Install Instructions

Page 30mrcool.com
Refrigerant Piping Connection
5
Troubleshooting Tips
If your unit is not functioning or operating abnormally, please consult this list of common issues
and solutions before contacting technical support. These could save you both time and money.
Air conditioner
does not start
Power cord plug could be disconnected. Push plug firmly into outlet.
A fuse could be could be blown or the circuit breaker could be tripped. Replace fuse
with a time delay fuse or reset the circuit breaker.
Plug Current Device Tripped. Press the RESET button on the head of the power plug.
Power is OFF. Ensure the power is on
Air from unit
does not feel
cold
Room temperature is below operating range, 60°F (16°C). Cooling may not occur until
room temperature rises above 60°F (16°C).
Temperature sensor behind air filter contacting the cold coil. Keep it from the cold coil.
Adjust unit to a Lower temperature.
Compressor stops when changing modes. Wait for 3 minutes after setting to COOL mode.
Check for potential obstructions blocking the outdoor intake/exhaust. Clear any blockage.
Air conditioner
cooling, but room
is too warm & ice
is forming on coil
behind the front
cover.
Outdoor temperature is below 64°F (18°C). To defrost coil, set unit to FAN ONLY mode.
Air filter may be dirty. Clean filter. Refer to Care and Cleaning section. To defrost, set to
FAN ONLY mode.
Thermostat set too cold for night-time cooling. To defrost the coil, set to FAN ONLY mode.
Then, set temperature to a higher setting.
Problem Solution
Air conditioner
cooling, but room
is too warm- NO
ice is forming on
coil behind front
cover.
Air conditioner
turns on and off
rapidly
Noise when
unit is cooling
Dirty air filter is causing a restriction. Clean air filter. Refer to Care and Cleaning section.
Temperature is set too high, set temperature to a lower setting.
Air directional louvers positioned improperly. Position louvers for better air distribution.
Front of unit is blocked by drapes, blinds, furniture, etc. - restricting airflow. Clear
obstructions in front of unit.
An open door, window, or register may allow cold air to escape. Close any doors,
windows, or registers.
The room may be too warm. Allow additional time to remove insulated heat stored
in walls, ceiling, floor and furniture.
Dirty air filter causing airflow to be restricted. Clean air filter.
Outside temperature is extremely hot. Set FAN speed to a higher setting so more air
flows through cooling coils.
Check for potential obstructions blocking the outdoor intake/exhaust. Clear any blockage.
If it is a window vibration, it could be the result of a poor installation. Refer to installation
instructions, or check with installer.
Air movement sound- Normal sounds of unit. If too loud, select a slower FAN setting.