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TABLE 5
INVERTER-RELATED ALARMS
ALARM CODE DISPLAY MESSAGE EVENT ACTION
187
INVERTER LOW LEVEL
ALARM
Possible alarming values for Prodigy Alarm 187 are:
12 - High compressor input current
13 - High heat sink temperature
14 - High PFC input current
Alarm might be caused by outdoor fan abnormal operation, high ambient conditions, dirty outdoor coil,
refrigerant overcharge, or a blocked heat sink.
The compressor speed will slow down until the temperature or current lowers, then the compressor will
speed up again.
If the alarm continues after outdoor conditions have moderated, check the fan, charge and coil. Alarm
187 will automatically clear when minimum off time expires.
REFER TO TROUBLE SHOOTING GUIDE IN SERVICE MANUAL FOR MORE INFORMATION.
188
INVERTER HIGH LEVEL
ALARM
Possible alarming values for Prodigy Alarm 188 are:
21 - Peak DC current - Intelligent Power Module (IPM) fault condition (follow 12)
22 - Maximum current reached lockout
23 - DC link low voltage
26 - Locked rotor
28 - DC link high voltage
29 - Compressor over-current
61 - Low outdoor ambient inverter lockout
62 - High heat sink temperature lockout
75 - Low input voltage
No action required. Compressor stops for the duration of the minimum run time (anti-short-cycle delay of
180 seconds). Unit shuts down after ten occurrences in one hour and Alarm 189 is initiated. Alarm 188
will automatically clear when inverter error clears.
REFER TO TROUBLE SHOOTING GUIDE IN SERVICE MANUAL FOR MORE INFORMATION.
189
INVERTER FATAL
ALARM
Possible alarming values for Prodigy Alarm 189 are the same as alarm 188.
Alarm 189 will clear upon manual reset.
REFER TO TROUBLE SHOOTING GUIDE IN SERVICE MANUAL FOR MORE INFORMATION.
190
INVERTER
COMMUNICATION
ERROR
Unable to communicate with inverter. Unit Controller will disable compressor operation. Replace
communication cable between inverter and M3 unit controller. If alarm continues, replace M3 unit
controller or inverter.
191
INVERTER VOLTAGE
MISMATCH
Unit Controller will disable compressor operation. Replace with correct inverter part.
a-Filter Board FL1
The filter, also called a line or noise filter, is used to prevent
static interference from outside sources. In addition, the fil
ter prevents electrical interference from transferring to oth
er appliances. The input voltage should read the same val
ue as the output voltage. The same filter is used on all unit
sizes and voltages.
b-Inverter Transformer T61
This transformer is used to supply power to the inverter's
low voltage logic circuit. It also provides electrical isolation
to protect sensitive components from electrical surges.
c-Reactor L43
The reactor (inductor or choke) is used to improve the pow
er factor. This passive, two-terminal electrical component
has a magnetic field that stores energy. Reactors are one of
the basic components used in electronics where current
and voltage change with time (due to the ability of inductors
to delay and reshape alternating currents). This component
is connected to the compressor inverter A192. A 2mH reac
tor is used on 208/230V units and a 13mH reactor is used
on 460V units.
d-Inverter Heat Sink
The A192 inverter heat sink is cooled by B47 fan located
behind the inverter mounting panel. The B47 fan can be ac
cessed as shown by opening the filter access panel. Relay
K191 provides power to the B47 fan through P417 Plug.
The fan is always energized while the B1 Compressor is
running. See figure 9.
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