How do i fix the E code on one of my controls

I BELIEVE ITS A CONTROL BOARD ERROR CODE
ERROR CODE DEFINITION:Communication error between the main control board module - and display control module.
WHAT TO FIX/CHECK/REPLACE: Remove power to the refrigerator and reconnect any loose or non-secure connections on the wire harness for the main control board module and the display control module.
-Remove and Replace the wire harness if faulty.
-Inspect the main control board module and the display control module if faulty.
PARTS THAT MAY NEED TO BE REPAIRED OR REPLACED: Main Control Board Module -
SEE THE MANUAL ATTACHED

This is what your manual says about this fault code:
(00000101) Phase 1 - Communications Fault
The Display Module has had difficulty communicating with the Motor Control Module

Primary Source: Display Module. Action: Turn off at the wall and on again after 5 seconds
and try again.
1. Check connections of the 12 way harness for
bad contacts, corrosion etc.
2. Check for moisture in the console area. Dry
out if necessary.
3. If still faulty, replace the Display Module.
4. If still faulty, replace the Motor Control
Module. If the new Motor Control Module
corrects the fault, then refit the original Motor
Control Module

https://www.manualslib.com/manual/859287/Culligan-Medallist-Series.html?page=8

Quoting from link to free manual shown:

FAILURE MODE
There are certain conditions that can be interpreted by the circuit board as a failure of the drive motor or motor
position switch. Upon failure detection the control will cease further operation. A telephone hand set symbol will be
shown in the upper left corner of the display and the error code will be shown. Listed below are the different error
codes.
1. Motor Always Turning
Error code "E1" occurs when the circuit board detects changes in the motor program switch when the motor is
not supposed to be turning. The phone icon and "E1" will be lit in the display.
2. Motor Never Turns
The Culligan Medallist Series control is equipped to detect no change in the motor position when the motor is
supposed to be turning (motor or piston locked in a frozen position). The AccuSoft circuit board will apply
power to the motor for 20 seconds. If there is no change in the motor homing or position switch, the control will
power down for 1 minute. The circuit board will repeat this procedure two more times in an attempt to remove the
obstruction. If no movement has been detected, the control will permanently power down and a phone icon and
an "E2" will appear in the display.
3. Homing Error
Error code "E3" occurs when the circuit board detects when the control is unexpectedly in the home position.
The phone icon and "E3" will be lit in the display.
Error Display Cancellation
The error code display can be removed by removing the power to the control for 1 minute. After clearing an error
condition, the control will default to the factory settings when power is restored.

Question
What does code E90 mean? What should I do if code E90 appears on my air bubble spa control panel?



Answer
If alarm code E90 is displayed on the control panel, it means no water is flowing through the system. Check the attached troubleshooting guide.

Hi Tania,
Have you gone through this checking sequence.? it's from a Panasonic a/c manual. It could be something as simple as a clogged filter. Once you have rectified the fault, you will probably have to clear the fault code as described at bottom below, before it will condescend to work again.
David

• Once error occurred during operation, the unit will stop its operation, and Timer LED blinks.
• Although Timer LED goes off when power supply is turned off, if the unit is operated under a breakdown condition, the LED will ON again.
• In operation after breakdown repair, the Timer LED will not blink. The last error code (abnormality) will be stored
  in IC memory.

14.2.2 To Make a Diagnosis

1. 1 Timer LED starts to blink and the unit automatically stops the operation.
2. 2 Press the CHECK button on the remote control continuously for 5 seconds.
3. 3 "- -" will be displayed on the remote control display.
   Note: Display only for "- -" (No signal transmission, no receiving sound and no Power LED blinking)
4. 4 Press the TIMER ? or ? button on the remote control. The code "H00" (no abnormality) will be displayed and signal will be transmit to the main unit.
5. 5 Each press of the button (? or ?) will increase error code number and transmit error code signal to the main unit.
6. 6 When the latest abnormality code on the main unit and code
   transmitted from the remote control are matched, Power LED will
   light up for 30 seconds and a "beep" sound (continuously for 4
   seconds) will be heard. If no codes are matched, Power LED will light up for 0.5 seconds and no sound will be heard.
7. 7 The breakdown diagnosis mode will be canceled unless pressing the CHECK button continuously for 5 seconds or operating the unit for 30 seconds.
8. 8 The LED will be off if the unit is turned off or the RESET button on the main unit is pressed.

