Granatan RV Thermostat Replacement 12V 3-Wire — Black, Blue Backlit LCD & Fan Mode

Granatan 12V RV thermostat replacement is a compact, 3-wire heat/cool controller with fan mode and blue backlit LCD that fits many Dometic 3316250.712 setups.

This thermostat is designed for RVs, campers and trailers that need a straightforward 12V replacement for a standard 3-wire control. It offers a clear blue-backlit display, adjustable temperature range, fan mode and a simple three-wire hookup meant to match common Dometic installations. Built from durable ABS and sized for tight spaces, it’s a practical swap when your original control becomes unreliable or you simply want an easy-to-read display in low light.

Will this thermostat work with my RV’s wiring?

This unit is only compatible with 3-wire systems and is not suitable for 2-wire or 6-wire thermostats. Before purchase, compare the wiring colors and terminal layout on your existing control to ensure you have the correct three-conductor setup. If your current thermostat uses more or fewer wires, this replacement will not function properly.

• Designed exclusively for 3-wire RV thermostats
• Check terminal labels and wire count before installing
• Compatible with many Dometic 3316250.712 style controls

How easy is it to install this 12V thermostat in my camper?

Installation is intended to be quick for anyone familiar with basic RV wiring: disconnect power, match the three wires to the corresponding terminals, and secure the unit to the wall. The compact footprint and standard terminal layout make it suitable for typical RV mounting locations. Always confirm power is off before you touch wiring and consult a technician if you’re unsure.

• Simple three-wire hookup reduces installation time
• Mounting footprint: 3.15 × 3.15 × 1.1 inches for small spaces
• Lightweight 73 g set for easy wall mounting

What temperature and control features does it provide?

The thermostat supports a practical comfort range from 40–90°F and includes a fan mode so you can circulate air independently of heating or cooling. The blue backlit LCD improves visibility during night driving or low-light camping. Controls are responsive and designed for straightforward mode switching between heat, cool and fan-only operation.

• Temperature range: 40–90°F for versatile climate control
• Fan mode available for continuous circulation without heating/cooling
• Blue backlight LCD for easy nighttime readability

What are the build and durability highlights?

Constructed from durable ABS, the thermostat is built to tolerate the vibrations and temperature swings common in mobile environments. Its small size and low weight make it suitable for a variety of RV interiors without requiring major cabinet or wall modifications. The product is presented as a reliable replacement for aging or malfunctioning OEM controls in many standard 3-wire Dometic-type systems.

• ABS housing for everyday durability in motorhomes and trailers
• Compact dimensions fit tight interior spaces
• Designed for long-term use in camper and RV environments

Who is this for: This Granatan thermostat is aimed at RV owners, travel trailer and camper renovators, and technicians who need a dependable, easy-to-install 12V replacement for a 3-wire Dometic 3316250.712-style control. It’s best for users who require a clear backlit display, basic heat/cool/fan control and a compact, durable unit that fits standard mounting locations. If your RV uses a different wiring configuration, consult a qualified technician for the correct replacement model.