When your heating and cooling system suddenly stops working, it's not always the system itself that's gone wrong. Check your thermostat first. It could be the device itself that's malfunctioning, and fixing the thermostat is much less costly than replacing the HVAC system.
Testing the Thermostat
To test and see if the thermostat is broken, turn it from whatever setting you had it on to the opposite setting. So if you had it on heat, then turn it on to cool or change the degree from maybe 80 to 55. If nothing happens after about five minutes, then it's safe to assume that the thermostat is not tripping the HVAC system and needs to be repaired.
There are a few reasons as to why a thermostat stops working. Sometimes a thermostat trips a circuit breaker or blows a fuse, causing it not to work anymore. Faulty wiring can be another cause of thermostats breaking down. Other times the thermostat is not calibrated correctly. Also depending on the type of thermostat, it might not be located in the right area of the house, meaning it gets an insufficient reading of the indoor temperature. A professional will know exactly what kind of problem the thermostat has and proceed accordingly to fix the problem.
Replacing versus Repairing
Depending on the nature of the problem, it may be more economical to replace the thermostat rather than spend money on repairing it. For example, if the thermostat consistently breaks, despite resetting the circuit breaker or replacing the batteries, then it might be time to replace the thermostat with a new one because the old one is faulty. Consult your professional before buying a new one to make sure you get a thermostat that works well with your system.
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