MISWIRE
Briggs & Stratton · 30675 12,000 Watt 20 HP 120/240V Standby Generator with Automatic Transfer Switch Ready
The controller has detected a wiring error in the connection between the generator and the automatic transfer switch (ATS). This could indicate reversed phases, a missing neutral connection, or an incorrect utility/generator feed configuration. This fault prevents the generator from operating to avoid backfeeding utility lines (which is extremely dangerous to utility workers). This is an installation-related fault — contact the installing electrician or a B&S authorized dealer for correction. Do not attempt to clear and ignore this fault as it indicates a genuine wiring safety issue.
Error MISWIRE on the Briggs & Stratton 30675 12,000 Watt 20 HP 120/240V Standby Generator with Automatic Transfer Switch Ready means: Miswire — Transfer Switch Wiring Error. The top-ranked community fix is “Correct Transfer Switch Wiring and Test Phases” (hard difficulty, ~90 min, DIY cost: $0-$10). 2 community-ranked fixes available below.
Published February 2026 · 2 fixes · standby generator
Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.
While many standby generator repairs can be done safely at home, consider hiring a qualified technician if:
Average professional repair cost for this issue: $250-$400.
Charger Fault — Battery Charger Malfunction
Controller Fault — Internal Logic Error
High Temperature — Engine Overheating
Maintenance Due — Service Reminder
Low Battery — Starter Battery Voltage Low
Low Oil Pressure — Engine Protection Shutdown
Weekly Exercise Failure
Fuel System Problems
The Briggs & Stratton 30675 12,000 Watt 20 HP 120/240V Standby Generator with Automatic Transfer Switch Ready has 8 other known error codes:
Error code MISWIRE also appears on 2 other Briggs & Stratton models:
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