Trane ReliaTel Diagnostic Manual page 31

What the readings mean
Heating-RTRM-J6-7.
ON – System is actively heating.
OFF – System is not actively heating.
PULSING – See below:
Gas heat
If any failure occurs such as loss of flame, limit switch trip, flame rollout etc, this indication is
present. Further diagnostics are available by examining the Ignition Module LED. See the gas heat
section for detail.
Electric heat
These units have safety limit switches in the electric heat control circuit. Should a limit switch trip,
no diagnostic will occur. the HEAT indication will stay ON.
Heat pump
Unit is in the EMERGENCY HEAT mode.
If the Compressor Disable circuit or CC1, CC2 circuits create a lockout during heating mode, a COOL
FAIL (pulsing) indication will occur, not a HEAT FAIL (pulsing) indication. See COOL indications for
details.
Any unit
Supply Air Temperature Sensor Failure and Unit is CV with Modulating Heat or Modulating Reheat.
RT-SVD03G-EN
Heat LED
Flame flashing indicates
active heating mode
Mo
E1 flashing indicates a
"Heat Failure" diagnostic
ReliaTel Refrigeration Module (RTRM)
Heat Diagnostic
31