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15004

15004 — Defrost thermistor fault, circuit B

Carrier · 30XA/XAS/XB/XBP/XW Chillers

What does 15004 mean?

The sensor monitoring the temperature for defrost on circuit B has failed. In cooling mode, an alert is displayed; in heating mode, circuit B shuts down.

Common Causes

  • Defective thermistor
  • Wiring issue with the defrost thermistor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the wiring to the defrost thermistor for circuit B.

  2. 2

    Look for any signs of damage on the thermistor.

  3. 3

    Reach out to Carrier Service if the issue is not resolved.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

1007810078 — High discharge gas temperature, circuit A1007910079 — High discharge gas temperature, circuit B1008010080 — High discharge gas temperature, circuit C
Source: Carrier 30XA/XAS/XB/XBP/XW Chillers
Open Manual (Page 37)Search more codes in this manual