Graco ProMix PD3K Plus Operation page 106

System Errors
Code Type Description
Code Code Type Type Description Description
QDA1 Differential
Pressure D
Over A
QDB1 Differential
Alarm
Pressure D
Over B
QDC1 Differential
Pressure D
Over C
QAD2 Differential
Pressure A
Over D
QBD2 Differential
Alarm Pressure B
Over D
QCD2 Differential
Pressure C
Over D
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Problem
Problem Problem
Differential pressure
is low between driving
component and second
component. This alarm
is active only during Mix
mode.
Differential pressure is
high between driving
component and second
component. This alarm
is active only during Mix
mode.
Cause
Cause Cause
There is a leak on the
second component side.
The second component
side pump is cavitating.
There is a leak on the
driving component side.
The driving component
side pump is cavitating.
Solution
Solution Solution
Check the system for
internal and external
leaks on all manifolds
and plumbing for the
second component.
Check paint supply on
the second component
side, increase paint
supply pressure.
Check the system for
internal and external
leaks on all manifolds
and plumbing for the
driving component.
Check paint supply on
the driving component
side, increase paint
supply pressure.
3A6287E