I should have read the manual

after having a problem with the electrics on my coachman vip, ie battery sulphating, and alde heating panel blanking,  i had the battery replaced and sent the boiler pcb and control to apuljacks for test/repair turns out they were both working and it was the control cable that runs through the cabinet work to the boiler, anyway new cable sorted, switched on, the panel works but got  warning showing red failure, but its booked into caravan dealers for a check on alde system,  but on reading the coachman manual it does say  if storing the caravan over winter then remove control panel to a warm dry place. how many people do that.? anyway once the boiler sorted we are going to sell the van  due to wifes ill health  theres no way we would be able to use it she had a double fractured back so after 40+ years its time to call it a day.