Financing Available | 12 Months & No Interest

Mail us on

Comprehensive Guide to Honeywell Thermostats: Models, Error Codes, and Solutions

Book Your Appointment Now!

To book your next HVAC appointment with us, simply fill out the form below and we’ll contact you shortly. Alternatively, you can call the numbers listed on our website.

Honeywell thermostats are renowned for their reliability and precision in controlling indoor temperatures. In this comprehensive guide, we will delve into the world of Honeywell thermostats, exploring their various models, common error codes, and how Roma Heating can assist you with installation, troubleshooting, and maintenance. Whether you have a Honeywell thermostat at home or are considering installing one, this guide has you covered.

Honeywell Thermostat Models

Honeywell offers a wide range of thermostat models, each designed to meet specific heating and cooling needs. Here are some popular Honeywell thermostat series:

1. Honeywell T Series

The T Series includes non-programmable, programmable, and smart thermostats suitable for various HVAC systems. Models include the T2, T4, and T6 Pro.

2. Honeywell RTH Series

The RTH Series consists of programmable thermostats known for their ease of use and energy-saving features. Models include the RTH8500D and RTH9580WF.

3. Honeywell Lyric Series

The Lyric Series features smart thermostats that can be controlled remotely via a smartphone app. Models include the Lyric T5 and Lyric T6 Pro.

4. Honeywell Prestige Series

The Prestige Series offers high-end smart thermostats with advanced features like voice control. Models include the Prestige IAQ and Prestige HD.

5. Honeywell Wi-Fi VisionPRO Series

The Wi-Fi VisionPRO Series includes programmable thermostats with Wi-Fi connectivity. Models include the VisionPRO 8000 and VisionPRO 9000.

Common Honeywell Thermostat Error Codes

Honeywell thermostats are equipped with error code systems to help users identify and resolve issues. Here are some common Honeywell thermostat error codes and their meanings:

1. E1

Meaning: This error indicates a loss of communication between the thermostat and the indoor unit.

Solution: Check the wiring connections between the thermostat and the HVAC system. If the issue persists, contact Roma Heating for professional assistance.

2. E2

Meaning: E2 signifies a low battery or system voltage.

Solution: Replace the thermostat’s batteries. If the error continues, ensure the HVAC system is receiving power, or contact us for support.

3. E3

Meaning: E3 indicates a problem with the thermostat’s memory or settings.

Solution: Try resetting the thermostat to its default settings. If the error persists, contact Roma Heating for further assistance.

4. E4

Meaning: E4 denotes an outdoor temperature sensor error.

Solution: Ensure the outdoor temperature sensor is properly connected and functioning. If the problem persists, it may require professional attention.

5. E5

Meaning: E5 represents a compressor relay error.

Solution: Check the wiring and connections related to the compressor relay. If the issue persists, contact our experts for diagnosis and repair.

How Roma Heating Can Assist

At Roma Heating, we understand the importance of a well-functioning thermostat in maintaining indoor comfort. Here’s how we can help with your Honeywell thermostat:

Thermostat Installation: Our skilled technicians can install your Honeywell thermostat correctly, ensuring it integrates seamlessly with your HVAC system.

Error Code Diagnosis: If you encounter error codes on your thermostat, our experts can diagnose the issue and provide effective solutions.

Smart Thermostat Setup: Interested in upgrading to a smart thermostat? We can recommend the right Honeywell model and set up remote control and automation features.

Maintenance and Repairs: Whether your thermostat needs a simple battery replacement or complex repairs, we have the knowledge and experience to keep it running smoothly.

Model Number Lookup: If you’re unsure about your thermostat’s model or its compatibility with your HVAC system, we can assist you in identifying it.


Honeywell thermostats offer precise temperature control and energy-saving features for your home. Understanding the various models and error codes is essential for optimizing their performance. Whether you need thermostat installation, troubleshooting, or maintenance, Roma Heating is your trusted partner in Canada.

Contact Roma Heating today for all your Honeywell thermostat needs:

Phone: (604) 704-0300


Location: Roma Heating & Furnace Services, 2800 Douglas Rd B, Burnaby, BC V5C 5B7

Stay in control of your home’s comfort with Honeywell thermostats and Roma Heating’s expert services.

Book Your Appointment Now! 📅

To book your next HVAC appointment with us, simply fill out the form below and we’ll contact you shortly. Alternatively, you can call the numbers listed on our website.

How can we help you ?
By submitting this form, I agree to the terms and conditions.

Expert AC Repair in Surrey – ROMA HEATING

Expert AC Repair in Surrey - ROMA HEATING & COOLING HVAC Air Conditioning Introduction: As the summer heat intensifies in Surrey, having a properly functioning air conditioning system is crucial for maintaining a comfortable indoor environment. If you are...

Gas Furnace Repair in Richmond | ROMA Heating

Reliable Gas Furnace Repair in Richmond by ROMA Heating If you're searching for reliable gas furnace repair services in Richmond, look no further than ROMA Heating. As a trusted HVAC company in the area, we are dedicated to providing top-notch services...