Installed a 3M-30 programmable thermostat over the summer , the AC works fine , the fan works , but the heat does not work . The thermostat clicks as if the heat kicked in but it does not come on .

Ehow.com? This is amhd.com. Gas turned on? T'stat wired properly? Check the owners manual tor troubleshooting? Heater switch on? Fuse good? Do these checks and get back with us.