Originally Posted by dmchapman
Here's our recent story. New Flagstaff Microlite 21ds, third outing. (2 batteries, dealer installed.) Second morning of a 2-night stay without hook ups. Battery monitor indicated "good" 2/3. While cooking bacon and pancakes one or both alarms, CO/propane and smoke, sounded. opened door and windows and ran range hood fan and bathroom fan. It took a long time to silence the alarms...maybe 15 minutes. When that was finally done I tried to run the furnace to take the chill off. The fan would cycle, the gas would initially ignite. You could feel warm air at the register but shortly the air would not be warm any more and the fan would run for a while and then stop. Not sure if CO/propane alarm sounded during that time. Didn't think to hook up the tow vehicle to see if it just needed a little more voltage to work right. Now at home with batteries fully charged and operating on shore power the furnace runs just fine.
The furnace module board constantly checks for a minimum 9.5 volts. If there is not 9.5 volts, the module board will go into a stand by mode until adequate power is supplied. It will then resume normal operation.
The furnace is a power hog and will drain the battery's fast the co/propane detector dose not like low voltage and will go into alarm when power drops to low.
Hope this helps Tim