Error code F61 mean-faulty amlifier output IC or fan motor.
And check all resistors around output IC.
I just have service sheet for SAHT220
[file=../../e107_files/public/1164052371_1_FT28_error_codes.rar]1164052371_1_FT28_error_codes.rar[/file]
[file=../../e107_files/public/1164052371_1_FT28_saht220.rar]1164052371_1_FT28_saht220.rar[/file]