Hardie Controller Shows "4 FUS": Replace Valve 4 Solenoid

"4 FUS" on Hardie display = internal breaker tripped on valve 4 circuit. Not a replaceable fuse — it's a PTC that resets when short clears.

Fix

1. Identify wire color on terminal 4.
2. Find valve 4 in box.
3. Replace solenoid (~$8).

Resource

irrigationtutorials.com for solenoid replacement guide.