Question about Pentair PUREX MINIMAX HEATER; THERMOSTAT, 60 CAPILLARY - 072022

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My heater will ignite and then turn itself off after a brief period. It will then reignite after a few minutes. It will continue to do this until the desired tempreture is met.

The Propane heater was installed sometime in the late 90's. It is believed that unit is 400,000 BTU. The operation and installation booklet is labeled "MiniMax Plus, MiniMax XL and PowerMax. The first time I used it after about 3 years of non use, it operated OK and reached 105 degrees in about 45 minutes. FYI - The spa contains about 5,000 lbs of water. I am quite handy and could repair myself with some guidance. Is there a repair service available in the Ormond Beach, FL area?

Posted by Anonymous on

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  • Expert
  • 116 Answers

Check the water temp reg. or "thermo reg" as it is called.

Posted on May 29, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

rcampsr
  • 90 Answers

SOURCE: Heater cycles on and of, pool/spa does not reach desired temp

hello, It sounds like you may not be getting circulation thru the heater. Make sure the valves are open to allow water to pass thru the heating system. Some systems use a bypass on the heater so there is not a lot of wear on the coil system in the heater. If it is not circulating it will get too hot and the safety shut down will occure. If you are getting water circulating thru the heater, then the thermocouple or auto start igniter system is not working correctly. It is trying to start and can't then recycles. If the burners are igniting on the startup and then shutting back down you may have a bad control unit or thermal sensor unit. Since the unit is gas have a professional service it for you. Good Luck, RAC

Posted on Apr 20, 2009

johnsonr1
  • 91 Answers

SOURCE: Pentair minimax nt 250,000 btu propane will

The service manual for your heater can be found here:
http://www.staritepool.com/pdfs/MiniMaxNTServiceManual.pdf

This should help in determining the problem and steps to resolve.

Posted on Aug 22, 2009

  • 128 Answers

SOURCE: minimax pool heater cuts out at 91 degrees when remotely set for

Check the temp reading on the heater. It is probably set at 91...heater control should be set to 104

Posted on Aug 30, 2009

  • 246 Answers

SOURCE: minimax 400 heater not operational

what is ok on the water pressure? th heater need from 40 to 60 gpm in order to work properly clean the filter and let me know

Posted on Sep 11, 2009

  • 990 Answers

SOURCE: E04 message on MiniMax NT 400 DV..Help!!

Your EO4 message tells you you have a fan problem. So ether your fan is diying wich you would hear or you have a bad presure sensor in your exaust. A new fan is a little pricey but the sensor is reasonable for heater parts. I can't be sure but I believe it ether screws onto or into your exaust and it just plugs on to your control board. If your sensor is going bad their is a reason and this should be addressed. It should be in your by-pass or your gas pressure. But as far as a new heater, not untill you have water coming from the cabnit. It is sometimes easer to sell new than keep up with new, Good luck let me know how you do.

Posted on Dec 03, 2009

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