⚠️ Status: Obsolete
The Simplex 4005 is a legacy conventional panel. A full system upgrade to a modern addressable equivalent is highly recommended.
Common Simplex 4005 Trouble Codes
- ZONE OPEN: A field wire on an initiating device circuit has been disconnected or severed, preventing the panel from reading the end of line resistor.
- ZONE SHORT: A positive and negative wire are touching on an initiating circuit, which can trigger a false alarm or an isolated trouble condition.
- GROUND FAULT: A bare copper wire on a zone or notification circuit is physically touching the metal conduit or the panel motherboard enclosure.
- BATTERY TROUBLE: The sealed lead acid backup batteries have dropped below their required voltage or failed an automatic load test.
The Simplex 4005 is a severely outdated conventional fire panel, making replacement parts incredibly difficult to source. If your building is stuck with constant zone troubles or ground faults, our technicians can evaluate your wiring and provide a fast and compliant panel upgrade quote for your Austin facility.