Having issues with your Honeywell thermostat not allowing the temperature to go above 70 degrees? You’re not alone – this is a common problem that many homeowners face. The good news is that in most cases, it’s an easy fix. In this blog post, we’ll discuss the main reasons why your Honeywell thermostat is capped at 70 degrees and show you step-by-step how to troubleshoot and resolve the issue.
Common Causes of Honeywell Thermostat Capping at 70 Degrees
There are a few key reasons why your Honeywell thermostat may refuse to go above 70 degrees:
1. Temperature Limit Setting
Many Honeywell thermostats have a temperature limit feature that prevents the thermostat from going above a certain temperature. This is usually adjustable in the user settings. If the max temperature is set to 70 degrees, then the thermostat will not allow you to raise the temperature above this point.
2. Faulty Thermostat
If your Honeywell thermostat is malfunctioning, it may erroneously cap the temperature at 70 degrees. This could be due to bad internal components or connection issues. A faulty thermostat requires replacement to resolve the problem.
3. Improper Wiring
Incorrect wiring between the thermostat and the HVAC system can cause unusual temperature control issues. If the wires are connected improperly, you may experience problems like a 70 degree temperature cap.
4. System Compatibility Problems
Sometimes the thermostat model may not be fully compatible with your HVAC system. Compatibility problems can lead to temperature control errors like not being able to exceed 70 degrees.
Step-by-Step Troubleshooting Guide
If your Honeywell thermostat is capped at 70 degrees, don’t panic. Here is a systematic troubleshooting guide to help pinpoint the cause:
Step 1: Check the Temperature Limit Setting
The first thing to check is whether a temperature limit of 70 degrees has been configured in the thermostat settings. Refer to your thermostat manual on how to view and adjust the max temperature limit. Raising this limit should allow you to increase the thermostat reading above 70 degrees.
Step 2: Reset the Thermostat
If adjusting the temperature limit does not work, try resetting the thermostat to factory defaults. This will erase any erroneous settings that may be causing the issue. Reprogramming the thermostat after resetting often resolves uncommon temperature control problems.
Step 3: Check for Faulty Thermostat
Reset the thermostat and retry normal operation. If the temperature is still capped at 70 degrees, you likely have a faulty thermostat. Confirm this by checking if the thermostat display and buttons are working properly. Erratic readings and unresponsive buttons indicate a bad thermostat that requires replacement.
Step 4: Verify Proper Wiring
Before replacing the thermostat itself, check the wiring first. Make sure all connections at the thermostat and the HVAC control board are accurate based on the thermostat wiring diagram. Improper wiring is commonly overlooked and could be the reason for the temperature limitation.
Step 5: Check HVAC System Compatibility
If the wiring checks out okay, the last thing to check is system compatibility. Confirm that your thermostat model is designed to work with your HVAC system. In rare cases, incompatibility issues may be causing the temperature problems.
Professional HVAC Technician Assistance
If you are still unable to identify the cause through troubleshooting, your best bet is to call in a professional HVAC technician. A certified technician can methodically diagnose the specific reason why your Honeywell thermostat is stuck at 70 degrees. They can check for wiring issues, install a compatible thermostat, or replace the thermostat if defective. While professional help has a cost, it often saves money and frustration compared to endless trial-and-error troubleshooting.
Settings to Adjust on the Honeywell Thermostat
After you have identified and fixed the underlying cause of the temperature limitation, there are a few key settings on the Honeywell thermostat to adjust:
Adjust the Heat Temperature Limit Setting
If your thermostat has a maximum heat temperature setting, make sure this is raised above 70 degrees to allow higher heating levels. Refer to your thermostat manual for details.
Change the System Switch Setting
Ensure the system switch is properly set to “Heat” when you want to raise temperatures. The auto/off mode may prevent heating past 70 degrees.
Increase the Heat Anticipator Setting
Turning up the heat anticipator setting may help overcome the 70 degree limit by running the furnace slightly longer during cycles. Incrementally increase the anticipator value until the desired temperature is reached.
Enable Automatic Heat/Cool Changeover
Enabling auto changeover will allow the thermostat to automatically switch to heat mode when the temperature drops below the setpoint. This prevents getting stuck in cool mode when you need heat.
