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I reported your request to customer service. I might be able to answer your thermostat question but anything else is a matter for customer service
My screen shows your question is now locked by customer service. So perhaps it would be better to wait until they contact you an tell you how to proceed. Please provide the model number of the thermostat when you post next time. One other thing to try in the mean time. Connect the leads on R & W together and see if your furnace fires up. If it does then that rules out a problem with the furnace.
Then if your thermostat is non-programmable you should be able to just raise or lower the temp. Since I don't know what model you have I can't say how to do that. Usually it's with UP & DOWN arrows. If that doesn't work you probably need a new thermostat.
Ok, then my last answer still applies. Of course the SYSTEM button must be slid over to HEAT. If you've done all that and it still doesn't respond then you need a new thermostat assuming of course this isn't a long time problem which might be caused by inadequate output from undersized heating equipment
Your welcome. I'd appreciate a favorable rating