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Hi Liliangel, thank you for your question. We need to get more details about this like if the thermostat shows 'Heat On' on the screen, if the system starts running, if you are getting air coming our of the vents and if it is warm air. The thermostat is a switch that tells the system when to start and stop running based on the inside and set temperatures. If the thermostat shows 'Heat On' steady on the screen and your system starts running that means that the thermostat is working properly and we recommend you contacting your HVAC contractor to check the system. We will be happy to help troubleshooting and discussing where the issue may be at (800) 633-3991 or through Private Message at our Honeywell Home Facebook account. - Maria
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