5
Troubleshooting Guide - Advance Split Ducted Unit
Doc. 9590-2015-03 Ver. 3 221111
Troubleshooting Guide
Advance Split Ducted Unit
Fault
Sequence of Events
Possible Causes
Remedies
4. Low airflow during
AUTO Mode.
System produces reduced
airflow on Auto mode when all
or minimum zones are on.
System capacity has been
designed to heat/cool only
selected areas of the conditions
space at any one time.
Operate indoor fan on Low/ Med/High
speed to achieve more airflow.
Excessive static in ductwork.
Reduce static where possible.
Review duct design with reference to
Installation and Commissioning
Guide-Indoor.
5. Indoor fan not changing
speeds when in Auto
Mode
When zones are switched on
or off, airflow to active zones
doesn’t increase or decrease.
There is excessive static within
the duct design of the active
zones.
Review duct design with reference to
Installation and Commissioning
Guide-Indoor.
The indoor PCB is not changing
the fan PWM to adjust the fan
PWM to adjust the fan speed.
Check the output PWM from indoor PCB.
An increase in fan speed should result in
a increase in the fan % PWM (duty cycle).
Refer to table below test points expected
voltages.
To determine if the system may be
suffering from excessive or insufficient
static, check PWM & RPM values through
the indoor unit dashboard on the Master
Wall Controller:
• If the RPM is at its maximum value, and
the PWM has not reached its requested
value, this indicates a high static.
(Please refer to RPM Limits in Section
0.3)
• When switching off zones, and there
is little or no change in the RPM value,
this indicates insufficient static within
remaining active zones duct work.
6. HiS is displayed on the
wall controller after
a Self-Learn has been
preformed (L Series
Controller only).
System produces low airflow
when AUTO mode is selected
regardless of how many zones
are open.
HiS
is displayed on the wall
control as a indication of very
high static in the connected
return and supply duct which
can further effect the supply
air quantity during the auto
mode. If there is too much
static during self-learn, then
the controller will automatically
decrease the indoor fan speed
until an acceptable static is
achieved and the self-learn can
be completed with reduced
airflow.
Reduce static where possible. Review
duct design with reference to Installation
and Commissioning Guide - Indoor .
Once static has been reduced perform
Self-Learn again.
