1 Kings 15:3; 1 Kings 15:5; 1 Kings 15:11
He continued to sin just like his father before him. He was not truehearted to God as his grandfather David had been.
For David had lived an exemplary life before God all his days, not going off on his own in willful defiance of God's clear directions (except for that time with Uriah the Hittite).
Asa conducted himself well before God, reviving the ways of his ancestor David.