baisi boiler

Hi, I have Baisi boiler model Garda HE M96.24SM/B. Its not working properly for Hot water. Room Thermostat: Set to 22 degree. DHW control knob: Set to 5 Ch control knob: Set to 6 Hot water will come for few minutes (may be a bucket or two). During this time, 1st and 3rd lamp flashes...