420AMP furnace?

[hkench]

How do I get the heat on???

The wall mount thermostat has "furnace" lite up, but the roof AC is blowing out air. And not hot air.

The floor vents aren't doing anything, no air movement.

This can't be right. That would mean no heat on 12 volt, only when running geny or shore power.

[SeaDog]

Make sure the fan control in in auto then place controls to the heat mode with the temp selected at something above current ambient temp. you should hear the furnace start.

I don't understand you last sentence if the AC fan is running you are on generator or shore power. check the fuse for the furnace and do you have any other 12V like lights that are working.

[hkench]

Originally Posted by SeaDog

Make sure the fan control in in auto then place controls to the heat mode with the temp selected at something above current ambient temp. you should hear the furnace start.

I don't understand you last sentence if the AC fan is running you are on generator or shore power. check the fuse for the furnace and do you have any other 12V like lights that are working.

Hello Seadog, thank you for the quick reply.
By putting the thermostat fan switch to auto, the furnace now works properly. If I don't put it on auto, the roof mounted air conditioning fans turn on. I was afraid I might only have heat when running on 110 volts.

But if I set the fan to Auto, the furnace works just like every other camper I've had.

[SeaDog]

Thanks for getting back to the forum and letting us know it worked out.

[Bluepill]

On some systems the A/C fan will do exactly what you are describing. This is a option to de-stratify the air, somewhat like using a ceiling fan.

[Jon A]

Interesting SeaDog. Never would have thought about that.

[Mr. Dan]

You imply that you would have no heat from the furnace if the A/C blower is running. That's not true. As Bluepill suggests, the heater/furnace would still work even if the A/C blower is running. The A/C compressor is NOT running.

To all: as surprising as this condition appears to some, it is reported and solved 10-12 times per month here. One can search for furnace and find many threads on same.