Why a Weather-Matic Sprinkler System Blows Fuses

A Weather-Matic controller blows fuses. Two common culprits:

Shorting solenoid – one valve’s coil draws excess current. Test by activating zones one at a time; the zone that blows the fuse has the bad solenoid. Replace that solenoid.
Damaged field wiring – if every zone blows the fuse, the common or zone wires likely have a short (nicked insulation, rodent damage). Inspect and repair or replace the wire run.

Solenoids rarely all fail simultaneously, so a wiring fault is probable if all zones trip the fuse.

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