This is not a question but more of an observation i just wanted to share with people. I have no problems with my heaters so never get the symbol appearing, but if i plug my booster pack into my cig lighter for charging on the move before i turn the ignition on the symbol appears. If i unplug the booster pack the symbol stays on until i turn the ignition off, then turn it back on and its gone. This doesnt happen if i first turn the ignition on then plug the booster pack in.