High pitched tone, coming from furnace area
Greetings - first thanks to all, have been lurking here for a couple weeks trying to learn as much as I can before we pulled the trigger on our new-to-us 2019 Thor Vegas 27.7.
To make a long story short-ish.
The high pitched sound is coming from the furnace area.
This starts when I simply turn the igition key on, or to "ACC".
The furnace is not running. No fans going.
I have pulled each of the fuses out, one at a time, no effect.
I have turned House power off (the one in the entrance step well), no effect.
I switched the breaker off at the fuse panel, no effect.
Turning the furnace on, it functions normally, no effect on sound.
Turning the ignition off, and sound stops.
No gas smell, no alarms displaying anywhere.
Found some schematics on the Thor website, but the furnace unit doesnt really show whats inside, for any solenoid/sensor/whatever.
Im at a total loss now, really really don't want to try to remove the entire
ANY ideas would be much appreciated.