14.2.3 To Display Memorized Error Code (Protective Operation)

1. 1 Turn power on.
2. 2 Press the CHECK button on the remote control
3. 3 "- -" will be displayed on the remote control display. Note: Display only for "- -" (No signal transmission, no receiving sound and no Power LED blinking)
4. 4 Press the TIMER ? or ? button on the remote control. The code "H00" (no abnormality) will be displayed
   and signal will be transmit to the main unit.
5. 5 Each press of the button (? or ?) will increase error code number and transmit error code signal to the main
   unit.
6. 6 When the latest abnormality code on the main unit and code transmitted from the remote control are matched,
   Power LED will light up for 30 seconds and a "beep" sound (continuously for 4 seconds) will be heard. If no
   codes are matched, Power LED will light up for 0.5 seconds and no sound will be heard.
7. 7 The breakdown diagnosis mode will be canceled unless pressing the CHECK button continuously for 5
   seconds or operating the unit for 30 seconds.
8. 8 The same diagnosis can be repeated by turning power on again.

14.2.4 To Clear Memorized Error Code after Repair (Protective Operation)

1. 1 Turn power on (in standby condition).
2. 2 Press the AUTO button for 5 seconds (a "beep" sound is heard) on the main unit to operate the unit at Forced Cooling Operation Mode.
3. 3 Press the CHECK button on the remote control for about 1 second with a pointed object to transmit signal to
   main unit. A "beep" sound is heard, and the Error Code is cleared

104. (01101000) See Fault Code 106
106. (01101010) Display Module to Motor Control Module Communications Error
These faults are reported when the Display Module detects an error in the communications
between the Display Module and the Motor Control Module.
Primary Source: Display Module.
Action: Replace Display Module.
Secondary Source: Motor Control Module.
Action: Replace Motor Control Module.

Fixing temperature control startup error
Temperature of the Fixing Assembly did not reach the specified temperature within the specified period of time.
Remedy1. Check connectors on the fixing film unit. 2. Replace the fixing film unit. 3. Replace the engine controller PCB.

for more help visit CBR Tech Solutions

this fault code means there is a stuck key on the control board.you need to disassemble the display panel and free up the stuck key if this does not work then the display panel and or control board need to be replaced

F7 stuck keypad
Stuck keypad may mean relay is turned on.
Determine if problem is with the Key Panel or Control by:
1. Pushing CLEAR/OFF pad.
2. Disconnecting Ribbon Cable from control and waiting at least 32 seconds to see if Code recurs

If code recurs, problem is in the control. Replace control.

If code does not recur, problem is with the Key Panel.

1 Enter Standby
Press the [SRC] button.
Select the "STANDBY" display.
2 Enter Menu mode
Press the [MENU] button for at least 1 second.
When "MENU" is displayed, "SECURITY" is
displayed.
3 Enter Security Code mode
Press the Control knob for at least 1 second.
When "ENTER" is displayed, "CODE" is displayed.
4 Select the digits to enter
Push the Control knob to [4] or [¢].
5 Select the Security Code numbers
Push the Control knob to [FM] or [AM].
6 Repeat steps 4 and 5, and complete the
Security Code.
7 Confirm the Security Code
Press the Control knob for at least 3 seconds.
When "RE-ENTER" is displayed, "CODE" is
displayed.
8 Do the step 4 through 7 operation, and
reenter the Security Code.
"APPROVED" is displayed.
The Security Code function activat

Good Luck