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40MHHA: Owner's Manual
TROUBLESHOOTING (CONT)
PROBLEM
Poor Cooling Performance
The unit is not working
The unit starts and stops
frequently
Poor heating performance
Indicator lamps
continue flashing
Error code appears and begins
with the letters as the following in
the window display of indoor unit:
E(x), P(x), F(x) EH(xx), EL(xx),
EC(xx) PH(xx), PL(xx), PC(xx)
* 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.
NOTE: If your problem persists after performing the checks and diagnostics listed in the Troubleshooting tables, turn off the unit
immediately and contact an authorized service center.
© 2023 Carrier. All rights reserved.
A Carrier company
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 4 — Troubleshooting
POSSIBLE CAUSE
Temperature setting may be higher than ambient
room temperature
The heat exchanger on the indoor or outdoor unit is
dirty
The air filter is dirty
The air inlet or outlet of either unit is blocked
Doors and windows are open
Excessive heat is generated by sunlight
Too many heat sources in the room (people,
computers, electronics, etc.)
Low refrigerant due to leak or long-term use
SILENCE function is activated (optional function)
Power failure
The power is turned off
The fuse is burned out
Remote control batteries are dead
The Unit's 3-minute protection has been activated
Timer is activated
There's too much or too little refrigerant in the
system
Incompressible gas or moisture has entered the
system.
The compressor is broken
The voltage is too high or too low
The outdoor temperature is extremely low
Cold air is entering through doors and windows
Low refrigerant due to leak or long-term use
The unit may stop operation or continue to run safely. If the indicator lamps continue to flash or error codes appear,
wait for about 10 minutes. The problem may resolve itself. If not, disconnect the power, then connect it again. Turn
the unit on. If the problem persists, disconnect the power and contact your nearest
customer service center.
Edition Date: 02/23
Lower the temperature setting
Clean the affected heat exchanger
Remove the filter and clean it according to instructions
Turn the unit off, remove the obstruction and turn it back on
Ensure all doors and windows are closed while operating the
unit
Close windows and curtains during periods of high heat or
direct sunlight
Reduce amount of heat sources
Check for leaks, re-seal if necessary and top off refrigerant
SILENCE function can lower product performance by
reducing operating frequency. Turn off the SILENCE function.
Wait for the power to be restored
Turn on the power
Replace the fuse
Replace batteries
Wait three minutes after restarting the unit
Turn timer off
Check for leaks and recharge the system with refrigerant.
Evacuate and recharge the system with refrigerant
Replace the compressor
Install a manostat to regulate the voltage
Use auxiliary heating device
Ensure that all doors and windows are closed during use
Check for leaks, re-seal if necessary and top off refrigerant
14
SOLUTION
Catalog No: OM-40MHHA-01
Replaces: NEW
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