Question about Pentair Mastertemp Heater

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Have a Pentair MasterTemp 400 pool heater and I'm getting the error code E0S or possibly EO5 not sure.. What is this and what do I need to do..

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  • Anonymous Mar 19, 2014

    Wonte heat,,code error e01.

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If the heater fires and shuts down after a short time then replace the flu stack sensor.

Posted on Oct 01, 2014

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  • Pentair Master
  • 1,378 Answers

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


Error code E05 can be caused by many failures in several places. The owner's manual has a decent flow chart in it to help diagnose where the trouble lies. You will find it on page 43 here...

http://www.pentairpool.com/pdfs/MasterTempOM.pdf

Identifying problems with an electronically controlled pool heater is not a job for most homeowners without training and/or experience with this type of equipment. If you are unsure how to proceed no amount of tips from a site like this will replace experience. You may want to consider hiring a professional to look at your heater.

If you decide to pursue the repairs and need additional support please post as specific a question as you can as a comment to this reply.


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!

Posted on Mar 30, 2011

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Posted on Jan 02, 2017

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