What this code means

This alarm occurs when both the travel demands (Fwd and Bwd) are active at the same time.

Applies to: ZAPI ACE0 / COMBIAC0 controller.

Possible causes / checks (from the source)

Check the wiring of the Fwd and Rev travel demand inputs (use the readings in the TESTER to facilitate the troubleshooting). Check the microswitches for failures. A failure in the logic is possible too. So, when you have verified the travel demand switches are fine working and the wiring is right, it is necessary to replace the controller.

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