Hi, I bought a hunter thermostat and Iam trying to get it installed .
I have connected all the wire's but the heater does not work . Bu the airconditioning runs.
What am I doing WRONG

Do you have the red wire connected to whatever you have of R, RH, and RC? If so, dig around in https://www.askmehelpdesk.com/heating-air-conditioning/heating-cooling-maintenance-repair-troubleshooting-frequently-asked-questions-58313.html