Dometic ProHeat X30 Oxygen Sensor
The Dometic ProHeat 149800K Oxygen Sensor is the factory replacement O₂ sensor used in the exhaust side of the ProHeat X30 coolant heater.
The X30 uses closed-loop combustion control to continually monitor combustion conditions. The oxygen sensor provides feedback to the heater’s electronic control system, allowing it to adjust combustion parameters for efficient and dependable operation.
This adaptive system is one of the key technologies that distinguishes the ProHeat X30 from traditional fixed-control auxiliary heaters.
Key Features
- Genuine Dometic ProHeat replacement component
- Factory part number 149800K
- Designed for compatible ProHeat X30 coolant heaters
- Integrated into the X30 exhaust and heat-exchanger assembly
- Monitors oxygen levels in the exhaust stream
- Supports closed-loop combustion control
- Helps maintain the proper fuel-to-air ratio
- Supports automatic compensation for altitude and operating conditions
- Helps promote cleaner combustion and reduced deposit buildup
Closed-Loop Combustion Control
The ProHeat X30 uses its oxygen sensor to monitor exhaust conditions while the heater is operating.
Sensor feedback allows the X30 control system to continually adjust combustion parameters to maintain the proper fuel-to-air mixture.
This helps the heater adapt to changes in:
- Outside temperature
- Heater operating temperature
- Altitude
- Air density
- Environmental conditions
- Heating demand
The result is more consistent combustion across a wide range of operating conditions.
Helps Maintain Cleaner Combustion
Proper combustion is important for heater performance and long-term reliability.
By monitoring exhaust oxygen and allowing the X30 to adjust its combustion process, the 149800K O₂ sensor helps support:
- Cleaner combustion
- Consistent heater performance
- Reduced smoke
- Reduced combustion deposits
- Longer maintenance intervals
- Reliable operation across changing elevations
A failed or inaccurate oxygen sensor can interfere with the heater’s ability to properly regulate combustion and should be diagnosed according to ProHeat X30 service procedures.
Compatibility
- Manufacturer: Dometic ProHeat
- ProHeat Part Number: 149800K
- BTRAC Part Number: PH-149800K
- Product Type: Oxygen / O₂ Sensor
- Heater Family: ProHeat X30
- Assembly Location: Heat exchanger / exhaust assembly
- Application: Replacement combustion-control sensor
The official ProHeat X30 single-fuel-line parts catalog identifies 149800K as the oxygen sensor used in the heat exchanger assembly.
Serial Number Note
The current ProHeat X30 single-fuel-line parts catalog covers heaters with serial number:
X3H18017001 and above
For earlier dual-fuel-line X30 heaters, verify the existing sensor part number and heater serial number before ordering.
Related X30 Heat Exchanger Components
The oxygen sensor is located with several other components in the X30 heat-exchanger and exhaust assembly, including:
- 149077K – EGT Sensor
- 149080K – Straight Exhaust Flange
- 149024K – 3/4 in to -10 ORB Elbow Hose Fitting
- 149061K – X30 Cradle Mount
- 149021K – M6 × 1 × 16 Screw Package
- 149025K – M8 × 1.25 × 20 Screw Package
These surrounding components are listed separately and should not be assumed to be included with the 149800K Oxygen Sensor.
Installation Notes
Before replacing the oxygen sensor:
- Confirm the heater is a compatible ProHeat X30
- Verify the existing sensor part number
- Allow the heater and exhaust system to cool completely
- Disconnect electrical power before servicing the heater
- Inspect the sensor connector and wiring for damage
- Inspect the surrounding exhaust components for contamination or damage
- Follow the applicable ProHeat X30 service procedures
- Confirm proper heater operation after installation
Because the oxygen sensor is part of the heater’s combustion-control system, fault codes and other diagnostic information should be reviewed before replacing the sensor.
Product Specifications
- BTRAC SKU: PH-149800K
- Manufacturer: Dometic ProHeat
- Manufacturer Part Number: 149800K
- Product Type: Oxygen Sensor / O₂ Sensor
- Compatible Heater: ProHeat X30
- System Function: Exhaust oxygen monitoring
- Control System: Closed-loop combustion control
- Mounting Location: Heat exchanger / exhaust assembly
- Application: Replacement / service component
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