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What is the model on the control where you are getting the 22.01 code?
I am not familiar with that number. Tell me if thermostat looks like this and is this where you get the rrrror code?
Let me see if I have a manual on this. Meanwhile look on furnace control board and see if we are also getting a flash code there by number of blinks between pausing.A 22 error code usually implies flame was on, but signal was weak.Most likely cause is a dirty flame sensor. It can be cleaned using sand cloth or emery cloth.
I have a couple of manuals on the thermostat, but they do not list the error codes. I know normally 22 on an American Standard indicates low flame and on furnace is indicated by 8 flashes on the board, but not finding the codes for the thermostat you provided., I am going to open to other experts who may have this info readily available while I look.