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Thread: StaRite MaxiTherm SR400LP Code and Spa Level Question

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    StaRite MaxiTherm SR400LP Code and Spa Level Question

    Tonight my heater was cycling on and off with error code of 128 r=5 code showing, any ideas? I seem to remember the last couple time this happened it was I believe the high limit switch or thermal switch. Can anyone also give me a walk thru on replacing what ever it might be.
    On another note I have also noticed that when the spa and heater is turned on I'm seeing about 2 inch drop of water out of the spa, with the spa off and in pool mode water level is A'ok. I have checked all the auto valves for leakage and good there. Any ideas
    See my sig for any additional info. Thanks
    18k free form IG w/spa (4 jets), Paramount in floor cleaning system, Starite system 3 filter, Jandy 2hp ePump, Sta-Rite SR400LP Maxi-therm propane heater, Jandy aquapure/apurem 1400 SWCG, Jandy automation PS4 w/PDA, IntelliBrite 120v 5-G LED pool & spa lights, 2" piping and (3)4x12 (5)4x10 Fafco Sunsaver Solar Panels.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    http://www.pentairpool.com/pdfs/MaxEThermOM.pdf

    Does the heater start (heat up) and run fine for a few minutes then shut off?
    Does the blower operate?
    Which of the red diagnostic LED's are on?

    It could be the fuel supply, pressure switch (PS), high limit switch (HLS), automatic gas shutoff (AGS), stack flew sensor (SFS), or thermal regulator.

    Verify the proper flow rate of water for your heater. The model 400 needs a minimum flow rate of 40 gpm.

    With an error code of E05, first check the fuel supply, next the SFS and finally thermal regulator.
    If SFS LED is on then it could be the sensor itself or the thermal regulator.
    Disconnect the stack flew sensor and test. It should have a resistance of 3.5 to 4 mega-ohms.

    If Exhaust Gas temps > 450 and SFS is ok then next check the Thermal Regulator.
    On the left side of the water manifold is a plug. Behind this plug is an o-ring, spring, and Thermal Regulator.
    The Thermal regulator looks like a thermostat used in automotive applications. It should open at about 120 degree F.

    Should you suspect the thermal regulator, it may be advisable to replace the spring and o-ring as well.
    Thermal regulator kit includes the o-ring, spring, cap, spring clip and regulator and is only a few dollars more.

    There are several experienced service techs on this forum. Hopefully someone can guide you through the diagnostic checklist.

    ** Information in this thread is based on diagnostic information provided by the manufacturer**
    ** I do not own this equipment, nor am I a factory trained service technician **

    Pentair
    Customer Service and Technical Support (8 A.M. to 5 P.M. Eastern Time/Pacific Time)
    Phone: (800) 831-7133
    poolschoolgrad

    20x40 free-form IG vinyl, 1hp Hayward superpump, Hayward pro grid DE filter, Raypak heatpump, Goldline Aquarite SWCG, Polaris 280 with booster, and tested using a Taylor K2006.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    Starts up fine and runs/heats for about a few minutes before it cycles off. Flow rate is good, propane is at 80% and blower is working. I have had this issue twice before and if I remember it was either HLS or PS. The heater will heat up the water but continues to cycle on/off every few minutes. Thanks
    What am I looking for with respect to the LED light?
    18k free form IG w/spa (4 jets), Paramount in floor cleaning system, Starite system 3 filter, Jandy 2hp ePump, Sta-Rite SR400LP Maxi-therm propane heater, Jandy aquapure/apurem 1400 SWCG, Jandy automation PS4 w/PDA, IntelliBrite 120v 5-G LED pool & spa lights, 2" piping and (3)4x12 (5)4x10 Fafco Sunsaver Solar Panels.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    There are red diagnostic LEDs on the back of the board. (AGS, AFS, SFS, HLS, PS or THERMISTOR) are any of these on?
    poolschoolgrad

    20x40 free-form IG vinyl, 1hp Hayward superpump, Hayward pro grid DE filter, Raypak heatpump, Goldline Aquarite SWCG, Polaris 280 with booster, and tested using a Taylor K2006.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    Quote Originally Posted by Poolschoolgrad
    There are red diagnostic LEDs on the back of the board. (AGS, AFS, SFS, HLS, PS or THERMISTOR) are any of these on?
    I will check the board tomorrow and get back to you. Thanks again. The Tech I use charges 80 bucks service charge plus what ever else. This same issue has happened twice in the last couple years. By the way what's the r=5 (not r05) code that shows up after the 128 code?
    18k free form IG w/spa (4 jets), Paramount in floor cleaning system, Starite system 3 filter, Jandy 2hp ePump, Sta-Rite SR400LP Maxi-therm propane heater, Jandy aquapure/apurem 1400 SWCG, Jandy automation PS4 w/PDA, IntelliBrite 120v 5-G LED pool & spa lights, 2" piping and (3)4x12 (5)4x10 Fafco Sunsaver Solar Panels.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    Service techs from pool stores are $80/hr here also.
    Independent techs charge $65/hr.
    In most cases they are worth every penny. Especially on a pool heater.

