Minimax NT not heating the spa above 90-91 degrees

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mirots
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Joined: Mon 29 Nov, 2021 10:49
My Pool: In ground, Minimax NT 400 heater, Polaris variable pump

Minimax NT not heating the spa above 90-91 degrees

Postby mirots » Mon 29 Nov, 2021 10:51

Hi,

I have an old Minimax NT 400 heater which is still working. I am usually taking care of it on my own. I have a weird issue that Spa is not heating up above 90-91 degrees - thermostat led goes off when this temperature is reached and the heater stops until temperature goes down. If I switch the heater to Pool - it continues to heat above 91 degrees. There is a new yellow wired thermistor and the temperature shown on heater is correct. The set point for Spa is 104 degrees.
This happens in remote control mode also.

Any idea what could be the problem?

Thanks.


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Denniswiseman
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Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Minimax NT not heating the spa above 90-91 degrees

Postby Denniswiseman » Tue 30 Nov, 2021 10:37

Not sure of your setup but if the pool will heat above 91 then I would assume that it is the spa thermostat that is faulty
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Teapot1
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My Pool: 12000 gallons vinyl liner,

Re: Minimax NT not heating the spa above 90-91 degrees

Postby Teapot1 » Tue 30 Nov, 2021 10:50

Seconded, nothing lasts forever.
I may not give you the answer you want to hear, but I will give an honest opinion of your situation as you decribe it.
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