As seen here: EmonTH 2 not connecting, we have had a bad batch of emonTH units. It is a power supply issue between the battery and the board - with a programmer the board works fine. Tell-tale sign is that all these boards happen be be green in colour. Will only affect people who have ordered in late December or this year. Please direct anyone affected to email the shop ([email protected]) or PM me. Thanks!
Update: not all green PCB emonTH’s are affected only a few units from the batch.