The Dometic 4450037173 AC Control Board Thermostat is the electronic brain of your Dometic 3300 and 3500 series rooftop air conditioners. This genuine OEM replacement control board manages temperature sensing, compressor cycling, fan speed control, and overall system operation. If your AC won't turn on, runs continuously without cycling, or displays erratic temperature control, this control board is likely the solution. Designed specifically for Dometic 3300 and 3500 series units, this thermostat control board restores factory performance and reliability.

Key Features

• Genuine Dometic OEM Part: Factory-engineered control board ensures perfect fit and reliable operation in 3300/3500 series air conditioners
• Complete Temperature Control: Manages thermostat functions, temperature sensing, and automatic cycling for optimal comfort
• Compressor & Fan Management: Controls compressor operation and fan speed settings for efficient cooling performance
• Direct Replacement: Plug-and-play installation replaces failed or malfunctioning original control boards
• Diagnostic LED Indicators: Built-in status lights help troubleshoot system operation and identify issues
• Durable Construction: Built to withstand RV vibration, temperature extremes, and continuous operation

Technical Specifications

Part Number	4450037173
Compatible Series	Dometic 3300 Series, 3500 Series
Component Type	Electronic Control Board / Thermostat
Function	Temperature Control, Compressor Management, Fan Speed Control
Installation Type	Direct Replacement, Plug-In Connectors

Compatible Models

Series	Models
3300 Series	Dometic Brisk Air 3300 Series Rooftop Air Conditioners
3500 Series	Dometic Brisk Air 3500 Series Rooftop Air Conditioners

Frequently Asked Questions

How do I know if my control board has failed?

Common symptoms of a failed control board include: AC unit won't turn on at all, compressor runs continuously without cycling off, fan operates but compressor doesn't engage, erratic temperature control or failure to reach set temperature, or no response from thermostat controls. If you've verified power supply and checked other components, the control board is often the culprit.

Is this control board difficult to replace?

Most RV owners with basic electrical knowledge can replace this control board. The process involves disconnecting power, removing the AC interior cover, unplugging wire harnesses from the old board, mounting the new board, and reconnecting the harnesses. Always disconnect shore power and turn off the breaker before working on AC electrical components. Consult your air conditioner's service manual for specific instructions.

Will this work with my older Dometic AC unit?

This control board is specifically engineered for Dometic 3300 and 3500 series air conditioners. To verify compatibility, check your AC unit's model number (usually found on the data plate inside the ceiling assembly or on the rooftop unit). If you have a different series (such as 2200, 5000, or Penguin series), you'll need a different control board specific to that model.

Does this include the wall thermostat or just the control board?

This is the main electronic control board that mounts inside the AC ceiling assembly, not the wall-mounted thermostat. The control board receives signals from your thermostat and controls the actual AC components. If your wall thermostat is also malfunctioning, that would be a separate part. This board handles the core system management and compressor/fan control functions.

Why Choose Elkhart RV Parts?

At Elkhart RV Parts, we specialize in hard-to-find Dometic replacement parts that keep your RV systems running smoothly. Located in Elkhart, Indiana — the RV Capital of the World — we understand the importance of getting the right part quickly. We stock genuine OEM Dometic components and ship fast so you can get back on the road. Our team knows Dometic systems inside and out and can help you identify exactly what you need. When you need a critical AC control board, trust the Dometic parts experts at Elkhart RV Parts.