The Atwood 93105 Adjustable Electronic Thermostat is a compact control device used in RV heating systems to manage furnace operation with precision. This article explains its key features, compatibility, installation steps, troubleshooting tips, and maintenance guidance to help owners maximize efficiency and reliability.

Overview Of The Atwood 93105 Adjustable Electronic Thermostat

The 93105 is designed as a dependable control solution for Atwood RV furnaces, offering adjustable settings to regulate furnace cycles and temperatures. It integrates with standard 12V electrical systems common in motorhomes, providing consistent performance in varying climates. The device typically features a user-friendly dial or digital interface for temperature selection and a reliable relay output to trigger the furnace. Understanding its specifications ensures proper matching with compatible furnace models and avoids unnecessary rewiring or compatibility issues.

Key Features And Specifications

Important features include:

Adjustable Temperature Range: Allows precise control of furnace cycling to maintain the desired interior temperature.
12V DC Operation: Designed for typical RV electrical systems with minimal power draw.
Relay Output: Directs power to the furnace blower and burner when heating is needed.
Compact Form Factor: Fits standard HVAC panels in most RV interiors.
Compatibility: Primarily designed for Atwood furnaces but may be compatible with similar models depending on wiring and voltage requirements.

Note: Always verify part numbers, wiring diagrams, and the specific furnace model to ensure compatibility before replacement or installation.

Compatibility And Replacement Considerations

Compatibility hinges on the furnace model, voltage, and connector type. The 93105 is commonly used with certain older Atwood units, but newer or different series may require a different thermostat or a compatible adapter harness. Before purchasing a replacement, check:

Exact furnace model and year
Voltage requirements (typically 12V DC for RV systems)
Wiring connector type and pinout
Availability of replacement part with the same mounting footprint

If the 93105 is not compatible, consult the Atwood service literature or a certified RV technician for a suitable substitute, which may include modern programmable thermostats designed for marine or RV use.

Installation And Wiring Tips

To install or replace the 93105, follow these practical steps. Always disconnect the power before starting any work.

Remove the existing thermostat carefully, noting connector colors and pin positions.
Match wires to the new thermostat according to the wiring diagram. Common color codes include red (power), white (heat call), and ground.
Secure the thermostat in the original mounting location to ensure proper venting and accessibility.
Test the system in a safe, controlled environment before relying on it during travel.
Confirm that the furnace ignites correctly and cycles as the thermostat setting changes.

If wiring is uncertain, or the unit uses nonstandard connectors, consider using a compatible adapter harness or consulting a professional technician to avoid miswiring that could damage the furnace or create safety risks.

Common Issues And Troubleshooting

Typical symptoms and their remedies include:

No heat or furnace not firing: Check power supply, fuse, and thermostat wiring. Ensure the thermostat is set to a temperature higher than the room setpoint.
Furnace cycling too quickly: Verify the temperature differential and ensure the thermostat is not in a location exposed to direct sunlight or drafts.
Inaccurate temperature readings: Calibrate if the model supports it, or replace the thermostat if the sensor is faulty.
Loose connections or corroded contacts: Inspect and reseat connectors, cleaning terminals as needed with appropriate electronics cleaner.

Routine checks on wiring, battery voltage, and the presence of corrosion can prevent many failures. If issues persist after basic troubleshooting, replacement with a new or compatible unit is advised.

Maintenance And Longevity

Regular maintenance extends the life of the Atwood 93105. Key maintenance tasks include:

Periodic inspection of wiring, connectors, and mounting hardware for looseness or corrosion.
Ensuring clean, unobstructed access to the thermostat for accurate temperature sensing and reliable operation.
Using manufacturer-approved replacement parts to preserve intended electrical characteristics.
Protecting the thermostat from moisture and excessive dust, particularly in areas with frequent road vibrations.

Proactive care reduces the risk of unexpected furnace failures during trips and helps maintain consistent comfort in varying climates.

Where To Buy And How To Verify Authenticity

Authentic Atwood 93105 thermostats can be found through official Atwood dealers, RV supply houses, and reputable online retailers. When purchasing, verify:

Part number and model compatibility with your furnace
Return policy and warranty coverage
Vendor reputation and product reviews

Be cautious of counterfeit or incompatible units. Request product datasheets or installation guides from the seller to confirm specifications before checkout.

Safety Considerations

Working with RV heating systems involves electrical and combustion components. Adhere to these safety practices:

Disconnect the RV battery or shore power before removing or installing components.
Follow the furnace manufacturer’s instructions and local codes for electrical work.
If uncertain about wiring or safety, hire a licensed RV technician or electrician.

Proper installation and maintenance minimize fire risk and ensure reliable heating performance when needed.

Glossary Of Terms

<strongThermostat: A device that senses temperature and controls heating or cooling machinery.
<strongRelay Output: An electrical switch inside the thermostat that activates the furnace.
<strongVoltage: The electrical potential supplied to the thermostat and furnace (usually 12V DC in RV systems).
<strongDifferential: The temperature range by which the thermostat triggers on and off to maintain comfort.