Carrier 40MB*F Owner's Manual page 24

Table 9-2
, Power failure.
• Power switch is off.
Fuse may have burned.
Batteries of remote controller exhausted
or other problem of controller.
Temperature is not set correctly.
° The compressor is on 3 minute
protection mode cycle.
Refrigerant is too low or too high.
* Air or no concentrating gas in the refriger-
ating circuit.
Compressor has malfunctioned.
, Voltage is too high or too low.
System circuit is blocked.
Outdoor and indoor units heat exch-
anger are dirty.
, The air filter is dirty.
Inlet/outlet of indoor/outdoor units are blo-
cked.
Doors and windows are open.
o Sunlight shines directly on indoor unit.
* The heat resource is extremely high.
o Outdoor temperature, is too high.
Refrigerant leak or lack of refrige-
rant.
, Outdoor temperature is lower than 7C
, Doors and windows not are completely
closed.
Refrigerant leak or lack of refrigerant.
, Wait for the return of power.
• Switch on the power.
, Replace the fuse.
• Replace the batteries or check the con-
troller.
, Set the temperature properly.
, Wait.
, Check for leaks, and recharge ref-
rigerant levels accordingly.
Vacuum and recharge refrigerant.
Repair or change compressor.
° Install manostat.
• Find reasons and address issue(s)
accordingly.
- Clean the heat exchangers.
• Clean the air filter.
• Eliminate the dirt.
, Close doors and windows.
• Arrange the curtains to shelter from
sunshine.
• Reduce heat source.
• AC cooling capacity reduces (normal).
Check leakage and recharge refrigerant.
° Use heating device.
, Close doors and windows.
, Check leakage and rightly recharge
refrigerant.
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