Viesa AGRO Installation Manual page 39

The restriction valve is not clogged and that water flows freely
trough the outlet.
The water pump supply voltage is correct: 9.8 V minimum.
Important: Measure at the pump's connector with the pump
working and the turbo blower at maximum speed.
The water pump consumption (Amp) is between the specified
values: between 3.7A and 6.0A (with water running through).
Important: Remove the fuse and measure at the fuse box while
the pump is running and the biturbo blower is off.
The water pump electrical connections are correct.
OUTLET
CLOGGED
(NO RESTRICTION)
YES
RED (+)
BLACK (-)
RED (+)
BLACK (-)
NO
RED (+)
BLACK (-)
BLACK (-)
RED (+)