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Bit1: 1-Fault

Fault Word 7, Bit 1 — Comm failure( unit with driver)

York · Air-Cooled Chillers

What does Bit1: 1-Fault mean?

Communication has failed between the unit controller and the Variable Speed Drive (VSD).

Common Causes

  • Wiring issue between unit and VSD
  • VSD failure
  • Unit controller issue

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the communication wiring connecting the unit and the VSD.

  2. 2

    Ensure the VSD is powered and functioning.

  3. 3

    Restart both the unit controller and the VSD.

  4. 4

    Contact service for further diagnosis.

Browse all codes in this manual (23)
Verified technical data. Last updated: April 2026

Related Faults

1b Bit15: 1-FaultFault Word 2, Bit 15 — Ckt1 LPT fault2b Bit15: 1-FaultFault Word 2, Bit 15 — Ckt2 LPT fault3b Bit15: 1-FaultFault Word 2, Bit 15 — Ckt1 HPT fault
Source: York Air-Cooled Chillers
Open Manual (Page 135)Search more codes in this manual