116
RTAA-IOM-3
Table 18
Diagnostics and Troubleshooting Chart (Continued)
DIAG. ACTIVE
CODE DIAGNOSTIC DESCRIPTION TYPE MODES CAUSE
1bE Winding Temp.- Compressor A CMR All a. The motor winding temperature
thermostat opened; nominally 221 F.
b. The motor temperature thermostat or
wiring is open.
c. Time to trip from input open to
compressor shutdown shall be 0.5 to
2.0 seconds.
1bF Winding Temp.- Compressor B CMR All Same as diagnostic 1bE.
1C0 Winding Temp.- Compressor C CMR All Same as diagnostic 1bE.
1C1 Winding Temp.- Compressor D CMR All Same as diagnostic 1bE.
1C2 Discharge Temp.- Compressor A CMR All a. The discharge temperature exceeded
the trip value of 275 F.
b. The discharge temperature PTC or
wiring is open.
Note: on units built in 1992 and later,
the discharge temp sensor will not be
present.
1C3 Discharge Temp. - Compressor B CMR All Same as diagnostic 1C2.
1C4 Discharge Temp. - Compressor C CMR All Same as diagnostic 1C2.
IC5 Discharge Temp. - Compressor D CMR All Same as diagnostic 1C2.
1C6 High Diff. Pressure - Circuit 1 CMR Compressor Energized a. The difference between the condenser
pressure and the evaporator pressure
exceeded 350 PSID for 0.8 to 5.0
seconds. 320 PSID must hold, 320+ to
trip for 1 hour.
1C7 High Diff. Pressure - Circuit 2 CMR Compressor Energized Same as diagnostic 1C6.
1d1 Memory Error Type II IFW All a. A Shadow RAM memory error was
detected. The UCM is operating on all
last valid values (pulled from
NOVRAM) for all setup parameters.
No setup parameter changes were
pending to be loaded into NOVRAM, a
complete recovery of all setup
parameters was made and there is no
need to check unit setup parameters.
Compressor starts and hours were lost
for not more than the last 24 hours.
This is expected to be an isolated
event and repair or replacement is not
required.
1d2 Memory Error Type III IFW All a. A Shadow RAM memory error was
detected. The UCM is operating on all
last valid values (pulled from
NOVRAM) for all setup parameters.
Setup parameter changes less than 24
hours old pending to be loaded into
NOVRAM were lost. Check all setup
parameters made in last 24 hours.
Compressor starts and hours were lost
for not more than 24 hours. This is
expected to be an isolated event and
repair or replacement is not required.
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