From: wolverine01@charter.net   
      
   On 11/19/2024 9:19 AM, Ted Heise wrote:   
   > Hi all,   
   >   
   > I may have alluded to this before, but last time we camped on a   
   > flatspot in our Lance 1475 the night temps dropped into the 40s or   
   > 50s and I had trouble running the furnace on 12 V.  It's a Truma   
   > Combi Eco Plus; the gas would fire up and the fan would run for a   
   > minute or two, then stop--without having brought the inside temp   
   > up to the thermostat setting.   
   >   
   > You may recall that this unit was replaced under warranty earlier   
   > this year (due to E6H error codes suggesting combustion air motor   
   > problems).  But this more recent behavior doesn't seem connected.   
   >   
   > As near as I can tell, the unit should run on propane with 12 V   
   > power for the fan.  The battery was at full 100 Ah capacity, so it   
   > wasn't a low charge state.  I'm wondering if being LI is a factor,   
   > for example is it possible there is internal resistance in the   
   > battery that limits the current?  Seems crazy, but I'm not sure   
   > what else to think.  FWIW, it's a Li Time battery (from China),   
   > and has worked as expected or even better.   
   >   
   > I plan to call my dealer, but thought I'd check in with the   
   > experienced folks here first.   
   >   
      
   If the furnace actually operates as it should when it is running, I   
   would first think about the thermostat.  For example, I would try and   
   raise it higher to see if it runs longer and then shuts off still   
   without reaching desired temperature.  If it still does this, I would be   
   interested in finding out where the probe for temperature sensing is   
   located.  It might just be too far away from the thermostat, and too   
   close to the hot air vents.  This unit has a setting for temperature   
   offset for RV's where this is an issue.  If the furnace shuts off 5   
   degrees before desired temp, you adjust the offset by this amount.   
      
      
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