Fault Code Lookup

HVAC Sales Master

ERR104.00

Heater relay fault / EH RLY

This code typically points to

Heater relay failure

Next checks to confirm

Test heater relay operation

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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