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Troubleshooting Guide - Advance Split Ducted Unit
Doc. 9590-2015-03 Ver. 3 221111
Troubleshooting Guide
Advance Split Ducted Unit
Fault Code
Description
Possible Causes
Remedies
E42 and E45
Envelope
Protection Error
As the compressor starts, it will wait until
the compressor envelope control start delay
has expired. Once the delay has expired,
only then will the compressor start to track
the floating point which is defined by HP/LP
saturation temperature with respect to the
selected compressor envelope (the compressor
envelope has been divided in to the four parts
– Extreme low evaporating pressure, High
compression ratio, High condensing pressure,
Low compression ratio.
In the case of when the compressor operates
outside the envelope boundaries, there is an
allowable time of which the compressor may
continue to operate – these time restrictions
are tabulated below.
The compressor will turn off if the allowable
time-out expires. After 180 seconds, the UNO
controller will auto reset according to the
respective error code and start again to user
define mode.
System can trip on any of the four envelope
protection error code:
E42
: Unit will trip on this error code if
compressor is running outside the envelope
boundary on extremely low evaporating
pressure side for 20sec.
Same as E09
Same as E09
E43:
Unit will trip on this error code if
compressor is running outside the envelope
boundary on high compression ratio side for
3sec.
Insufficient airflow over
indoor coil during heating
operation
Check indoor fan operation
to ensure sufficient airflow
is flowing across the indoor
coil
Under or overcharged with
refrigerant
Amend gas charge until
charge is correct
E44:
Unit will trip on this error code if
compressor is running outside the envelope
boundary on high condensing pressure side for
3sec.
Same as E11
Same as E11
E45:
Unit will trip on this error code if
compressor is running outside the envelope
boundary on low compression ratio side for
90sec.
System may be running
outside the operating
limits.
Make sure system should
not be operated outside
the operating range.
Outdoor fan relay might be
stuck on the high speed.
Replace the outdoor
board.
E47 Compressor
Torque Limit
Error
Motor torque has exceeded its limits
Compressor running outside
the operating limits.
Airflow across the indoor or
outdoor coil is not proper.
Overcharged with
refrigerant.
Amend gas charge until
charge is correct
