Fujitsu FO20R Series Installation Instructions Manual page 52

Variable speed r-410a heat pump outdoor units
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9.0 DIAGNOSTICS & TROUBLESHOOTING
9.5 Active Protection Fault Details
L8 – Compressor Model Unknown – A900_O
Inverter Identity Fault
If the inverter compressor model is not set, the
inverter will keep the compressor from operation.
The VSODC will lock out the compressor to keep
it from operating and flash an "L" on the dual
7-segment LEDs followed by a 8.
IMPORTANT:
protection must be manually reset
Active Protection – Code
L8 – Compressor Model
Unknown – A900_O
Inverter Identity Fault
15 – Compressor Overcurrent – T901_O Inverter
Fault
If the inverter detects an output overcurrent
condition to the compressor greater than the
compressor/inverter envelope permits, the inverter
will automatically begin to slow the compressor
operation and reduce the output current. When
operating with an ECM outdoor fan motor and in
cooling mode the VSODC will increase the outdoor
fan speed. When operating in communicating
and heating modes the VSODC will request the
indoor airflow to be increased to the maximum
level permissible for the outdoor unit. If this fold
back is not successful in bringing the compressor
back into the designed operating envelope then the
compressor will be kept from operating.
During either of the above conditions where the
compressor has been stopped from operating the
VSODC will flash a "15" on the dual 7-segment
LED.
L15 – Power Factor Correction Circuit
Overcurrent – T903_O Inverter Fault
If the inverter detects an overcurrent condition in
the power factor correction circuit the inverter will
automatically shut the compressor off and keep
it from operation. There is a 5 minute delay after
this fault occurs before VSODC will restart the
compressor. If this fault occurs 3 times during
a single 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.
52
This mode of active
IMPORTANT:
protection must be manually reset
L15 – DC Bus Over Voltage – A904_O Inverter
Fault
If the inverter detects an overvoltage condition in
the DC bus circuit the inverter will automatically
shut the compressor off and keep it from operation.
The VSODC will leave the compressor off until the
DC bus voltage drops below 380Vdc. At this time
the VSODC will restart the compressor. If this fault
occurs 3 times in one hour the VSODC will lock
out the compressor to keep it from continuing to
operate for one hour and flash an "L" on the dual
7-segment LEDs followed by a 15.
IMPORTANT:
protection must be manually reset.
L15 – DC Bus Under Voltage – A905_O Inverter
Fault
If the inverter detects an under voltage condition
in the DC bus circuit the inverter will automatically
shut the compressor off and keep it from operation.
The VSODC will leave the compressor off until the
DC bus voltage rises above 300Vdc. At this time
the VSODC will restart the compressor. If this fault
occurs 3 times in one hour the VSODC will lock
out the compressor to keep it from continuing to
operate for one hour and flash an "L" on the dual
7-segment LEDs followed by a 15.
IMPORTANT:
protection must be manually reset.
This mode of active
This mode of active
This mode of active

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