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Copyright. SAI HVAC 2021
TM_VRAF_VAV12.19.001
6. Troubleshooting
Problem
Possible Solution
Air Conditioner has restarted but does not operate
for 4 minutes
The normal operating behaviour to protect the
compressor. Wait until the air conditioner begins
operating.
Operation stops for up to 12 minutes during heating
and a different noise/sound comes from the unit.
The unit has entered defrost mode to melt the frost
which has accumulated on the outdoor unit. This
will take no longer than about 12 minutes so wait
for the unit to resume normal operation. (Frost
accumulates on the outdoor unit when the outdoor
temperature is low and the humidity is high. Water
comes out from the outdoor unit).
The air conditioner does not operate.
Has the mode been set correctly?
Is at least one zone ON.
Has the setpoint for ON zones been set low enough
for cooling or high enough for heating?
Has the circuit breaker been tripped?
The air conditioner does not cool/heat effectively.
Has the mode been set correctly?
Are all the windows and doors closed?
Are the filters dirty?
Are the intake or outlet vents of the outdoor unit
obstructed?
The outside temperature maybe below or above
design conditions. Turning OFF any zones not
required may help.
Abnormal noise is heard during operation (except
during the defrosting operation).
Water leaks from the indoor unit.
Switches or buttons do not operate properly.
Fault code is displayed on the controller.
Contact your installer. Your model and serial
number is recorded on the inside of the last page of
this booklet.
