Under bunk heater mystery!

On mine the key has to be on . Turn it to the left.

 

Yes. And when it's running you'll hear the pump cycling every couple seconds. This bothered me at first but I began to like it, like a ticking clock that puts you to sleep..

If yours hasn't been running, it may have to prime the first time before it works right.

 

Mine has the control options but no heater. I feel cheated.

 

Ditto - mine to. The key has to be on 'accessory' and the toggle switch marked 'sleeper' with the fan symbol has to be on. I have a -'10 670

 

I drive a Volvo 780 and this is how I turn mine on: In the sleeper there is a control panel with a button that says "Menu" on it. Press it 3 times, then press the "On/Off" button just to the right of the Menu button to toggle the bunk heater on or off. Next press the "Set" but to the left of the Menu button to save the change. The panel will only give you 7 seconds between inputs.
I hope this helps.

 

Also, you can adjust the temp with the button below the Menu button.

 

Wondering why it can't use the same simple box installed in Fl. Kw. And Petes. Digital temp setting. One button for on and off.

That's a lot of pushing and rotating. LOL

 

That's what the owners manual says. I tried it and it works. . . .

 

Change the filters.