Main power has been
lost.
Check if the main power
is OK.
The current to the fan is
higher than normal.
Check if the switch, relay
or built-in fan protection is
disconnected.
Close the switch, and check.
If the fan is defective, replace
it.
Check if the connection
to the corresponding
input terminal (ID6) is ok
or if the controller board
is defective.
Check if the connection is
ok.
Reconnect the cable.
If the controller board is
defective, replace it.
Alarm is reset
automatically.
The alarm is a
warning to the
replace the filter.
Check if the filter is dirty.
Clean or replace the filter
Check if the connection
to the corresponding
input terminal (ID5) is ok
or if the controller board
is defective.
Check if the connection is
ok.
Reconnect the cable.
If the controller board is
defective, replace it.
The value set for the air
pressure diff. switch is
too low.
Check the air pressure
diff switch value.
Correct the value of the
switch to standard value.
Each unit continues
to work separately. It
can be reset
automatically.
The pLAN cable is
disconnected.
Check if the cable is
connected or shorted.
The clock function is
not available. Both
time display function
and history alarm
record function are
disabled.
It can be reset
automatically.
Fix the clock card on the
controller board
After the clock card is fixed,
check if the alarm is
removed.
The clock card has
failed.
After fixing the clock card,
the alarm still exists.
The free cooling
damper will be
closed. It can be
reset automatically.
Humidity sensor (port
J2-B3 on unit 1
controller) failure.
Check if the cable is
connected or shorted.
The humidity is higher
than standard value.
Dry the sensor, and then
check if the alarm is
cleared.
Indoor temp.
sensor
defective
It can be reset
automatically.
Indoor temperature
sensor (port J2-B2 on
unit1 controller) failure.
Check if the cable is
connected or shorted.
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