Kool-o-matic access

[Dbyrd86]

the koolmatic only will work when the thermostat is set to heat and auto so if i have 110 power then the electric heat and fan both work. i had a local rv shop do interior work including wallpaper and i expect they wired the thermostat incorrectly. i've tried different wiring options on the thermostat but cannt get the koolmatic to work on the cool setting only the hot.

thanks for reply