    Do you have a way to test the exhaust gas temperature? Infrared thermometer?
    It should be around 250 F, but if you see temps in the 450-500 F range then the problem may be more than a bad sensor.

    Current firmware as of 2008 from Pentair uses error codes like r05.
    Previous firmware from Sta-Rite may use a different format like r=5. You could contact Pentair to be certain.

    Code r05 on the board indicates dangerously high temperatures in the system and the system shuts down.
    This could be caused by something as simple as a faulty sensor or by a true overheating condition.

    Just because the last two times this happened it was the result of a faulty sensor, one should not immediately jump to the conclusion that it is a bad sensor. The diagnostic LEDs and the exhaust temperature will help determine the correct plan.
    poolschoolgrad

    20x40 free-form IG vinyl, 1hp Hayward superpump, Hayward pro grid DE filter, Raypak heatpump, Goldline Aquarite SWCG, Polaris 280 with booster, and tested using a Taylor K2006.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    Led Lights

    Heater will heat for about 5-10 min then cycle off/on
    HLS Led lights up red and Led #11 lights Red

    Both HLS and Thermistor were replaced but problem still exists. Thnx.
    18k free form IG w/spa (4 jets), Paramount in floor cleaning system, Starite system 3 filter, Jandy 2hp ePump, Sta-Rite SR400LP Maxi-therm propane heater, Jandy aquapure/apurem 1400 SWCG, Jandy automation PS4 w/PDA, IntelliBrite 120v 5-G LED pool & spa lights, 2" piping and (3)4x12 (5)4x10 Fafco Sunsaver Solar Panels.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    Does the water coming out of the heater seem hotter than normal?

    Check the Thermal regulator. It may be stuck closed.

    Manifold bypass valve may be stuck open.
    poolschoolgrad

    20x40 free-form IG vinyl, 1hp Hayward superpump, Hayward pro grid DE filter, Raypak heatpump, Goldline Aquarite SWCG, Polaris 280 with booster, and tested using a Taylor K2006.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    Water temp coming out is at normal temp. How do you check to see is the regulator is closed, pulled it out but did not know what I was looking for. Did not get to the manifold.
    18k free form IG w/spa (4 jets), Paramount in floor cleaning system, Starite system 3 filter, Jandy 2hp ePump, Sta-Rite SR400LP Maxi-therm propane heater, Jandy aquapure/apurem 1400 SWCG, Jandy automation PS4 w/PDA, IntelliBrite 120v 5-G LED pool & spa lights, 2" piping and (3)4x12 (5)4x10 Fafco Sunsaver Solar Panels.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    Thermal regulator operates the same as a thermostat in automotive applications except it opens at about 120 degree. You could place it in a pan of hot (>120 F) water to verify that it will open.

    If output water temps are normal and exhaust gas temps are normal and there is no evidence of blockage, then this may be a control board issue.

    However, before you spend the $$$$ for the control board, please contact
    Pentair
    Customer Service and Technical Support (8 A.M. to 5 P.M. Eastern Time/Pacific Time)
    Phone: (800) 831-7133

    Suggested retail on these boards is $695. They are available on-line for much less.
    poolschoolgrad

    20x40 free-form IG vinyl, 1hp Hayward superpump, Hayward pro grid DE filter, Raypak heatpump, Goldline Aquarite SWCG, Polaris 280 with booster, and tested using a Taylor K2006.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    r=5 would be the software revision of the board (revision 5)

    E05 would be a stack flue sensor error (exhaust temp sensor), either too high too low shorted or open

    Do as poolschoolgrad suggested and test that regulator, that sounds like the real issue.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    Thanks poolschoolgrad for all your timely help. I put the regulator in close to boiling water and it does not open, so looks like this is the issue. Since I already have the tech coming out tomorrow I will direct him to this first, he's also doing some warranty work on my solar also. I will report back after the service call to give the final diagnosis for future reference. Thanks again.
    18k free form IG w/spa (4 jets), Paramount in floor cleaning system, Starite system 3 filter, Jandy 2hp ePump, Sta-Rite SR400LP Maxi-therm propane heater, Jandy aquapure/apurem 1400 SWCG, Jandy automation PS4 w/PDA, IntelliBrite 120v 5-G LED pool & spa lights, 2" piping and (3)4x12 (5)4x10 Fafco Sunsaver Solar Panels.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    Hope it is only the Thermal Regulator as the repair would be relatively inexpensive.

    If possible, could you ask the service tech specifically about the error code 128 and the LED #11.
    There is nothing in the current Max E Therm documentation about this code or this LED.
    poolschoolgrad

    20x40 free-form IG vinyl, 1hp Hayward superpump, Hayward pro grid DE filter, Raypak heatpump, Goldline Aquarite SWCG, Polaris 280 with booster, and tested using a Taylor K2006.

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    Re: StaRite MaxiTherm SR400LP Code and Spa Level Question

    led 11 is the service heater light from the front

    128 doesn't mean anything, it will show every time then go away. 126 staying on would be a temp sensor though.

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