Troubleshooting - Carrier 40MBC-03 Owner's Manual

Troubleshooting

Refer to Table 3 before contacting your local dealer.
INDOOR UNIT
Clean Air Filter*
Change Remote Control Batteries
OUTDOOR UNIT
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†
* Increase frequency in dusty zones.
{ Maintenance to be carried out by qualified service personnel. Refer to the Installation Manual
PROBLEM
Unit/System Does Not Work
Cooling is Not Working
Properly
Heating is Not Working
Properly
Unit Stops During Operation
* 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.
Table 2—Periodic Maintenance
EVERY MONTH
S
EVERY MONTH
Table 3—Troubleshooting
POSSIBLE CAUSE
• The circuit breaker has tripped or a fuse
has blown.
• Power failure.
• Diagnostic lights illuminate.*
• Voltage is too low.
• 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.
• The filter is blocked with dust.
• Temperature is set too low.
• A window or door is open.
• The outdoor unit is obstructed.
• The Off timer is not operating correctly.
• Diagnostic lights illuminate.*
EVERY 6 MONTHS
EVERY 6 MONTHS
S
• 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.
• 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.
• Clean the air filter.
• Check the temperature and reset if necessary.
• Close the window or door.
• Remove the obstruction.
• Restart the operating mode.
• Call your service representative.
Edition Date: 09/16
12
EVERY YEAR
S
EVERY YEAR
S
S
S
S
S
S
SOLUTION
Catalog No:OM-40MBC-03
Replaces: OM-40MBC-38MAQ-02