This code is simply an information status display showing how your boiler's internal water pump is currently being told to operate, rather than an error or a fault with your heating system.

Technical description

Pump operating mode, 2 stage pump: 0=Burner mode stage 2, pump flow/overrun stage 1; 1=Heating mode and pump flow/overrun stage 1, hot water handling mode stage 2; 2=Automatic heating mode, pump flow/overrun stage 1, hot water handling mode stage 2; 3=Stage 2