Hitachi Fault Code
Free · no signupW:1502
Pump Noise/Surge.
System
Not specified
Symptom
Pump Noise/Surge.
Diagnosis & fix steps
LOGIC: Primary Pump (P1) Pressure sensor voltage abnormal.
ACTION: Swap P1 and P2 sensors to see if the code moves. Check 5V reference.
Red Seal field insights
Hitachi use "paired" pumps. If the sensors don't "agree" within a certain PSI, the MC goes into safety mode. Swapping sensors is the fastest way to find a "liar."
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