New Holland Boomer 47 Operator's Manual page 63

Fault code
AB14
AB15
NOTE: Contact your authorized NEW HOLLAND dealer
for fault code analysis.
3 - CONTROLS AND INSTRUMENTS
Possible cause
(DPF) differential Normal sensor signal
0.25 to 4.75 volts
pressure sensor (9)
Connector
connection
Wiring harness for
open or shorted
circuit
Battery Normal battery
Positive (+) battery voltage 6 to 29 volts
cable (Instant)
Negative (-) battery Connector
cable connection
Wiring harness for
open or shorted
circuit
Check
3-9
Location
9
NHIL14CT00060AC