By Pentair Pool Products



Part # 6290-080

Manufacturer Code 42001-0053S

Dimensions 3" L x 0.75" W x 0.75" D

Alternate Part #'s 420010053S, 47-102-1312, PEN420010053S

Product Description

THERMISTER (42001-0053S)


?     Asked on 1/7/2016by Inyo Visitor

is this the part that tell the heater tempature?

A  Answered on 2/3/2016 by InyoPools Product Specialist Megan C.

Yes, the 42001-0053s Thermister is used to detect the temperature of the pool water entering the heater.

?     Asked on 2/19/2016by Moliner

I need to replace Thermistor in my Sta-Rite Gas pool heater. Can you help how

A  Answered on 2/23/2016 by InyoPools Product Specialist Lennox H.

Hi Moliner, We do not have installation instructions on how to replace the Thermistor. I would recommend consulting a pool professional to have this item replace if you're not sure on how to replace it.

?     Asked on 3/22/2020by Thomas Jackson

How can I check to ensure mine is bad?

A  Answered on 3/23/2020 by InyoPools Product Specialist Lennox H.

Hi, Thomas. You can test the resistance to determine if it's faulty. You will have to reference your unit's owner's manual. 

?     Asked on 5/23/2020by Kit Houser

Will this part work on STR-RITE SR400LP 42001-0053s

A  Answered on 12/3/2020 by InyoPools Product Specialist Hector F.

Hi Kit, yes this thermistor is compatible with the Sta-Rite model SR400 Max E Therm pool heater. 

?     Asked on 5/28/2021by Robert Manno

Does this part fit the Sta Rite Pool Heater SR333LP?

A  Answered on 5/28/2021 by InyoPools Product Specialist Patrick P.

Yes this does fit a Sta Rite Pool Heater SR333LP


Est. Repair Time

Less than 1 hr

Tools Needed

Screwdriver, Socket Set, punch

3     0

Heater did not ignite

Written on 11/11/2019 by Guest

I ran through troubleshooting in manual, that did not cover the problem. Then I realized the number 126 was what the heater thought the water temp was, and did not think it needed to ignite.

In removing the old thermister, I found that it had corroded and the new one did not fit. This necessitated removing the manifold with 6 bolts, and clearing the hole. Then it fit. Reassembled, "We have ignition". Nothing complex. I used a small punch to scrape the corrosion. Less than 45 minutes total.

Were these instructions helpful? 


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