Question about Pentair Mastertemp Heater

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Pentair mastertemp 200 is heating past the desired temp

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  • Pentair Master
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Bad temp sensor

Posted on Nov 16, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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  • 366 Answers

SOURCE: I have a Pentair MasterTemp Heater 250K BTU (i

try cycling the power to the heater itself. Check for damage (pack rats, etc..). It sounds like you may have had a direct short. It could be a board problem or a transformer problem. If you're still getting the service heater light, check to see if any diagnostic LED is illuminated behind the board.

Posted on Jan 19, 2010

  • 990 Answers

SOURCE: I have a Pentair Mastertemp 250 pool heater with

This is an ignition flame falure code. Could be you don't have gas getting to the pilot, no spark to ignite the pilot or your ignition is not reading the flame. Sorry to say but it's probally time to get the pool guy out to look at it. Good luck.

Posted on Apr 15, 2010

  • 990 Answers

SOURCE: heater cycles on / off

This could be a water flo problem. you need to chech to be sure your by-pass valve is closed down enough to force water threw heater, There is a internal by-pass that could be a problem also, or a bad pressure switch. If the by-pass isn't the problem then you should check these also.

Posted on Jul 26, 2010

  • 94 Answers

SOURCE: Pentair mastertemp 200 will work for a while and

If you are firing, and then going off and getting an E05, your igniter is to blame. It may be glowing but it's getting weak. The diagnostic goes further but that is usually the fix. with inactivity, the igniter is always to blame. You really need to fire it off weekly to make it reliable.

Posted on Feb 25, 2011

john224
  • 1378 Answers

SOURCE: Have a Pentair MasterTemp 400

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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1 Answer

I have a Pentair Master Temp 200. My pool tech fixed the E-05 error code a week ago. Now the amber heating led blinks for maybe 30 seconds but the heater doesn't come on and goes to the service heater...


Take off he front panel so you can see the back side of the circuit board.
Turn it on and once it fails see what red lights are lit on the back of the board, this will point you in the right direction as to what needs to be addressed.

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try calibration that might take care of problem otherwise sounds like new board

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since you already replaced the thermisto next would be the control board

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remote control see if controller heat is enabled or active if heater light on ok or check temp sensor

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have HVAC do it maybe need exhaust fan

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check gas pressure if ok check burner tubes over heating

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