Dometic Duo-Therm RV AC Freeze Control Sensor | 3309191.009

Restore freeze protection on your Dometic Duo-Therm RV air conditioner with the Dometic Duo-Therm 3309191.009 RV Air Conditioner Freeze Control Sensor. Genuine Dometic OEM freeze control sensor — monitors the evaporator coil temperature and sends signals to the control board to prevent coil freezing during operation.

What This Sensor Does

The freeze control sensor is a critical safety and performance component in your Dometic AC system. It:

• Monitors evaporator coil temperature in real time
• Sends signals to the control board when temperatures approach freezing
• Enables the control board to cycle the compressor to prevent ice formation on the coil

When the freeze sensor fails, symptoms typically include ice buildup on the evaporator coil, reduced cooling performance, water dripping into the coach interior, or compressor short-cycling.

Compatible Dometic Control Kits

Direct replacement for freeze sensors on:

• Dometic Analog Control Kit (Cool Only) — 3107541025.025
• Dometic Control Kit — 3310935.000

Replaces These Freeze Sensor Part Numbers

Direct cross-reference for these earlier freeze sensor part numbers:

• 3309191009
• 3106480.001
• 3309226003
• 3309190001
• 3309224008
• 3117 Freeze Sensors

If your existing failed freeze sensor carries any of these older part numbers, the 3309191.009 is the current OEM replacement.

Cross-Reference Part Numbers

• Part Number: 3309191.009

⚠️ Professional Installation Recommended

Installation involves 12V DC electrical wiring, proper sensor placement on the evaporator coil (position matters for accurate temperature reading), and integration with the AC control board. Installation should be performed by a qualified RV service technician unless you have prior experience with Dometic AC service.

2-Year Limited Manufacturer Warranty

Genuine Dometic OEM

Key Features

• Genuine Dometic OEM Duo-Therm freeze control sensor
• Part number: 3309191.009
• Prevents evaporator coil freezing during AC operation
• Compatible with: Dometic Analog Control Kit (Cool Only) 3107541025.025 and Control Kit 3310935.000
• Replaces: 3309191009, 3106480.001, 3309226003, 3309190001, 3309224008, 3117 Freeze Sensors
• Backed by 2-year limited manufacturer warranty

Specifications

• Brand: Dometic (Duo-Therm)
• Part Number: 3309191.009
• Type: RV Air Conditioner Freeze Control Sensor
• Function: Evaporator coil temperature monitoring / freeze protection signal to control board
• Compatible Control Kits: Dometic Analog Control Kit (Cool Only) 3107541025.025, Dometic Control Kit 3310935.000
• Replaces Part Numbers: 3309191009, 3106480.001, 3309226003, 3309190001, 3309224008, 3117 Freeze Sensors
• Warranty: 2-year limited manufacturer warranty