How do I fix an E90 error code on my Intex hot tub?

Alton Alexander
By Alton AlexanderUpdated on June 3rd, 2022

The E90 error code on an Intex hot tub indicates that the water temperature in the tub has exceeded 110 degrees Fahrenheit. This can happen for a variety of reasons, including the tub being left on for too long, the water being too hot when it was first added, or the heater being set too high. If the E90 error code appears, it is important to immediately turn off the heater and allow the tub to cool down before restarting.

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1. Check the power supply to the hot tub

  1. Turn off the power to the hot tub by flipping the breaker switch.
  2. Go to the electrical box and locate the power cord for the hot tub.
  3. Unplug the power cord from the electrical box.
  4. Open the cover on the hot tub and locate the power cord.
  5. Make sure the power cord is plugged into the power outlet and that the breaker switch is turned off.
  6. Reconnect the power cord to the electrical box.
  7. Turn on the breaker switch and test the power to the hot tub. If the power is not working, then the power supply to the hot tub may be defective. The power supply may need to be replaced.

2. Check the spa pack for a loose connection

  1. Remove the cover on the spa heater
  2. Remove the screw that attaches the heat exchanger to the heater
  3. Use a small flat head screwdriver to remove the two screws that hold the heat exchanger in place
  4. Lift the heat exchanger off of the heater
  5. Check the connections between the heat exchanger and the heater
  6. If there is a loose connection, replace the heat exchanger.

3. Check the flow switch for proper operation

  1. Look for any obstructions in the water flow. If the flow switch is not functioning properly, debris or other objects can get in the way of the water flow and prevent the switch from functioning. Remove any obstructions from the water flow.
  2. If the flow switch is not functioning properly, you may need to replace the switch.
  3. Test the flow switch by turning it on and off.

Still not working? maybe try one of these options:

  1. Check for clogged filters.
  2. Check for clogged jets.
  3. Check for leaks in the plumbing.
  4. Check the chemical levels in the water.