Listed for Rheem RH2TY two-stage air handlers, 2–5 tons
- Covers 17", 21", and 24" RH2TY cabinet sizes
- Replaces original sensor part 47-109708-01
- Restores the factory leak detection safety function
- New, not refurbished
Before You Replace
- Match your full air handler model number to the compatibility table
- Check suffix letters, since some RH2TY variants use a different sensor
- Have a technician check for an actual refrigerant leak first
- Inspect the sensor harness and connectors for damage
- Disconnect all power before servicing
- Install in the factory sensor location and orientation
- Confirm normal operation and clear fault codes after installation
- Follow the air handler's installation and service instructions
Frequently Asked Questions
Which Rheem air handlers use the 47-109642-01 sensor?
It is listed for Rheem RH2TY two-stage R-454B air handlers, including the RH2TY2417, RH2TY3617, RH2TY3621, RH2TY4821, RH2TY4824, RH2TY6021, and RH2TY6024 families. See the compatibility table above for every listed model number.
Does 47-109642-01 replace sensor 47-109708-01?
Yes. Rheem distributor parts data lists 47-109642-01 as the replacement for the original A2L sensor, part 47-109708-01, on the RH2TY air handlers shown above.
What does the A2L sensor do in an R-454B air handler?
It monitors the indoor section for leaked R-454B refrigerant. If it detects refrigerant, the equipment's control responds with its programmed safety actions, as required for A2L refrigerant systems.
Can my RH2TY air handler run without the A2L sensor?
The leak detection sensor is a required safety component. A missing or failed sensor can trigger fault codes or keep the system from operating normally, so it should be replaced, never bypassed.
Does a sensor fault always mean refrigerant is leaking?
No. A fault can come from a real leak, a damaged wire or connector, or a failed sensor. A qualified technician should check for leaks and test the sensor circuit before replacing the part.
My model number ends in "L" or "RHL". Will this sensor fit?
RH2TY models with "L" or "RHL" suffixes are listed with a different A2L sensor, so verify your exact part number with our team or your unit's parts list before ordering.
