Question about Pentair Mastertemp Heater

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Pentair mastertemp 200 is heating past the desired temp

Posted by Anonymous on

6 Suggested Answers

  • 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

  • 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

  • 1378 Answers

SOURCE: Have a Pentair MasterTemp 400

Thank you for posting your question here on

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...

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 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.

Feb 22, 2015 | Pentair MasterTemp Pool Heater 200, 000...

1 Answer

After 128 r13 displays, service system displays. What is wrong?

A lot of things could be wrong. Sounds like your not to mechanical, you could start with the air flow switch. I think it would be safer for you to call a heater pro.

Jun 15, 2014 | Pentair Mastertemp Heater

1 Answer

How to reset pentair master temp to factory default

There is no reset on the mastertemp. All that changes is the temperature settings. DO NOT push the yellow button on the back of the cpu board.

Jun 02, 2014 | Pentair Mastertemp Heater

1 Answer

Brand new master temp 250 won't kick on to heat~ getting error code r13

r 13 is not an error code that is a program that runs at startup when the power is applied then the display goes blank, now you push pool on button and it should work

May 23, 2014 | Pentair Mastertemp Heater

1 Answer

Pentair mastertemp 200 cycles on and off within 1 degree of set point

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

Apr 18, 2014 | Pentair Mastertemp Heater

1 Answer

MasterTemp 200 cycles every 30 seconds

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

Apr 18, 2014 | Pentair Pool & Spa

1 Answer

Pentair MasterTemp 200 is not turning on the screen is not showing anything, i don't even see a light. The guy hook it to a power source, but we see nothing.

There is probably no power coming to the heater. The guy who connected it to a power source should be able to get you going again. If not then if you have a friend or neighbor who can help you look for the problem then that is an option. If you are still stuck then you could contact Pentair technical support at 800-693-0971 and they may be able to help you figure out the next step.

I hope this helps.

Sep 14, 2011 | Pentair Mastertemp Heater

1 Answer

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

Apr 20, 2009 | Pentair Mastertemp Heater

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