Lennox MLA018S4S-1P Installation Instructions

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Troubleshooting
Table 7. Troubleshooting Codes
Code Description
E0 Indoor unit EEPROM error
E1 Communication error between indoor unit and outdoor unit
E3 Indoor fan speed error
E4 Indoor return air temperature sensor error
E5 Indoor coil temperature sensor error
EC Low refrigerant
EE High water level alarm
F0 Outdoor current overload sensed
F1 Outdoor ambient temperature sensor error
F2 Outdoor coil temperature sensor error
F3 Compressor discharge temperature sensor error
F4 Outdoor unit EEPROM error
F5 Outdoor unit fan speed error
P0 Inverter module IPM error
P1 High or low voltage protection
P3 Outdoor unit low temperature lockout
P4 Compressor drive error
-- Mode conict
P6 Compressor high-pressure or low-pressure switch open
Test Run
Pre-Checks
Only perform test run after you have completed the
following steps:
• Electrical Safety Checks – Conrm that the unit’s
electrical system is safe and operating properly
• Refrigerant Leak Checks – Check all are nut connec-
tions and conrm that the system is not leaking
• Conrm that gas and liquid valves are fully open
Procedure
You should perform the Test Run for at least 30 minutes.
1. Connect power to the unit.
2. Press the ON/OFF button on the remote controller to
turn it on.
3. Press the mode button to scroll through the following
functions, one at a time:
• COOL - Select lowest possible temperature
• HEAT - Select highest possible temperature
4. Let each function run for 5 minutes, and perform the
following checks:
Table 8. Test Run Checklist
Checks Pass Fail
No electrical leakage
Unit is properly grounded
All electrical terminals
properly covered
Indoor and outdoor units are
solidly installed
All pipe connection points do
not leak
Water drains properly from
drain hose
All piping is properly
insulated
Unit performs COOL function
properly
Unit performs HEAT function
properly
Indoor unit louvers rotate
properly
Indoor unit responds to
remote controller
Dry Mode Operation (Dehumidication)
Procedure
1. Using the provided wireless remote control, press the
MODE button and select DRY mode.
2. Press the UP/ DOWN button to select the desired
temperature. The temperature setting range is from
62°F (17°C) to 86°F (30°C) in one degree increments.
NOTE: The blower is preset at a low speed and cannot be
changed therefore it will get cold and most likely
will over shoot the temperature setting by 6-10°F
(3-5°C) depending on the room size or other
various factors. Also the Follow Me mode does
not operate in this mode.
NOTE: In addition, the indoor units do not have a humidistat
installed therefore they are unable to determine
humidity levels. This product is not recommend as
a main source for dehumidication.
Sequence of Operation
When in dry mode operation the unit is actually in cooling
mode with a low speed blower operation. Set remote temp
to a lower room temp to begin the dry mode operation.
The compressor will stop when the room temperature is
4°F (2°C) lower than the temperature setting.
However there is a temperature compensation for cooling
mode that is two degrees Celsius. So the unit will stop
when the temperature is 8°F (4°C) lower than the room
temperature settings.

Lennox MLA018S4S-1P Specifications

General

Brand	Lennox
Model	MLA018S4S-1P
Category	Air Conditioner
Language	English