Maintaining Proper Thermostat Operation
Once you have your Honeywell thermostat working above 70 degrees, be sure to follow these tips to maintain proper operation:
- Check the thermostat manual to stay within the temperature and humidity operating limits
- Monitor the thermostat accuracy and recalibrate if required
- Set a reminder to replace the thermostat batteries annually
- Keep the thermostat clean by gently wiping with a microfiber cloth
- Avoid direct sunlight which can interfere with the thermostat sensors
- Verify the thermostat vents are clear to allow airflow and prevent overheating
Taking a few minutes for routine maintenance will ensure your Honeywell thermostat continues working properly for years to come.
Honeywell Thermostat Won’t Go Above 70: Final Thoughts
Troubleshooting a Honeywell thermostat stuck at 70 degrees can definitely be frustrating. However, in most cases the culprit ends up being something simple like an incorrect setting or wiring issue. Following the step-by-step guide above should help you identify and resolve the problem. Reach out to a professional HVAC technician if needed for further diagnosis and repair assistance. With the right fix, your Honeywell thermostat will be able to provide reliable temperature control above 70 degrees.
Alternative Thermostat Options If Honeywell Isn’t Working
If you’ve determined your Honeywell thermostat is faulty and requires replacement, you may want to consider alternative thermostat options besides just replacing with another Honeywell model. Here are a few top-rated programmable thermostats to consider:
The Ecobee SmartThermostat is a Wifi-enabled model with voice control capabilities. It can be controlled using Amazon Alexa, Google Assistant, or Apple HomeKit. The Ecobee learns your schedule and programming preferences over time. It also has remote temperature sensors to better control multiple zones.
Nest Learning Thermostat
This popular thermostat by Google/Alphabet has auto-scheduling built in to optimize heating and cooling. The Nest thermostat can be controlled remotely via smartphone and sends alerts for issues. The sleek round design makes it an eye-catching accent on the wall.
Emerson Sensi Touch WiFi Thermostat
For a more budget-friendly option, the Emerson Sensi thermostat connects via WiFi without the cost of most smart models. It can be adjusted remotely using the Sensi app. The clear LCD touchscreen display is intuitive and easy to use.
Lux TX9600TS Programmable Thermostat
The Lux TX9600TS is a 7-day programmable thermostat available at most hardware stores. It has a basic digital display with touch buttons for changing settings. While lacking WiFi, the Lux is reliable, straightforward, and very affordable.
Braeburn 5200W Thermostat
This moderately priced thermostat by Braeburn provides options like 5-2 day programming and adaptive recovery to gradually reach set temperatures. The backlit screen makes viewing settings easy. Appealing basic features at a compelling price point.
Replacing a Honeywell Thermostat Step-by-Step
If you do opt to replace your faulty Honeywell thermostat, switching to a new thermostat is a relatively straightforward DIY project for most homeowners. Here are the steps:
- Turn off power to HVAC system at the circuit breaker
- Remove old thermostat base plate from the wall
- Take a photo of the wiring connections for reference
- Disconnect wires from old Honeywell thermostat terminals
- Remove old thermostat completely and clean wall area
- Mount new thermostat base plate using provided hardware
- Connect wires to matching terminal letters/colors on new thermostat
- Insert batteries in battery-powered models like Nest or Ecobee
- Carefully align thermostat body and snap onto base plate
- Turn circuit breaker back on to power the HVAC system
- Follow thermostat instructions to complete setup and programming
- Test thermostat operation and adjust settings as needed
If at any point the wiring connections or compatibility with your HVAC system are unclear, contact a technician to avoid improper installation. Done correctly, upgrading to a new modern thermostat can be done by most homeowners in about 30-60 minutes.
Troubleshooting Thermostat Issues To Prevent Future Problems
Beyond just replacing a malfunctioning Honeywell thermostat, it is a wise idea to troubleshoot the root cause of the issues to prevent recurrence in the future. Here are some troubleshooting tips:
- Inspect the HVAC equipment itself for any issues that may be causing problems for the thermostat
- Make sure HVAC air filters are clean and replaced regularly to support proper airflow
- Check for electrical shorts in thermostat wiring that may be interfering with operation
- Confirm HVAC system size is properly matched to the home for adequate temperature control
- Inspect ductwork and sealing for leaks that reduce efficiency and temperature consistency
- Test thermostat wiring for proper voltage levels so power fluctuations don’t cause problems
- Verify HVAC technician performed thorough maintenance checks on HVAC components
Addressing underlying HVAC problems ahead of time will allow for smoother thermostat operation and fewer temperature issues in the future. An ounce of prevention is truly worth a pound of cure when it comes to home heating and cooling systems.
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