Question about Pentair Mastertemp Heater

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

Heater reaches within 1 degree of desired temp then cycles on and off every 20 seconds. I have changed thermistor and thermal regulator. Do I need a new control board?

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  • William Kerry
    William Kerry Apr 19, 2014

    I also replaced the temp high limit switch. It doesn't matter if I set the water temp to 95 or 102 or anything else. The cycle problem begins within 1 degree of the selected temp. It's as if the system is too sensitive to temperature fluxuations.

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  • Pentair Master
  • 1,448 Answers

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

Posted on Jun 10, 2014

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Posted on Jan 02, 2017

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rcampsr
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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

  • 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

adamh294
  • 310 Answers

SOURCE: Pentair MasterTemp 400 Heater Will run fine for

This reminds me of some of the High temp sensors ive replaced. I would start with checking the pumps flow to the heater. Make sure there are no abstructions and at least 35 GPM (gallons per minute) running to the heater. If your flow is too low, you will trip the high limit sensor after a short while.
This could also mean you need to clean out the heat exchanger. When an exchanger gets dirty, it blocks the flow of water, slowing it down and "super heating" itdue to the water being in contact with the exchanger for too long. This will also trip the high limit and call for service.
If both the above items check out, contact me @ adamh@newconceptchem.com and I will guide you further.

Posted on Nov 23, 2010

  • 910 Answers

SOURCE: Pentair Master Temp 400 E05

If you've already changed the thermal regulator then the only other thing it could be is the flue/flame sensor.

It could be just a loose or bad connection so I'd check them first before replacing it.

If you've got a meter then you could disconnect the sensor and check its continuity (should be 3-4M Ohms). If its OK then check the continuity of the wiring between the sensor and board.

Posted on Jun 12, 2011

  • 1 Answer

SOURCE: 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

Posted on Jul 23, 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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MasterTemp 200 cycles every 30 seconds


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

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controller temp sensor bad

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What temperature does a pentair high limit switch trip


check gas pressure if ok check burner tubes over heating

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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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Have a brand new Master Temp 400K Propane with an Intellitouch and the heater shuts off at 84 degrees. Do I need to set a max temperature from the heater control panel?


If this heater has pool mode and spa mode as an option, and you need the water higher than 84 degrees, you must set it to spa mode even if it is a pool. As a regulation, these heaters come pre-set to max out at 84 degrees as a safety feature. However, in spa mode it can reach 104degrees.

Jan 11, 2011 | Pentair Mastertemp Heater

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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

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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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