How do I switch the temperature back to farenheit from celcius on the comfort zone heater?

The E1 error code on a Comfort Zone CZ220 heater indicates a problem with the high-temperature limit switch. This switch is a safety feature that shuts off the heater if it overheats.
To clear the error code, you can try resetting the heater by unplugging it from the power outlet and waiting for at least 30 seconds before plugging it back in. If the error code persists, it may indicate a more serious issue with the heater that requires professional repair.

Have you Googled it? Some examples on YouTube

On the Luxpro PSD111, Farenheit or Celcius are selected using the Jumper Switch J2 on the rear of the unit's circuit board:
Open = Celcius
Closed = Farenheit

Hold the Alarm 2 button down to change from Celsius to Fahrenheit.

Hello,
To switch it to Farenheit..press and hold the BROIL button for up to ten seconds and the display of the broil temp will change from 500 to F then push clear/off button...if later on it needs to be switched back to C do the same thing


GENE

Hold Down adn Enter keys for 3 seconds. Had the same problem, found the answer on this web site.

To change your heater display from Celsius to Fahrenheit: press and hold the "down" button and the "enter" buttons simultaneously for 5 seconds and release.
- VS

To switch between C and F, hold DOWN and ENTER for three seconds.
( I sell these. )

Hello all , just push and hold the two buttons on the right for 3 seconds and it will reset. Joe

TEMPERATURE - CELSIUS OR FARENHEIT
If you want to change the temperature indication from Celsius (C) to Farenheit (F), proceed as follows:
Turn the main switch, off and turn it on again. Press the Enter button five times, then press the P2 button five times. These ten times must be completed within fifteen seconds. Within three seconds after pressing P2 the last time, use the < > buttons to select temperature indication.