Multi-Zone Outdoor Condenser Owners Manual
DURASTAR.COM10
ISSUE POSSIBLE CAUSES
Unit does not turn on 
when pressing ON/OFF 
button
The unit has a 3-minute protection feature that prevents the unit from 
overloading. The unit cannot be restarted within three minutes of 
being turned off.
The unit changes from 
COOL/HEAT mode to 
FAN mode
The unit may change its setting to prevent frost from forming on the 
unit. Once the temperature increases, the unit will start operating in 
the previously selected mode again.
The set temperature has been reached, at which point the unit 
turns off the compressor. The unit will continue operating when the 
temperature fluctuates again.
Both the indoor and 
outdoor units emit 
white mist
When the unit restarts in HEAT mode after defrosting, white mist may 
be emitted due to moisture generated during the defrosting process.
Both the indoor unit 
and outdoor unit make 
noises
Low hissing sound during operation: This is normal and is caused by 
refrigerant gas flowing through both indoor and outdoor units.
Low hissing sound when the system starts, has just stopped running, 
or is defrosting: This noise is normal and is caused by the refrigerant 
gas stopping or changing direction.
Squeaking sound: Normal expansion and contraction of plastic and 
metal parts caused by temperature changes during operation can 
cause squeaking noises.
The outdoor unit 
makes noises
The unit will make different sounds based on its current operating 
mode.
Dust is emitted from 
either the indoor or 
outdoor unit
The unit may accumulate dust during extended periods of non-use, 
which will be emitted when the unit is turned on. This can be mitigated 
by covering the unit during long periods of inactivity.
The unit emits a bad 
odor
The unit may absorb odors from the environment (such as furniture, 
cooking, cigarettes, etc.) which will be emitted during operations.
The unit’s filters have become moldy and should be cleaned.
The fan of the outdoor 
unit does not operate
During operation, the fan speed is controlled to optimize product 
operation.
Operation is erratic, 
unpredictable, or unit is 
unresponsive
Interference from cell phone towers and remote boosters may cause 
the unit to malfunction. In this case, try the following:
• Disconnect the power, then reconnect.
• Press ON/OFF button on remote control to restart operation.
NOTE
If problem persists, contact a local dealer or your nearest customer service center. 
Provide them with a detailed description of the unit malfunction as well as your model 
number.
COMMON ISSUES
The following problems are not a malfunction and in most situations will not require repairs.










