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M. TROUBLESHOOTING
M.1. Troubleshooting Tips
SYMPTOM
POSSIBLE CAUSES
UNIT DOES NOT START
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UNIT NOT COOLING/
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HEATING ROOM
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DISPLAY HAS STRANGE
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NUMBERS/CHARACTERS
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ON IT
UNIT MAKING NOISES
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WATER DRIPPING
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OUTSIDE
WATER DRIPPING INSIDE
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ICE OR FROST FORMS ON
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INDOOR COIL
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COMPRESSOR
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PROTECTION
NOTES:
1.If circuit breaker is tripped or fuse is blown more than once,contact a qualified electrician.
2.If unit is installed where condensation drainage could drip in an undesirable location,an accessory drain kit should be installed and connected to drain
system
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Unit may have become unplugged
Fuse may have blown
Circuit breaker may have been tripped
Unit may be off or in wall thermostat mode.
Check section on dip switch settings to verify dip
switches are set properly.
Unit may be in a protection or diagnostic failure mode.
See section on Intelligent Self- checking Control.
Unit air discharge section is blocked
Temperature setting is not high or low enough Note:
Set-point limits may not allow the unit to heat or cool
the room to the temperature desired.
Check section on dip switch settings.
Unit air filters are dirty.
Room is excessively hot or cold when unit is started.
Vent door left open
Unit may be in a protection or diagnostic failure mode.
Check section on Intelligent Self---checking Control.
Compressor is in time delay. There is a protective time
delay (approx. 3 minutes) on starting the compressor
after a power outage (or restarting after it has been
turned off), to prevent tripping of the compressor
overload.
The unit may be in a diagnostic condition.
The unit may be set for C (instead of F).
Clicking, gurgling and whooshing noises are normal
during operation of unit.
If a drain kit has not been installed, condensation
runoff during very hot and humid weather is normal.
See Note 2. If a drain kit has been installed and is
connected to a drain system, check gaskets and fittings
around drain for leaks and plugs.
Wall sleeve is not installed level
Low outdoor temperature
Dirty filters
Power may have cycled, so compressor is in a restart
protection.
SOLUTIONS
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Check that plug is plugged securely in wall receptacle.
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Note : Plug has a test/reset button on it. Make sure that
the plug has not tripped.
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Replace the fuse. See Note 1.
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Reset circuit breaker. See Note 1.
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Turn unit on (bottom right button on keypad).
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Note: If the unit turns on, the LED will be green. If the
unit is off, the LED will be red. If there is no LED on,
there is a problem with power or damage to the control.
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Make sure that curtains, blinds or furniture are not
restricting or blocking unit airflow.
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Reset to a lower or higher temperature setting.
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Remove and clean filters.
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Allow sufficient amount of time for unit to heat or cool
the room.
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Start heating or cooling early before outdoor
temperature, cooking
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Heat or gatherings of people make room uncomfortable.
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Close vent door.
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Check dip switch settings for desired comfort.
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Wait approximately 3 minutes for compressor to start
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Check Intelligent Self - checking Control section to
determine if unit has had a failure.
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See the keypad configuration section.
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Wall sleeve must be installed level for proper drainage
of condensation. Check that installation is level and
make any necessary adjustments.
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When outdoor temperature is approximately 55 F or
below, frost may form on the indoor coil when unit is in
Cooling mode. Switch unit to FAN operation until ice or
frost melts.
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Remove and clean filters.
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Random Compressor restart - Whenever the unit is
plugged in, or power has been restarted, a random
compressor restart will occur. After a power outage, the
compressor will restart after approximately 3 minutes.
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Compress or Protection -To prevent short cycling of
the compressor, there is a random startup delay of
3 minutes and a minimum compressor run time of 3
minutes.
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