26 RT-SVD03G-EN
ReliaTel Refrigeration Module (RTRM)
RTRM Diagnostics
Note: For production, several versions of the RTRM are used depending on unit functions. There
is one replacement module for all units.
RTRM System LED Diagnostic Indicator
On RTRM version 4.0 or higher, the green system LED on the RTRM module can provide a quick
visual indication of the presence of certain diagnostics. If the green LED on the RTRM is blinking
with two ¼ second blinks every two seconds, one or more of the following diagnostics is present:
3-50 Ton Units
Supply fan fail
Zone temperature sensor input failure on CV units
Programmable ZSM communication failure
Manual compressor lockout (one or both circuits)
Outdoor coil temp sensor failure (heat pumps only)
Defrost fault condition (heat pumps only)
Gas heat failure
Discharge Air Temperature Failure on Modulating Heat and Modulating Reheat units
Figure 17. ReliaTel Refrigeration Module (RTRM) - Board Connections
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