Thank you for posting your question here on Fixya.com.

Page 43 of your manual, found here suggests both E05 and E06 errors mean the issue is related to "...(the) fuel supply, thermal regulator, check for correct orifices, etc...". It also touches on the possibility that if the unit was converted from NG to PP or vice-versa that the orifices are not correct.

Start with these two areas...if you need additional assistance please comment to this answer with details from what you find while checking these areas and I'll try and help you from there.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!