While starting fermentation by holding the "-" button there is no definite indication of it. So it hard to distinguish the moment of starting fermentation process.
Supposing that displaying of countdown timer will be sufficient.

In the root menu hold button '+' for 3 seconds to enable/disable thermostat.
When thermostat is disabled only measurement of temperature is done.

Hold the '-' button for 3 seconds to start fermentation timer. During this mode thermostat is enabled.
When fermentation timer is running hold '-' button for 3 seconds to reset fermentation timer and stop countdown.

Converting the project to the sduino using the Arduino IDE.

Raw ADC values seem not to be compatible with existing rawAdc table, suspect variant board with R2 =5K.

Need spreadsheet to calculate rawAdc table with other R2 values.

Display code finished. Arduino polling and timer code finished, ADC code finished. Need to figure out the conversion table and port the rest. Great code, many thanks.

The fermentation time have to be in the quick change menu instead of temperature threshold value.
The setting of hours and minutes of fermentation time have to be done separately.

Because there is no beeper on the board let's try to use the relay as the beeper.

severity is low
description:
the menu switches into parameter selection mode with parameter index = 9 which is forbidden for direct access and should not be available for selection.
use case:
at root menu press shortly button "set".
-> value for fermentation timer will be shown (blinking).
immediately press and hold "set" button for long time (about 5-10 seconds).
-> P9 parameter index will be shown.

Implementation of
@brief Constructs string that represents current uptime using given format.
@param strBuff
A pointer to a string buffer where the result should be placed.
@param format
Day - D | d, Hour - H | h, Minute - M | m, Second - S | s.
In place of capital letter the actual value will be shown even if this value is zero. The small letter will be replaced by actual value only if this value is non-zero.
Due to the limited display size, only the "." character is allowed as a separator.
Example: "dd.hH.MM" for 00 days, 10 hours and 02 minutes will produce ".10.02" result.