I have an intex purespa that has stopped heating due to no water flow (code 90). When i turn on the filter button, the unit turns off within seconds. I turned the filter on and pumped air through the inlet hose with an air pump, the unit stayed on. This leads me to believe the problem is with whatever motor filters the water through the system. Does anyone have any idea which part of the unit would house that? Pictures are appreciated!

Question edited for clarity, name of maker.
Question moved from washing machines.

For water rushing out, try and block from the other side so water doesn't reach the part you are undoing. Here is a parts diagram and all the washers and O-rings. Your local pool supplier probably carries them.

https://www.pools.shop/en/intex-spare-parts/whirlpool-pure-spa-bubble-small-1

More here

https://www.google.com/search?q=Intex+Purespa+SB-H20+parts

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Low Flow Error. Check valves are fully open and basket filters are clean. Videos that my help.

https://www.google.com/search?q=Code+90+on+my+Intex+Salt+Water+ECO15110-2

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are you sure its not e99 water temp sensor because their is no 999 code for intex -----------turn off at gfi and unplug for about 5 minutes then plug back in unit some times glitches if code comes back same then notify intex [ good luck ] of code 999--any other code can be found in manual or online ----intex purespa code === ----

intex pumps have a fatal flaw -its a magnetic pump using a ceramic rod that breaks so no water flow --no flow will shut off heater

The E90 code on the Intex spa is due to a dirty water flow sensor. ... The black wire is plugged into a white wire, carefully unplug it and unscrew the sensor. Clean it good and blow out the hole it goes in. This will fix the code and you will be back in business https://www.justanswer.com/pool-and-spa/ap9qh-i-m-having-error-code-90-intex-hot-tub-intex.html

means temp to low and the last link is the answer from intex they stat to unplug system then replug but when the pump goes that causes same code since no water flow no water flow your pump has failed these pumps are a magnetic with a small ceramic rod to hold it in place the ceramic rod breaks and stops pump -- intex doesnt sell parts or replacement pump ---easy fix is to go to lowes they sell a brass rod about $4 or home depot and in welding isle is a package of brazing rods [[ brass ]] with a flux covering $ 10 dollars clean the flux off and measure rod about 3 inches is needed How to repair Intex PureSpa pump E90 Error 90 Intex Pure Spa E96 slow reset solution these links can assist http://www.intexcorp.nl/faqsup/pub/FaqSupportServlet?action=openFaq&qid=608&lst_prd=853&lst_subcategory=854&frmcontact=

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when mine does this, I open the skimmer cover until I can hear air escaping. Let some air out and then turn the cover back on. Also I will turn the valve open on the intake hose and then put back on. Just keep doing things like that to get the water flow started. It eventually starts.

I found a forum on this issue at http://www.troublefreepool.com/intex-swg-code-of-90-t24319.html. I hope this gets to you and helps. If it doesn't then search "intex code 90" in a web browser.