How to Detect a Bad Thermostat
A thermostat controls the HVAC system and keeps indoor temperatures at optimal levels, cool enough in summer and warm enough in winter.
A busted thermostat is bad news. It means unpleasant indoor temperatures that could even be dangerous. But spotting the warning signs early can prevent these issues before they become severe.
Here's a look at some of those warning signs:
Telltale signs of a malfunctioning thermostat
A thermostat controls the HVAC system and keeps indoor temperatures at optimal levels, cool enough in summer and warm enough in winter. If the thermostat isn't working correctly, then it can't work out the correct temperature and signal the HVAC system what to do in response. That means, at best, the system won't work correctly, or at worst, it could cause more considerable issues to the HVAC.
Look out for these signs:
A blank display screen means that the thermostat isn't getting enough power or isn't powering on at all.
Unresponsive controls (like being unable to change settings easily or unresponsive buttons) could mean the thermostat is broken or has firmware issues.
If the thermostat shows inaccurate temperatures, that's also a potentially serious problem.
If it's a smart thermostat and becomes inaccessible through other smart home devices, there could be an issue with the connection or the thermostat itself.
The thermostat may not function correctly even with new batteries, which indicates a deeper problem.
The cooling and heating may be inconsistent, often (but not always) due to thermostat issues.
The HVAC system might cycle on and off more often than normal due to a problem with the thermostat.
How to troubleshoot a thermostat
Before trying anything else, start by checking the batteries. Replace them to see if it solves issues with the thermostat. Many of the aforementioned thermostat problems could arise due to insufficient power.
It could also be a software bug, especially in modern, smart thermostats. Look for a reset button and turn it off and on again to see if power cycling solves the issue.
If that didn't help, look for visible damage or loose wiring. If anything seems fried, it's likely time to have the thermostat fixed or replaced.
If basic troubleshooting does not help and issues persist or recur, it could be time to call a professional. Experts in the field are best at dealing with complex wiring issues or substantial electrical work. They're also better equipped to install smart thermostats and complex systems or to replace a non-repairable older model.
Speak with the professionals
Some thermostat issues are possible to troubleshoot yourself, especially if they're simple, like battery issues or software bugs. However, an HVAC professional should look at your system once the issues become complex or involve electrical work.
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