It appears F1 at the beginning of the preheated one of the furnace

Clean the flame sensor and check the gas pressure/mixture ratio.

Try cleaning the flame sencor

F1 touch pad / ERC test This simple test will help determine whether the ERC (Electronic Range Control or Clock) or the touch pad is defective when F1 error code is present.

Note: Some models incorporate the touch pad in to the ERC as a single assembly, in which case this test is not necessary. Simply replace the ERC (Clock).

Warning: If you feel in any way uncomfortable performing this test or making this repair, please contact a qualified appliance repair technician.

1. Disconnect power to the range (unplug the range power cord or turn the power off to the range at the circuit breaker). It is very important that the power to the range has been disconnected, so please double check before continuing.
2. Gain access inside the control panel.
3. Disconnect the touch pad (also called keypad or membrane switch) ribbon from the ERC.
4. Make sure there are no lose wires, or anything else that may cause a short when power is turned back on. Assemble the control panel back the way it was.
5. Turn the power back on.
6. Wait for at least one hour to see if the F1 code comes back (usually accompanied by a beeping sound).
7. If F1 comes back, replace the ERC. If it does not, replace the touch pad

Hello & Welcome to FixYa

F1 error means open/shorted oven temperature sensor or control board and to solve this problem the sensor needs replacement. If you want to do it yourself and wan to be sure before replacing the sensor then you can test it with a voltmeter between 1080-1120ohms....if it reads more then or less then this then it needs replacement however, if the reading is around between 1080-1120ohms then it is the control board that needs replacement. Please get back to me if you have any other questions.

Kevin

Hello & Welcome to FixYa

Error code F1 is displayed due to electronic oven control failure and the only way to solve this problem is by replacing the control board which is bad. Sorry for the bad news but hope you understand... Please get back to me if you have any other questions.

Kevin

Unfortunately F1 code means you have to replace the clock.

possible thermostat is sticking

F1 is an indication of a faulty control board, you can try unplugging for a bit, relpacing control if htat doesnt rectify, the parts not repairable, only replacable

37,008.4x - PEST_FAULT_PREHEAT_HEATER_DISCONNECT
PEST - Preheat Heater Disconnect The Preheat heater is not drawing the expected
power from the supply.
1. Run the Preheat Heater test.
2. Check the preheater wiring.
3. If the test fails, replace the preheater.

Your touch pad or control board is bad.
To determine what is bad, disconnect the ribbon strip to the board.
If you receive a code replace the board.
If no code appears, replace the touch pad.