Question about Pentair Minimax NT Heater

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Our heater show's Eo4 never gets hot

Our heater hot tub SPA never get hot and show's temp EO4 and we change everything

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  • Anonymous Mar 22, 2014

    On my L.A. Spa Oasis I am getting an error code which looks like 505 or S0s or 5U5 or SUS. It is hard to make out the code. Thinking that maybe an led is out on the middle digit. What does this code mean? I cannot use my hot tub :-(

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Lol but u never clean t burners

Posted on Sep 14, 2009

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


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The EO4 is listed as a Fan Failure. However, these heaters have a tendency to go EO4 for no apparent reason. It is what I call the "heater hic-cupping". The easiest thing to try first is to reset the heaters computer. To do this, you will open the right hand side door, find the POWER toggle switch and move it to OFF. Then turn off the Circuit Breaker to the heater,shutting down all electrical power to the unit. You will need to wait about 15 to 20 minutes before you do anything else.

After that time, revese the order. Turn on the Circuit Breaker, then the Power Switch on the heater. Try and start the heater. The computer will "reboot" flashing codes like --- or 888, do not worry about those. When the display panel comes back to normal, check what the heater is reading for a water temp and compare that to what the water is actually. Hopefully, they will be right on, or close, together. The heater will try to start 3 times before going into "Lock Out" mode.

If it does start, it was just the computer hic-cupping. If it does not start and you receive another EO code, on the backside of the Display Panel, there are Diagnostic Lights. If there is a light on by a couple of letters, like HLS or PS, then that is what is malfunctioning.

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I am not sure if you have gotten this issue corrected, or not, but the first thing I would try to do is to reset the heater computer system. This sometimes corrects and EO4 error code.

What you will do is open the right hand side door and find the POWER toggle switch, turn that off. Then find the CIRCUIT BREAKER for the heater and turn that off as well, then wait about 15 to 20 minutes. After waiting, you will turn the CIRCUIT BREAKER on first, then the heater. Try and start the heater up.

If the EO4 code comes back, there may be an issue with the heater. If the code does not come back and the heater starts, then the error code was what I call a "computer hic-cup".

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HEATER GOES OFF ON EO2 OR EO4 CODE . WATER FLOW IS 145GPM HEAT EXCHANGER IS CLEAN FAN WORKS FINE. VENT PIPE HAS BEEN CLEARED OUT THIS IS A MINI-MAX 400 I RUN A FAN BLOWING ON THE HEATER AND IT STAYS ON...


EO4 is the heater fan error, it may go on briefly and then shut off after only a few minutes. most likely cause is a blown fan-there is a thermal switch installed on the blower fan that shuts off the fan when it gets too hot. the only workable solution is to replace the blower fan unit completely also 145 GPM is a very high flow rate; normal residential pools operate in the 40-70 gpm range and 110+GPM on commercial pools if this is residential you may have too much pump for your system. 1 1/2-2 hp is standard if you also run an automatic vaccuum off the same pump

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