© 2022 Carrier. All rights reserved.
A Carrier Company
Edition Date: 07/22 Catalog No: 40MBAB-02OM
Replaces: 40MBAB-01OM
40MBAB: Owner’s Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
14
TROUBLESHOOTING (CONT)
When issues occur, please review the following common issues in Table 3 prior to contacting a service company.
Table 3 — Troubleshooting Tips
Problem Possible Causes Solution
Poor Cooling Performance
Temperature setting may be higher than the ambient
room temperature
Lower the temperature setting
The heat exchanger on the indoor or outdoor unit is
dirty
Clean the affected heat exchanger
The air filter is dirty Remove the filter and clean it according to instructions
The air inlet or outlet of either unit is blocked. Turn the unit to remove the obstruction and turn it back on
Doors and windows are open
Ensure that all doors and windows are closed while
operating the unit
Excessive heat is generated by sunlight
Close windows and curtains during periods of high heat or
bright sunshine
There are too many heat sources in the room (people,
computers, electronics, etc.)
Reduce the amount of heat sources
Low refrigerant due to leak or long-term use
Check for leaks, re-seal if necessary and top off the
refrigerant
The unit is not working
Power failure Wait for the power to be restored
The power is turned off Turn on the power
The fuse is burned out Replace the fuse
The unit’s 3-minute protection has been activated Wait three minutes after restarting the unit
Timer is activated Turn timer off
The unit starts and stops
frequently
There is too much or too little refrigerant in the
system
Check for leaks and recharge the system with refrigerant
Incompressible gas or moisture has entered the system Evacuate and recharge the system with refrigerant
System circuit is blocked
Determine which circuit is blocked and replace the
malfunctioning piece of equipment
The compressor is broken Replace the compressor
The voltage is too high or too low Install a manostat to regulate the voltage
Poor heating performance
The outdoor temperature is extremely low Use an auxiliary heating device
Cold air is entering through doors and windows Ensure that all doors and windows are closed during use
Low refrigerant due to leak or long-term use Check for leaks, re-seal if necessary and top off refrigerant
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