How would the feedback mechanism function to restore homeostasis after low thyroid stimulating hormone?

High levels of TSH initially increases the level of thyroid hormone (TH). When the TH levels get high, the feedback mechanism starts to work: The excess amount of TH in the blood signals the pituitary gland to decrease secretion of TSH, which decreases the amount of TSH that is secreted by the pituitary gland, and maintains homeostatis.