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We have a pentagram minimax nt pool heater. Recently

Customer Question
replaced the air flow switch...
We have a pentagram minimax nt pool heater. Recently replaced the air flow switch . Ran fine for a few days but now it only heats to 81 when its set to 85 and then we get ee02 error code. Just replaced the thermistor probe but it still won't heat past 81. I hear and smell the gas kick on. Fan blows air just fine. Not sure what else to replace now.
JA: Sometimes pool issues that that you think will be really complicated end up being easy to fix. The Pool Technician I'm going to connect you with knows all the tricks and shortcuts. Is there anything else the Pool Technician should be aware of?
Customer: We replaced the fan last year. It's about 9'years old
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Pool Technician about your situation and then connect you two.
Submitted: 1 year ago.Category: Pool and Spa
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Answered in 1 hour by:
6/10/2016
Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago
garrygoeson
garrygoeson, Home Appliance Technician
Category: Pool and Spa
Satisfied Customers: 469
Experience: Over 27 years Repairing Pool & Spa Equipment,Gas Heaters,& Whirlpool Bath Tubs. Certified by many Pool & Spa Manufacturers.
Verified

Hi;

My name is Garry. I'll be glad to assist you with your heater.

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Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

You most likely have a PENTAIR Minimax NT heater. If you are getting the "E02" error code on the display, this stands for High Temperature Limit Failure.

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Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

You want to first check the flow of water into the heater to make sure it is not restricted by the filter, excess leaves or other debris in the filter pump basket, or some other cause. Let me know what you find and we can continue from there. Thank you.

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Customer reply replied 1 year ago
how do we fix the high temp limit? Is that another sensor we should replace???
Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

There are 2 Hi Limit thermostats located on the in/out Top-Sub Header Assembly. One is set shut the heater down when the INTERNAL water temp, (inside the Header), reaches 115 and the other will shut down at 150 degrees F.

If there is some external cause, such as a flow issue, as I mentioned earlier, then replacing the 2 Hi-Limits will not solve the problem. If you just want to replace them anyway, if you feel they are faulty, here are the part #'s: 471587 & 471694.

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Customer reply replied 1 year ago
Are here any other ways to verify the flow??
Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

Since you are getting the heater to go to 81, before you get the error code, the flow MAY be ok? However, if you want to verify that it is not dropping at the time you get the error code when the heater shuts down, you could install a Flow Meter on the return line to the pool. If you are at the heater at the exact time it shuts down, you can touch the in/out Header to feel if it is very hot, indicating a lack of water.

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Customer reply replied 1 year ago
If I want to replace the hi limit sensors are the 2 parts you mentioned earlier how do I tell which one on the heater matches the part number?? When I look online those parts come up as the 115 hi limit switch and 150 hi limit thermostat.
Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

Remove each Hi Limit, and look on the side, (the metal part) and the temp numbers should be stamped on them.

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Customer reply replied 1 year ago
Ok thanks. I don't think it's a flow problem as we have a chlorinator as well and when the there are flow problems that will show a red light for flow and that doesn't happen when we get the error code. There a 3rd part that I see by the temp switches. I looked up the part and its a pressure switch. Part not 473605. Could that be an issue? These switches heat up when the heater is working. Could they be hearing up so hot themselves that the hi temp switches is triggered??? Something is reading the temp wrong so that it trips that limit but I just ain't know what that is.
Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

It is very unlikely that it is the pressure switch! The hi limits are called "Safeties", and are there to protect the heater from severe damage. They will only heat up if the temperature of the in/out header gets too hot. This condition is usually from the water entering the heater not moving at a steady rate, or not enough water entering the heater due to lack of flow. To find the exact cause involves troubleshooting the heater. It could also be possible the H- Limits are just faulty, and will need to be replaced.

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Customer reply replied 1 year ago
Just so I'm clear the h limits you are referring to are the 2 parts you mentioned earlier??
Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

Yes. They are circular shaped, located near the pressure switch on top of the Header.

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Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

If you feel the information I supplied was helpful, please submit a Positive Rating, as this is the only way I get credited for assisting you with this. If you have additional questions on this topic, just post them here, and I can continue helping you as often as you need.

Thank you very much!

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Customer reply replied 1 year ago
One more question, we currently have a Hayward .5 horse power pump but we know that the pipes can take up to a 1.5 horse power pump . At least that is what our pool guy said when we had work done last year. Could it be a pump issue???
Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

Are you telling me your pump is 0.5 H. P., or is it 5 H.P.? See if your pool guy can tell you how many GPM (Gallons Per Minute) your pump sends to the heater. The heater is designed to run between 20 to 120 GPM, depending on what model heater you have.

If your pump is 0.5 HP, it is possible to be too low on GPM, and if it's 5HP, it's possible it could be too high on GPM.

Let me know what you can find out on this. Thanks.

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Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

If you want to know the exact number of Gallons Per Minute for your heater , tell me the model #.

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Customer reply replied 1 year ago
We have a Hayward super pump. Model number s48h2n122b1. 1/2 hp
Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

I'm sorry for not making it really clear. I need the model and serial number of the heater. The minimum GPM dependes on the heater size that is determined by the heater model.

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Customer reply replied 1 year ago
Pentair heater minimax 250 dv. Heater identification nbr is htr 250 nt std nh. Also says 125 psi working pressure
Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

The minimum GPM for a 250 heater is 30. Depending on the amount of distance the pump is from the heater, and other engineering factors, there may be a possibility the pump could be under 30 GPM. I would have no way of knowing what it is pumping since I can't see the set up of your system. Maybe your pool tech can determine what the GPM is?

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Customer reply replied 1 year ago
I really don't think it's the pump as we have had the same one for several years and the heater never had issues until this year. We are at our wits end and really don't know what else the problem could be
Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

If you can verify you are consistently getting good water flow to the heater, you can replace the 2 hi- limits. Since you're getting that fault code, and the hi-limits are not opening because they are getting too hot, it is possible they can be defective.

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Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

​I sent you the info with the part numbers on June 10.

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Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

Are you interested in replacing the Hi-Limit Switches? I have given you the best alternative based on what you are telling me about water flow.

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Customer reply replied 1 year ago
We replaced one of them. The outtake switch. It didn't fix the issue. I need to order the other one.
Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

OK. I'm hoping the other one will resolve it for you

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Customer reply replied 1 year ago
There is another part that has a model of 472125 which the Internet says it's a pressure switch. What does this part do and could it cause an issue as well??
Pool and Spa Expert: garrygoeson, Home Appliance Technician replied 1 year ago

I am basing my suggestions on the fault code you state you are seeing, "E02". If the light on the left of the display, "PRESSURE SW" is staying lit when the problem occurs, I would not consider it to be the pressure switch.

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Satisfied Customers: 469
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Experience: Over 27 years Repairing Pool & Spa Equipment,Gas Heaters,& Whirlpool Bath Tubs. Certified by many Pool & Spa Manufacturers.

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