err 01-error in difference pressure-check l10,replace ANA PCB
err 03-initializing error-replace cpu pcb
err 04-flow sensor drift-check flow sensor separator and replace if necessary
err 20-automatic relief system blockage-check automatic relief system and replace if necessary
err 21-fluid sensor error-check and clean fluid sensor and all tube
replace if necessary
err01/02-eprom error-replace cpu pcb
err 15-temp. difference bet. service menu L02 and l03 is too small-let divice cool for 30min. L02 repeat,L03 repeat but cover the device andplace it in a draft-free area
Note: In my experience,i replaced i.c. 93lc56b of cpu pcb and re- set all error code,I don't exprience, to have a back repair after resetting all error code.
_________________________
Engineering