The red lock light is on and the clean lint filter display is on

Check to see if it is a child lock If so hold it in till it goes off. Also check the thermal cutoff on the heater.
ENTER & EXIT FIELD SERVICE MODE
From idle state, press and hold the “Signal” and “” buttons for 3 seconds. Lock
Upon entering the service mode, the Control shall be in test selection mode and display the test number first (t01).
Rotating the knob counter clockwise (CCW) shall decrement the test number in the display.
Rotating the knob clockwise (CW) shall increment the test numbers in the display.
Once the test number is selected, pressing “Start/Pause” shall begin the selected test.
During a test, pressing “Power” button shall terminate that test and bring the Control to the test selection mode (test number is displayed on the display).
Pressing “Power” key during the test selection mode shall exit the Service mode.
(E00 – All
E01 – Read/Write problem Reading or writing improperly. Verify EEPROM access
E02 – Inlet Thermistor Short Check and replace inlet thermistor if necessary
E03 – Outlet Thermistor Short Check and replace outlet thermistor if necessary
E04 – Inlet Thermistor Open Check and replace inlet thermistor if necessary
E05 – Outlet Thermistor Open Check and replace outlet thermistor if necessary
E06 – Different EEPROM Compare UI type stored in EEPROM and physical UI present
E07 – Stuck Button Verify if there is any button stuck Low
E60 – Door Switch Open Door switch must be close
E61 – Control Board Miswired L2 and N miswired (AC input too high)
E62 – Control Board Input AC line frequency detection error and low input voltage
E80 – Control Board invalid Invalid UImodel
E81 – Control Board invalid Invalid Power model
ERROR CODES
Error Codes
Programming