Today was the day to get the motorhome de-winterized and ready for summer. I actually did part of it a couple of days ago by running the generator under load for an hour and a half. This has to be done once a month to ensure it works when you need it. It fired right up and ran the rooftop air conditioner.
Today I de-winterized the fresh water system. When I put it to bed for the winter last year I drained the tank, water heater and all the lines. Today I closed all the drain valves and filled the fresh water tank with fresh water with a cup or so of bleach added. I then turned on the pump and opened each of the hot and cold taps in turn until bleach smelling water came through. Then I turned on the water heater, gave it a few minutes and made sure hot water came out all the taps. It did. Everything works!
I then tried the furnace. I knew it would not work and it did not. It quit two or three years ago and I didn't do anything about it. These propane furnaces that come with RV's are wonders of inefficiency. They are loud, use way too much propane and worse, use way too much battery power to run the fan. I hardly ever use the furnace, it just is not worth all the noise, expense and bother. When I am parked and have electricity I use the electric heater and if I am boondocking I simply start up the truck and run the truck heater for a few minutes once in a while. I am a fair weather RVer anyway so it is hardly ever an issue.
I have had this furnace repaired a couple of times in the past, the last time it needed a new circuit board and a new high limit switch. Total cost? $650 (Canadian). Yes, ouch! And it maybe only got used between 10 and 20 hours since it was repaired last. I am not going down that rabbit hole again. I am going to buy a "Mr. Heater" freestanding propane heater and run it off either a 20 pound propane bottle or connect it to the RV propane system. These heaters are only $150 and run virtually silent, using no power at all. Many RVers have them. They are 100% efficient and produce little to no CO2 for which I have a sensor / alarm. They are switchable between 4000 and 9000 BTU and are perfectly safe. I may never use it but I will have it if I need it. The next owner can deal with the furnace it they want to beat themselves up.