Carrier 40MAQB09B3 User Manual

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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Replaces: OM-40MAQ-06

TROUBLESHOOTING

Refer to Table 2 before contacting your local dealer.

Table 1 — Periodic Maintenance

* Increase frequency in dusty zones.

† Maintenance to be carried out by qualified service personnel. Refer to the Installation Manual

Table 2 — Troubleshooting

* 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.

INDOOR UNIT EVERY MONTH EVERY 6 MONTHS EVERY YEAR

Clean Air Filter*



Replace Carbon Filter 

Change Remote Control Batteries

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† 

PROBLEM POSSIBLE CAUSE SOLUTION

Unit/System Does Not Work

 The circuit breaker has tripped or a fuse has

blown.

Diagnostic lights illuminate.*

 Voltage is too low.

 Reset the circuit breaker or replace the fuse with the

specified replacement fuse.

Call your service representative.

 Call your service representative.

Cooling is Not Working Properly

 The filter is blocked by 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.

 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.

Carrier 40MAQB09B3 Air Conditioner Cooling Area

User Manual - Page 12