T29 (Tinyana) PNC - A Mixture of Forbidden and Permitted — A Sign of Damaged Yichud

When a halachic she'eilah arises in your house — a mixture of forbidden and permitted, with not enough heter to nullify the issur — that is Heaven showing you that you have damaged some yichud above. All yichudim and zivugim are the dynamic of nullifying issur. We say 've-asar lanu es ha-arusos ve-hitir lanu es ha-nesu'os' — the betrothed is forbidden, marriage turns issur into heter. Even the lower zivug in this world is described: 'Elokim moshiv yechidim baytah' (Tehillim 68:7), which Chazal (Sotah 2) read for zivugim, and then 'motzi asirim ba-kosharos' — the forbidden becomes kosher and permitted, the form of nullifying issur. So when the issur is not nullified and the question rules forbidden, it is a sign that some yichud above has been damaged, because yichud is the very form of nullifying issur.