schematic datasheet

I have designed a battery charging circuit for a lithium ion battery.When i connect a battery the charging IC seems to do nothing. Only when i use a multimeter probe to measure the drop across VFB pin i.e R16 the IC starts to charge,voltage on this pin slowly climbs up to 3.3V like it should. without the meters measurement the IC does not charge the battery.All the components have been checked and is soldered properly. can someone explain what's goin on.