The pump and water heater need 12v. Are you boondocking? Have been using your furnace? Have you checked your battery state of charge? (The indicator lights may work even with a very low battery state of charge.)
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.