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Maybe the window above or to the right of the heater cowl is open. 

If so, shut it. 

 

Got from Googling 

Truma code W420H

Graham

 

Unless otherwise stated all posts are my personal opinion 

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As WispMan said, Google it.  I Googled "Truma W420H" and it led me straight to an FAQ.

 

"Warning W 412 H or W 42 H appears in the display of the CP plus panel – what should I do?

"Your heater includes a window switch which prevents the heater from starting up if the side window above or right next to wall cowl of your heater is not completely closed.

"Please check that the window in question is locked when completely closed."

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Yesterday I was going to say that it looked to me as though the caravan was on its side but decided not to.

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41 minutes ago, Orange said:

Yesterday I was going to say that it looked to me as though the caravan was on its side but decided not to.

That might be the only way to keep the window closed!  :ph34r:

Trevor.

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