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Fujitsu FO20R Series Installation Instructions Manual page 54

Variable speed r-410a heat pump outdoor units
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9.0 DIAGNOSTICS & TROUBLESHOOTING
9.5 Active Protection Fault Details (cont.)
automatically shut the compressor off and keep it
from operation. If this fault occurs 3 times during
one call for operation the VSODC will lock out the
compressor to keep it from continuing to operate
and flash an "L" on the dual 7-segment LEDs
followed by a 15.
IMPORTANT:
protection must be manually reset.
L15 – PFC & IGBT Temperature High – T918_O
Inverter Fault
If the inverter identifies a high insulated-gate
bipolar transistor (IGBT) temperature or power
factor correction (PFC) circuit temperature reading
the inverter will automatically shut the compressor
off and keep it from operation. If this fault occurs 3
times during one call for operation the VSODC will
lock out the compressor to keep it from continuing
to operate and flash an "L" on the dual 7-segment
LEDs followed by a 15.
IMPORTANT:
protection must be manually reset.
L15 – PIM Temperature Fold back – T922_O
Inverter Fault
If the inverter detects a high Power Module
temperature the inverter will automatically begin
to slow the compressor operation. If this fold back
is not successful in bringing the PIM temperature
into the acceptable range then the compressor
will be kept from operating. If this fault occurs 3
times during one call for operation VSODC will
lock out the compressor to keep it from continuing
to operate and flash an "L" on the dual 7-segment
LEDs followed by a 15.
IMPORTANT:
protection must be manually reset.
54
This mode of active
This mode of active
This mode of active
L16 – Microprocessor Fault – A912_O Inverter
Fault
If the inverter identifies a faulty microprocessor the
inverter will automatically shut the compressor off
and keep it from operation. The VSODC will lock
out the compressor to keep it from continuing to
operate and flash an "L" on the dual 7-segment
LEDs followed by a 16.
IMPORTANT:
protection must be manually reset.
L16 – PIM Temp Sensor Open – A913_O Inverter
Fault
If the inverter identifies an open power module
temperature thermistor the inverter will
automatically shut the compressor off and keep
it from operation. The VSODC will lock out the
compressor to keep it from continuing to operate
and flash an "L" on the dual 7-segment LEDs
followed by a 16.
IMPORTANT:
protection must be manually reset.
L16 – PFC MCU/DSP Communication Fault –
A919_O Inverter Fault
If the inverter identifies a communication fault
between the MCU (motor control unit) or DSP
(digital signal processor), the inverter will
automatically shut the compressor off and keep it
from operation. If this fault occurs 3 times during
one call for operation the VSODC will lock out the
compressor to keep it from continuing to operate
and flash an "L" on the dual 7-segment LEDs
followed by a 16.
This mode of active
This mode of active

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