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MasterTemp 200 cycles every 30 seconds

Spa heater. MasterTemp 200. 3 years old. No salt system in use. Worked fine until 2 weeks ago. When temp gets within 1 degree of set point (eg 98, 99, 100, etc) the heater begins to cycle on and off every 30 seconds. I replaced the thermistor and the thermal regulator with no change. Please help me to troubleshoot this problem. Thanks. Bill Kerry

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

Posted on Apr 20, 2014

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try to replace the thermo sensor it is located on the left side of tghe unit and has 3 wires running to it.

Posted on Jun 13, 2009

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Anytime the heater is reading the water temp to be above what it actually is, especially 126, the problem is the Thermistor, or Temp Sensor, for the heater. This is a very easy part to replace. The Thermistor is located on the manifold, on the left side, between the top two bolts.

Sorry this is a late response! Hope that it helps!

Posted on Jul 10, 2009

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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.

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SOURCE: Pentair MasterTemp 400 Heater Will Not Fire

Long story but bingo just at the end. The thermistor is generaly the problem with what you describe. it is an inexpensive part and easy to replace. You will not generaly find this in your book. Your E5 code is just because the unit hasn't started yet. Good luck.

Posted on Jan 26, 2010

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SOURCE: I have a Purex Triton MiniMax 400 that is cycling

i have the same problem and i jumped the two red wires to bypass the thermal switch

Posted on Apr 09, 2010

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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

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

I have a Pentair Mastertemp 400. It worked fine for 3 years until the temp sensor went out and both (internal and external) were replaced about a year ago. It then worked fine for about another 7-8...


You might have a much bigger issue than the temp sensor. When the heater is running hold the "pool" or the "spa" button for 12 seconds. This will show the exhaust temp, if the temp is rising above 375 degrees with in 1-2 mins then your not getting the heat out of the heat exchanger.
One other thing to check would be an external by-pass. If you have an external by-pass make sure the by-pass is set correctly. Opened or closed to much can cause the problem your having.

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I have a Pentair Mastertemp 400 using LP that stopped firing 2 weeks ago. Troubleshooting showed igniter so I replaced it and all worked fine. Old one still showed about 50ohms but was still replaced. The...


Is it Propane or Natural gas? Check your gas supply pressure.Also, open up control panel, accessable by removing the plastic exterior panel with 4 screws, check to make sure no critters got in and chewed wiring.

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Pentair matertemp 400,000 BTU heater cycles on & off


My pentair matertemp 400,000 BTU natural gas heater cycles on and off before reaching desired temperature. I completely cleaned the DE filter and flow should not be an issue. When running the spa the pressure is 25. When running the cleaning system (polaris pop ups) the pressure is 30. Burner fires for 80 seconds then shuts off, reignites after 53 ceconds.Any tips on what might be the issue with the heater

Apr 04, 2010 | Pentair Mastertemp Pool & Spa Heater Dual...

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Tonight my master temp 250 heated the spa to 80 degrees. I went out to jump in and saw error code E05. I shut it down and killed power for a little while. Restarted system, blower kicked on, burner light...


You are right about the ignitor. Depending on how old your heater is. The ignitor can become weak and flame rectification will be intermittent. You may have to replace the ignitor assembly or at lease check to see that it's not corroded enough to impede gas flow.

Oct 28, 2009 | 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

1 Answer

Service light on


I just had the same problem resolved, my mastertemp 400 would run up the temp to 82F and then cutoff, the service light flashes and then 50 seconds later the heater would restart and run for 2 minnutesbefore shutting down again and relighting in 50 seconds. Repeating until the temp setting is reached.

I had the pool guy out 3 times until he found a bad thermal regulator valve (kit #77707-0010). Once replaced the heater runs great.

He told me that it's my pool chemestry that is to blame, I had it checked (like I do weekely by me and monthly by the pool supply store) and it perfect??? I'm now questioning what caused the corroson and stop it from coming back?

I hope tis helps.

Jan 17, 2009 | Pentair Mastertemp Pool & Spa Heater Dual...

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