Pentair Minimax NT Problems?

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markwimbush

Pentair Minimax NT Problems?

Postby markwimbush » Thu 21 Feb, 2013 19:36

alanf_45 wrote:My Minimax NT problem is that I must cycle through the start-up 2-4 times before I get ignition. I turn it on, wait a few minutes, turn it off, wait, turn it on, wait, turn it off, and THEN on the 3rd try, I get ignition and it heats the spa just fine.
Two separate repairmen listened to this story and both told me the repair would be too costly, compared with the cost of a new heater. Both told me to replace the heater and not waste my time and money on repair attempts. I am adding solar water heating panels for the pool, and plan to replace the heater in a few months.

Anyone have a short term solution I can do myself? Pushing a few buttons on an X-10 keypad is NOT all that difficult.
Alan



fyi

there was a problem with gas valves not opening when powered. I rreplaced a few of them under warranty last year and the year before


Ronf16

Pentair Minimax NT Problems?

Postby Ronf16 » Mon 18 Mar, 2013 18:25

Bottom line, replacing the capacitor on the fan motor seems to have fixed the issue. Three years ago I had to replace the transformer. Heater worked fine for a while then started throwing E4 codes. At first occasionally until recently about every 2 degrees of heating. Then it started throwing an occasional E5 code. Read the post on here and ordered a $7 capacitor. Just put it in and it went all way through heating the spa. I am ready to declare it fixed. Thank you very much for the very insightful help.
Ishinc

Pentair Minimax NT Problems?

Postby Ishinc » Tue 19 Mar, 2013 17:08

Great information going on here! I have a question, I took off the vent plate on top, but all the see is the metal ducting to where the air is blown out. Where is the capacitor? Anybody have a picture??
Ronf16

Pentair Minimax NT Problems?

Postby Ronf16 » Tue 19 Mar, 2013 19:41

The whole plastic top just pops off after you remove the metal vent cover. Once you do that you can't miss it.
Ishinc

Pentair Minimax NT Problems?

Postby Ishinc » Tue 19 Mar, 2013 19:42

Figured it out! You have to removed the entire top cover (pops right off after removing the middle 2 screws of the vent) to see the blower motor and the capacitor. Looks like a easy replacement. I ordered my capacitor at Home Depot for $3.50 and it should be ready for pick up in a few days. I hope this works.
Ishinc

Pentair Minimax NT Problems?

Postby Ishinc » Tue 19 Mar, 2013 19:44

Thanks Ronf16! Looks like we were typing the at the same time!
Ronf16

Pentair Minimax NT Problems?

Postby Ronf16 » Tue 19 Mar, 2013 19:57

Good luck. I hope it fixes your issue.
wimbushmechanical
Pool Newbie
Pool Newbie
Posts: 6
Joined: Thu 21 Feb, 2013 18:40
Location: pool service

Pentair Minimax NT Problems?

Postby wimbushmechanical » Wed 20 Mar, 2013 08:32

The capacitor is part of the motor cicrcuit and usually fails due to problems with the motor. As a motor slows down (slips), due to overloading the capacitor sees a greater current as it works harder and harder to offset the motor slip. This will cause the capacitor to fail first. This does not correct the conditions that caused the failure and will not prevent the capacitor from failing again.
On pool heaters the usual problem is rusted bearings on the motor. These motors are constantly exposed to corrosive elements which can affect their lifespan.
Simply changing the capacitor will mean that at some later time, usually when it is most inconvenient, the motor will fail.
Mgeorge
Pool Newbie
Pool Newbie
Posts: 1
Joined: Wed 27 Mar, 2013 17:09
My Pool: 17000 gallon, indoor, salt water system, pentair pump and heater.
Location: Nashville TN

Pentair Minimax NT Problems?

Postby Mgeorge » Wed 27 Mar, 2013 17:30

I have a Pentair 25000 BTU heater that will not stay on for more than 1 hour. So far the ignitor and 2 sensors have been replaced but still the same problem. Now I'm told that it is an air flow problem due to the blower motor heating up therefore decreasing the fan speed. They said that a new blower motor will cost 400 to 600 and due to the age, 5 years, and amount of corrosion inside, I may be better off replacing the heater. This is a hotel pool which is getting lots of use and the heater sits outside. Also it's a salt water system, so does that come into consideration if I purchase a new heater?
On The Square

Pentair Minimax NT Problems?

Postby On The Square » Fri 29 Mar, 2013 12:05

Pentair 400 pool heater.
I have a in ground pool with attached hot tub.
The heater will start and burn while the water flow valves are on the pool side.
When the valves are switched to the hot tub the heater will come on for approx. 2-3 minutes and go off and in a few minutes it will come back and then off ect.
Help me

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