Defect : Insufficient solder Process/machine infomation :  Board type - Double sided  Solderability protection - OSP  Flux carrier - Water  Preheat type - Forced Convection  Process solutions Conveyor speed too slow. a. Time over preheat too long causing flux to be burned off. b. Dwell time too long causing flux to be destroyed before exiting the wave. Topside board temp too high for flux, causing flux to burn off before board reaches waves. Flux not active enough or solids percentage too low. Not enough flux. Wave height too low on one or both waves.   Board and design solutions Board/component solderability. Component layout, orientation.