Hunter Pro-C OP ERR / IC ERR: Reset & Check Master Valve/Pump Circuit

OP ERR / IC ERR on Hunter Pro-C typically means short in Master Valve (MV) or Pump Start (PS) circuit — or a valve short if no MV/PS wired.

Reset First

1. Hold PRG button.
2. Press reset button (back of display board, hinge out to access).
3. Release PRG.

Then Isolate

• Wire on P/MV terminal? Disconnect it. Run zone manually. If error clears → fault in MV/PS wire, solenoid, or relay.
• No wire on P/MV? Test each zone manually — error on specific zone = that valve/solenoid shorted.

Fix

Repair shorted wire or replace faulty solenoid.