What is 4 (or 2)? Should be #define or enum or const.

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Siemens. Space after and before paranthesis.

Add previousHeaterState to input and output

add prevDryBicartState to input and output.

Add prevBalChamberState to input and output

Add isBalChamberSwitchingActive to input

Align it with declration.

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Same as above.

Add an event here, when time out happens. Event data should capture fresh side and spent side fill completion status.

You may need to comment/ remove this condition. the pressure stabilized flag should set only when pressure is met (not on chamber fill request)

it shouldn't be the default value

Space after if.

Can we bring depressurize as well one of the states like fill, supply and drain? And the same way when one of the operations initiated and other should not kick in.

remove empty space after d66pressure variable. or match the indent to previous statement.

Add a TODO comment (remove later): this should be handled in IO/FP module.

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Depressurize?

Fix the typo.