If checking these basic factors does not resolve the issue, it is recommended to contact a professional HVAC technician. https://mytischi-city.ru/imgnews/aHR0cHM6Ly9zYWRhLS1jb2xvci1tYWtpMy1uZXQudHJhbnNsYXRlLmdvb2cvYmJzL2Jicy5jZ2k/cGFnZT0wJl94X3RyX3NjaD1odHRwJl94X3RyX3NsPWF1dG8mX3hfdHJfdGw9ZnImX3hfdHJfaGw9ZnI=