Why does my thermostat make a hissing noise?

Why does my thermostat make a hissing noise?

Pneumatic thermostats often hiss when they’re telling your AC or heating system to turn on or off. Pneumatic thermostats use small bimetallic strips that “read” the temperature. So, the frequent hissing noises coming from your thermostat are simply the metallic strips adjusting the air pressure inside those tubes.

Why does my thermostat smell like smoke?

Overheated Electrical Connections A problem with the wiring in your HVAC system, thermostat or somewhere in your home could also cause an odor of smoke. Turn the power off to the HVAC system. You may also need to check your circuit breaker and look for tripped circuits. Call us for emergency repairs.

Why will my AC not turn on?

If your AC unit won’t turn on, the first thing you should check is if there was a blown fuse or a tripped breaker. There’s a good chance that the problem is a tripped breaker if the circuit was overloaded. However, it is also possible that a power surge caused your air conditioner to blow a fuse or trip a breaker.

Why is my AC not below 73?

A clogged and dusty air filter will force your air conditioner to labor in circulating cool air to reach your desired temperature (e.g. your set your thermostat at 73 but the air won’t drop below 76). The evaporator coil, which cools the air, will then freeze, forming ice that obstructs the airflow.

Should a thermostat make a noise?

All thermostats make a clicking noise when activating the heating or cooling system. The noise does not mean that you have a problem, and it should not be very loud. Sensitivity to noise varies among individuals as well, and the sound might be more noticeable to you than to others.

Can a bad thermostat cause a burning smell?

Yes, if you set it on fire it will smell terrible!

How do I reset my thermostat?

Here are the step-by-step reset instructions:

1. Turn your thermostat off by switching it to the off position.
2. Find the breaker that powers your HVAC system and turn it off.
3. Wait 30 seconds and turn the breaker back on.
4. Turn your thermostat back on.