HVAC Sales Master

Fault Code Lookup

HVAC Sales Master
12
Indoor Unit Not Detected
This code typically points to
  • Missing indoor unit
  • R/i+/i-/C wiring issue
  • Indoor control unresponsive
Next checks to confirm
  1. Check for voltage and missing component
  2. Check R, i+, i-, C at mag-mount/subbase, smart hub, and all attached devices
  3. Ohm conductors
  4. Cycle power to indoor unit first, then thermostat
  5. Verify EIM configured as furnace or air handler if used with non-communicating indoor unit
  6. Replace indoor unit control if no response
Escalation
Service urgent
Reset behavior
Automatically clears when issue no longer exists.
Urgent
Fix now
Need deeper detail?
Retrieve the subcode for this platform:
  1. On thermostat: Menu > Settings > Advanced Settings > Dealer Control Center > Notifications
  2. Review active alarms on homeowner notification screen or in Dealer Control Center > Notifications
  3. For service-app access, press the smart hub commissioning button once
  4. Connect the mobile device to the smart hub when the LED begins blinking green
  5. Use the app as a service tool after system commissioning is already complete (S30 service session auto-logs out after 30 minutes)
Tool required: iComfort Mobile Setup application for service workflow
Source
Residential Communicating Systems Alert Code Guide, p.8
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