12
Troubleshooting
Refer to Table 3 before contacting your local dealer.
Table 2—Periodic Maintenance
INDOOR UNIT
EVERY MONTH
EVERY 6 MONTHS
EVERY YEAR
Clean Air Filter*
Change Remote Control Batteries
S
S
OUTDOOR UNIT
EVERY MONTH
EVERY 6 MONTHS
EVERY YEAR
Clean Outdoor Coil from Outside
Clean Outdoor Coil from Inside†
Blow Air Over Electric Parts†
Check Electric Connection Tightening†
Clean Fan Wheel†
Check Fan Tightening†
Clean Drain Pans†
S
S
S
S
S
S
S
* Increase frequency in dusty zones.
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Maintenance to be carried out by qualified service personnel. Refer to the Installation Manual
Table 3—Troubleshooting
PROBLEM
POSSIBLE CAUSE
SOLUTION
Unit/System Does Not Work
•
The circuit breaker has tripped or a fuse
has blown.
•
Power failure.
•
Diagnostic lights illuminate.
*
•
Voltage is too low.
•
Reset the circuit breaker or replace the fuse with
the specified replacement fuse.
•
Restart operation when the power is restored.
•
Call your service representative.
•
Call your service representative.
Cooling is Not Working
Properly
•
The filter is blocked with dust.
•
Temperature is not set properly.
•
A window or door is open.
•
The outdoor unit is obstructed.
•
The fan speed is too low.
•
The operation mode is in Fan instead of
Cool.
•
Clean the air filter.
•
Check the temperature and reset if necessary.
•
Close the window or door.
•
Remove the obstruction.
•
Change the fan speed selection.
•
Change the operating mode to Cool or reset the
unit.
Heating is Not Working
Properly
•
The filter is blocked with dust.
•
Temperature is set too low.
•
A window or door is open.
•
The outdoor unit is obstructed.
•
Clean the air filter.
•
Check the temperature and reset if necessary.
•
Close the window or door.
•
Remove the obstruction.
Unit Stops During Operation
•
The Off timer is not operating correctly.
•
Diagnostic lights illuminate.
*
•
Restart the operating mode.
•
Call your service representative.
* Diagnostic lights are a combination of lights that will illuminate in the display area on the unit. They are a combination of the lights you see during normal
operation.
Copyright 2016 Carrier Corporation
S
7310 W. Morris St.
S
Indianapolis, IN 46231
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No:OM-40MBC-03
Replaces: OM-40MBC-38MAQ-02
Edition Date: 09/16
