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36 RT-SVD03L-EN
RTRM J6
SERVICE
SYSTEM
COOL
HEAT
COMMON
DC
VOLTS
Heat LED
Mo
Flame flashing indicates
active heating mode
E1 flashing indicates a
“Heat Failure” diagnostic
HEAT FAIL and COOL FAIL at the Same
Time, RTRM-J6-7 & 8 Pulsing Voltage
What the Readings Mean
• Coil temperature sensor is open or shorted (heat
pump only).
• Unit has failed to defrost properly (see heat pump
section for further details).
• Outdoor air sensor is open or shorted (RTRM
version 4.0 or greater).
• Dehumidification unit - RTOM disconnected or not
communicating. RTOM will flash once every few
seconds.
• Emergency stop input is open.
• Factory installed phase monitor is indicating a fault.
• Frostat ™ input active.
• Smoke detector active.
• Entering evaporator temperature failure (on
modulating reheat units).
• RTDM communication failure (on modulating
reheat units.
Mo
Alterning E1 and E2
flashing indicates a
“Heat Failure and Cool”
Failure diagnostic
Cool LED
Heat LED
Part Number - SEN01522
Compressor Will not Run, no Diagnostics
• Frostat ™ trip (RTRM v8.0 and later will exhibit
diagnostics as described above).
• Compressor disable input open.
• Unit is economizing, and outside air damper is not
yet at 100%.
• Unit is in “ “h he ea att” ” mode or “ “o offff” ” mode.
• Tracer ® or building management system is
preventing compressor operation (demand limit).
Supply Fan OFF, no Diagnostic
COOL
AM
Mo
Part Number - SEN01522
Unit is in “ “O OF FF F” ” mode locally or through TCI/LCI
Heat Pump - Compressors Will not Run
• Unit is in the “ “E EM ME ER RG GE EN NC CY Y H HE EA AT T” ” mode.
• If the compressor disable circuit or CC1, CC2
circuits create a lockout during “
“h he ea attiin ng g” ” mode, a
COOL FAIL (pulsing) indication will occur, not a
HEAT FAIL (pulsing) indication. See COOL
indications for details.
27.5 to 50 Tons Unit Additional
Diagnostics (VAV only)
If only one diagnostic is present, refer to that
diagnostic. If more than one diagnostic is present, refer
to combination diagnostics such as COOL + HEAT as
appropriate. On a BAYSENS020*, the display will show
HEAT FAIL or COOL FAIL or SERVICE (or an appropriate
combination) if a diagnostic is present.
HEAT (YC Only)
• TCO1, TCO2, or TCO3 has opened.
• IGN module lockout (see gas heat section for
troubleshooting).
• Supply air temperature sensor has failed if
configured for modulating heat.
COOL
• Discharge air sensor (DTS) is open, shorted, or has
failed.
• Zone temp input (RTRM J6-1) is open, shorted, or
failed during an unoccupied mode. If the unit has a
default mode input (jumper from RTRM J6-2 to
RTRM J6-4, a valid zone temp input is needed for
unoccupied heating, MWU and DWU.
• CC1 or CC2 24 VAC control circuit has opened three
times during a “
“cco oo olliin ng g” ” mode. Check CC1, CC2
coils or any control in series with the coils (winding
thermostat, HPC, circuit breaker auxiliary contacts).
R Re elliia aT Te ell ™ ™ R Re effrriig ge erra attiio on n M Mo od du ulle e ((R RT TR RM M))