Congratulations on your new to you coach and
I am sure you will find this website and invaluable tool to help you with your new lifestyle.
Your system is probably an HWH brand which is of good quality. Find the pump and be sure that the "T" handles on the back side of the electrical solenoids on the pump manifold are all closed clockwise. If they are you either have air in the system that can be purged out or the valve is not seating well and pressure is escaping through them and will have to be replaced. Make sure the reservoir tank is full when the rooms are in and if you have hydraulic leveling jacks, that they are up. Let us know what you find and we can instruct you on how to purge the system for air and any contaminates that might be causing you a problem if need be.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7