HVAC Sales Master

Fault Code Lookup

HVAC Sales Master
ERR104.02
All heater relay stuck open error / OPEN#
This code typically points to
  • Heater relay failure
  • Open element
  • Open non-cycling limit switch
Next checks to confirm
  1. Check relay, heater element, and non-cycling limit
Escalation
Critical
Reset behavior
Not separately stated.
Safety Critical
Immediate concern
Source
Trane Hyperion *AM8/TAM8 Field Reference Data, p.22
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