Daikin MicroTech III DPS Installation And Maintenance Manual page 43

Alarms
4 Way Valve Problem - (4WayValve: Problem)
This alarm occures only on heat pump units when any of
the following conditions are true . When compressor heating
state is normal yet the DFT-Teg > 10°F for 15 minutes . When
compressor cooling state is normal yet the DFT-Teg < or equal
to 15°F for 15 mintues . When cooling or heating state is
normal, defrost cycle is inactive, and 4 way valve flag is false
for 15 minutes . Or when compressor state transisitons from
alternate initialization to normal and 4 way valve flag is false.
When this alarm is active compressor cooling and heating
operaiton is disabled .
The alarm must be manually cleared once corrective action is
taken .
Protection Interlock Problem - (Protection
Interlock Problem)
This alarm occures when the following are true for 90 seconds:
system mode is remote, inverter compressor start/stop
command is on, and compressor interlock is off.
When this alarm is active compressor cooling and heating
operation is disabled .
The alarm must be manually cleared once corrective action is
taken .
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