The Ultimate 2024 Guide to Fixing Common Thermostat Issues

Is Your Thermostat Not Working Properly?

Frustrated with an air conditioner that won’t turn on or keep your home comfortable? It could be your thermostat (sometime simply known as your air con controller). Our comprehensive guide will help you troubleshoot common thermostat issues. From dead batteries and incorrect settings to smart thermostat malfunctions, we’ve got solutions to restore your comfort.

Common Thermostat Setting Mistakes and Solutions

Is My Thermostat on Heat Instead of Cool? (Check the Mode)

The first thing to check when troubleshooting your air conditioner is the mode. It’s surprisingly common to set the temperature but forget to check if the system is in “Cool” or “Heat” mode.

Solution: Adjust the mode setting on your thermostat to match the current weather conditions and your comfort preferences. Look for icons like a snowflake (cool) or a sun (heat).

The Set Temperature Has Been Achieved!

This may sound like a no brainer but when the desired temperature is achieved your system will stop cooling however the fan may still be running to circulate air, during this OFF cycle of your AC system it may feel a little uncomfortable in the home.

In this case there are two ways to make it more comfortable:

1. Drop it like its hot: Drop the set temperature a degree or two so the system starts cooling again.
2. Turn on some ceiling fans: Increasing air movement can help make you feel more comfortable during the times the air con system is not cooling. Many customers ask if they should remove their ceiling fans when getting a ducted air conditioner installed, we aways recommend leaving them in for increased comfort!

Is the Temperature Set Correctly?

Sometimes, finding the perfect temperature setting on your thermostat can be tricky. While 22-24 degrees is a good starting point for energy efficiency, your ideal comfort level depends on various factors. If you’re relaxing, this temperature range may be perfect. However, if you’re active or experiencing high humidity, you may need to adjust the setting.

• Cooling: The desired temperature on the thermostat should be lower than the actual room temperature. We generally recommend 22-24 degrees, but you might find better comfort at a slightly lower setting.
• Heating: The desired temperature on the thermostat should be higher than the actual room temperature.

Solution: Experiment with small adjustments to your thermostat’s temperature setting to find your ideal comfort level. Remember, older thermostats might not show the actual room temperature. If this is an issue, consider upgrading to a smart thermostat such as MyAir or Airtouch for more precise control and monitoring.

Poor Thermostat Installation

You might not expect it, but how your thermostat is mounted on the wall can make a surprising difference. If it’s not installed flush or the hole for the wires isn’t sealed, hot air from inside the wall can leak out. This tricks your thermostat’s sensor into thinking the room is hotter than it is, causing your AC to work harder (and longer) than necessary. This drives up your energy bills!

Solution:

1. Carefully remove the thermostat from the wall.
2. Check the hole where the wires come through. Seal any gaps to prevent hot air leakage.
3. Reattach the thermostat, ensuring it sits tightly against the wall.

Optimize Thermostat Programming for Savings and Comfort

Smart thermostats offer fantastic scheduling features for maximizing comfort while saving energy. However, as your life changes, your programming needs might too! Outdated schedules can lead to:

• AC blasting and increasing your energy bills while the house is empty, wasting money.
• Unexpected temperature discomfort if your schedule shifts (working from home, etc.).

Solution: Regularly review your thermostat programming – think of it as a check-up! Here are some tips:

• Peak Solar Production: Consider pre cooling your home during peak solar production hours 10am-2pm to pre-cool your home while the energy is free, there is much point selling your excess energy back to the utility provide for $0.03-$0.08c.
• Geofencing: Check to see if your system allows for geofencing, ducted air conditioners with geofencing can turn off your system whenever no one is home!
• Adjust for Workdays: Tweak your schedule to match your typical workday hours.
• Weekend Updates: Don’t forget about your weekend routines. You might want different comfort settings.
• Take Action: Don’t just read this – go check your thermostat’s schedule right now!

Other Common Air Conditioning Thermostat Problems

Thermostat Electronics Failing

Is your thermostat acting erratically or not working properly? Failing electronic components could be causing your home’s temperature control problems. Let’s delve into the signs, causes, and what you can do about it.

