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Hello, my name is Hank.
You can not clear the codes in the controller. The only way to clear them are to replace the controller, or when a new code over writes the old code.
If you are getting a code 27 even with the new controller, you have a problem in the generator or connections.
Lets start with the right model number - the one you gave is not correct.
I will need the full model number, exactly as it is written on the data label.