It appears you have been the victim of dealer fibology. If you have a 15k heat pump and you are in heat mode and the fan is in auto and the heat pump is running (infers shore or genset power) and your propane is on and your system is purged then when you press the furnace button the furnace light should illuminate and the furnace will become the default source for heat effectively disabling the heat pump reversing valve.
If it does not, it is malfunctioning.
No PMís (they are not private anyway)
Posting exclusively* in the Forester/Sunseeker section.