Signs of Failing Thermostat Electronics

• Error Codes: Many modern thermostats display error codes when there’s an electronic problem. Consult your owner’s manual or contact an HVAC technician or manufacturer support to understand the code.
• Intermittent Display: A thermostat screen flickering, going blank, or showing partial information could indicate an electronic or power issue.
• Unresponsive Controls: Difficulty adjusting settings or a thermostat that doesn’t respond to temperature changes may point towards failing components.
• Settings Changing Automatically: If your AC turns on/off unexpectedly or the temperature setting changes by itself, the electronics within your thermostat could be at fault.

Important: If troubleshooting doesn’t fix the problem, it’s advisable to contact an HVAC professional. Thermostat electronics can be complex, and further diagnosis and repair may be needed.

Poor Thermostat Location

The placement of your thermostat is crucial for accurate readings. If it’s installed in the wrong location, your heating and cooling system may work inefficiently.

Signs of Incorrect Thermostat Location

• Uneven Temperature Distribution: You might notice that some rooms feel consistently too hot or too cold, no matter what you set on the thermostat.
• Frequent HVAC System Cycling: If your system turns on and off constantly, it could be struggling to maintain the desired temperature due to inaccurate readings from the thermostat.
• Really Low Temperature Settings: Do you find yourself setting the thermostat exceptionally low in cooling mode? This could mean the sensor is getting direct airflow from a vent, making it think the room is cooler than it actually is.

Potential Causes for Ducted Systems

With ducted systems like MyAir or Airtouch, they rely on small thermostat sensors placed in each zone. It’s crucial to ensure these sensors are not directly in the path of airflow from an air outlet. Otherwise, the system might shut off in that zone prematurely.

Solutions

• Evaluate the Sensor Location: Check where your thermostat (or zone sensors) are installed. Make sure they’re away from the following:
  • Heat sources (appliances, direct sunlight)
  • Drafts (windows, doors)
  • Direct airflow from ducted system vents
• Optimal Sensor Placement: For ducted systems, the ideal sensor location is within the return air path. In bedrooms, this is often near the light switch by the door.

Historical Note: Dirty Thermostats

Is your home’s temperature feeling a bit off? While dust and debris buildup are less likely to cause significant issues with modern digital thermostats, it was a common problem with older mechanical models. If you have a much older thermostat and notice inaccurate temperatures, gentle cleaning of the sensors with a soft brush might offer some improvement.

However, for most homeowners, inaccurate readings or temperature control issues often point to outdated technology. Upgrading to a newer thermostat can lead to better accuracy, increased energy efficiency, and the convenience of smart features.

When to Replace The Thermostat on Your Heating and Cooling System

Knowing when to replace your thermostat is crucial for maintaining a comfortable and energy-efficient home. Are you experiencing any of these issues? It might be time for an upgrade!

Signs It’s Time for Replacement

• Outdated Technology: If your old thermostat lacks smart features, programmable settings, or an easy-to-read display, an upgrade may enhance efficiency and comfort.
• Frequent Repairs: If you find yourself repeatedly troubleshooting thermostat problems, it may be more cost-effective to replace it.
• Inaccurate Readings, Unresponsive Controls: Difficulty setting the temperature or the thermostat not accurately reflecting the room temperature are signs of failing components.

Important Note: When replacing your thermostat, it’s a good opportunity to have a professional assess the overall condition of your HVAC system. If both are older, consider upgrading to a newer, more advanced air conditioner model that aligns with your comfort needs and energy-saving goals.

Time to Call a Professional

If you’ve given troubleshooting a fair go, but your aircon or heating system is still not performing properly, it’s time to bring in the experts. Our licensed tradies have the know-how to diagnose tricky problems and recommend the best solutions. Whether it’s a dodgy thermostat, wiring issues, or a more complex system problem, seeking professional help ensures your problem will be sorted out properly. Don’t let thermostat troubles ruin your comfort; call a qualified aircon technician to restore comfort and efficiency to your home.