My Hydrohot system has functioned flawlessly this winter while in the furnace mode. Yesterday it functioned perfectly as it always has but this morning Zone 1 (living area) never turned on. Zone 2 (bedroom) functioned normally this morning. I checked the display panel next to the Hydrohot system in the outside bay and the light next to Zone 1 is not illuminated. Zone 2 is illuminated. I forgot all my manuals at home and am wondering if you guys have any suggestions as to what I can check? I tested the Zone 1 thermostat by running the other functions (fan, heat pump, AC) and it appears to be fine.