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Fujitsu FO20R Series Installation Instructions Manual page 57

Variable speed r-410a heat pump outdoor units
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9.5 Active Protection Fault Details (cont.)
increases to 187VAC. At this time the VSODC
will restart the compressor. While the compressor
is off the VSODC will display a 27 on the dual
7-segment LEDs.
IMPORTANT:
protection is automatically reset.
28 – AC Input Over Voltage – A906_O Inverter
Fault
If the inverter detects input AC over voltage the
VSODC will automatically shut the compressor
off and keep it from operation. The VSODC will
leave the compressor off until the input AC voltage
reduces to 252VAC. At this time the VSODC
will restart the compressor. While the compressor
is off the VSODC will display a 28 on the dual
7-segment LEDs.
IMPORTANT:
protection is automatically reset.
L29 – High Refrigerant Pressure – A/T 923_O
High Refrigerant Pressure
• If the HPC opens three (3) times during the same
call for unit operation, the VSODC will lock out
the compressor to keep it from continuing to
operate and flash a "29" on the dual 7-segment
LEDs followed by an "L."
IMPORTANT:
protection must be manually reset.
31 – Compressor Envelope Protection- T902_O
Inverter Fault – Envelope Protection
If the inverter detects the calculated compressor
torque is greater than the designed operating
envelope permits the inverter will automatically
begin to slow the compressor operation. 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.
9.0 DIAGNOSTICS & TROUBLESHOOTING
This mode of active
This mode of active
This mode of active
IMPORTANT:
startup and shutdown for the compressor to
venture outside the designed operating envelope. It
is possible this fault can be seen on an installation
when there is nothing wrong with the installation.
For this reason the VSODC will auto reset and
return the system to operational condition after the
compressor delay is complete.
Prior to restarting the compressor the VSODC
7-segment display will flash a "31".
35 – Suction Temperature Thermistor Failure –
A102_O
If the VSODC identifies an issue with Outdoor
Suction Thermistor (OST) sensor the VSODC will
flash a 35 on the dual 7-segment LEDs.
IMPORTANT:
protection is automatically reset once the OAT
sensor failure is corrected.
36 – Suction Pressure Sensor Failure – A956_O
If the VSODC identifies an issue with the Suction
Pressure Transducer (SPT) sensor the VSODC will
flash a 36 on the dual 7-segment LEDs.
IMPORTANT:
protection is automatically reset once the OAT
sensor failure is corrected.
It is common during
This mode of active
This mode of active
57

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