AIRSYS 13E1C3 - Page 57

Page 53
Code
Signal
Description
Possible Cause
Component to Check
Recommended Action
Device Actions
Supply
Fan
Compressor/
Cond Fan
Heat
Damper
Check if the connection
to the corresponding
input terminal (ID1) 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.
A07
High
temperature
alarm
Alarm is reset
automatically.
Occurs when the
current indoor
temperature is
greater than the
indoor temperature
set point value plus
the temperature
alarm offset.
The default is 84.4˚ F
with 5 minutes delay.
The cooling capacity
loss or heat load is too
great.
Check for leakages in the
refrigerant circuit.
Check if heat load
exceeds the design
range.
Patch the leak.
Increase the cooling capacity.
Compressor circuit
failure
Check if components
connected to the
compressor are OK;
Check if the compressor
is OK.
Check if the electric
connection is OK.
Replace the defective
components.
Replace the compressor.
Reconnect the cables.
Indoor temperature
sensor (B1) failure.
Check if the sensor is
shorted or has failed.
Replace the indoor
temperature sensor.
Incorrect value set for
the high temperature
alarm.
Check if the value is
correct.
Correct the value.
A08
Low
temperature
alarm
Alarm can be reset
automatically.
Occurs when the
current indoor
temperature is less
than the indoor
temperature set point
value minus the
temperature alarm
offset.
The default is 59˚F
with 5 minutes delay.
Heating capacity loss.
Check if the heaters are
OK.
Check for leaks around
the unit.
If heaters have failed, replace
them.
Seal the leaks.
Indoor temperature
sensor (port B2) failure.
Check for a short in the
sensor or if it has failed.
Replace the indoor
temperature sensor
Incorrect value set for
the high temp alarm
Check if the value is
correct.
Correct the value.
A09
Prime power
outage
Alarm is reset
automatically
Primary power is or was
turned off.
Off
Off
Off
Closed
A10
A11
Supply fan
overload
The unit will stop
working. Alarm is
reset automatically.
The fan is blocked.
Check if the fan speed
and operating current are
normal.
Remove the blockage.
If the fan is defective, replace
it.
Off
Off
Off
Closed