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Liam, I am Rudy Legett. I can sort our your Webasto burner.. My phone is 7 one 3. 8 one 8. 3234. I am available from 8 to 8 am central time.
You will want to have a VOM meter, set to volts DC and an alligator clip jumper cable to ground one lead. Have the cover off of the burner and we will see what is going on in about 10 or 15 minutes.
Talk to you then.