My water is too hot eemax sp 90 - Water Heaters

Contact their Support direct. It may be low water pressure.

https://www.eemax.com/products/eemax-flowco/spex3512

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Technical Support Tankless Water Heaters Eemax

The EEmax must restrict the flow of water in order for the elements to have more time to heat it.

Heavy current required for instant hot water may be switched via a relay or contacter which may be faling. One way to diagnose may be with cover off and careful listening and visual inspection, but a risky process for inexperienced DIY'er's ??. Pro time?

Check if thers incoming water. Ur heater dependent on the level of water

see if the circuit breaker switch has tripped either partially or fully and reset it. Check for bad or loose wiring on the heater and breakers. The next thing is more likely the heating element is no good and needs repaired or the heater needs replaced.

Call the rep!

It runs off 220v, meaning there are two "hots" and a ground. The 190tc uses TWO sets of 220v at 40amps each. Instead of only having one dbl throw breaker, you need 2. Having said that... the white wire "should" be the same as the black wire and can be connected which ever way you like

in and out hooked up right?

you can check elements with a meter to see if they are any good. how old is heater?