Do you have any problems with the heating fan draining your leisure
battery? We used the heating for about 4 hrs last week [1st time really used 'in anger' since we bought the M/Home in Apr 21 at nearly 5 yrs old] and suffered a 2 or 3 secs power failure. The power reset itself without intervention by us, but the Truma 6E threw a 170 Fault Code 'Low
Battery current'] which was ridiculous because the Lithium
Battery was brand new in mid Jul 21 and the Starter
Battery was upgraded and replaced on 24 Nov 21, and we had driven some 85 miles to the overnight pitch! The Starter
Battery was showing 12.88v and the Leisure
Battery around 13.3v from Multimeter readings, but we ran the engine just to be safe and also turned the heating off
The following morning, we had to use the heating to clear the humidity/ice from the M/home interior, and the heating started without a problem, except the fan was much noisier than it had been on the previous night [no fan settings altered] AND the M/Home interior warmed up much faster. It was as though the fan had shifted a lump of muck [M/Home had had very little use before we bought it, 8757 miles in 4 yrs 11 mths] or similar and had been able to reach proper operating speed, hence the noisier operation. The M/Home maintenance record was very patchy, and every time we have delved beneath seats, or moved the Dining Table, we have uncovered gritty lumps of muck and lubricant, so I wouldn't be surprised if the Truma had acquired its own 'bogey ball'. There was no burning or similar smell when the heating was operating, or when the power cut occurred.
I phoned Truma when we got home, and they say the 170 Fault Code refers to a Gas Spark/Lighter fault [not what the 6E Manual says], and both M/Home batteries have performed perfectly in the following 10 days, so the episode is a mystery!
Steve