Lennox MCFA User Manual

6
Table 1. Troubleshooting
Symptom Possible Cause Possible Solution
Unit does not start.
• Power failure
• Power to unit is OFF or disconnected
• Circuit breaker may be tripped or fuse may be
blown
• Wireless remote control batteries may have
lost their charge or unit controller may have
malfunctioned
• Wait for power to be restored
• Turn on or reconnect power to the unit
• Reset circuit breaker or replace fuse
• Replace AAA size batteries in wireless remote
control. Check controller for proper function
Indoor fan is operating; however, air is
not cool.
• Temperature not properly set at con trol
• Compressor may be kept off by delay
• Check temperature setting at control
• Wait for delay to expire
Unit cycles on and off frequently.
• Refrigerant charge is incorrect
• Air in refrigerant circuit
• Compressor malfunction
• Improper voltage
• System refrigerant circuit is blocked
• Check for refrigerant leaks and prop erly charge
system
• Evacuate and properly charge system
• Check compressor and replace, if ne cessary
• Check with utility company to provide proper
voltage
• Clear blockage
Unit not cooling properly.
• Indoor and/or outdoor coil are dirty
• Air lter is dirty
• Air ow around indoor and/or outdoor unit is
obstructed
• Doors and/or windows are open
• Direct sunlight is affecting indoor tem perature
• Heat source inside is placing a large burden on
the system
• Suction pressure is low due to possible refrig-
erant leak
• Clean indoor and/or outdoor coil
• Clean or replace air lter
• Remove obstructions
• Close doors and windows
• Use curtains or blinds to block direct sunlight.
• Reduce burden of heat source
• Check for refrigerant leaks and prop erly charge
system
Unit not heating properly.
• Doors and/or windows are open
• Suction pressure is low due to possible refrig-
erant leak
• Close doors and windows
• Check for refrigerant leaks and prop erly charge
system
Fan speed cannot be changed.
Check the mode listed on the unit dis play. Fan
speed cannot be changed in the AUTO or DRY
mode
Fan speed cannot be changed in AUTO or DRY
mode. Change mode to COOL, FAN ONLY or HEAT.
Wireless remote control signal is not
being trans mitted, even when ON/OFF
button is pressed.
Batteries may have lost their charge Replace AAA size batteries (2)
The TEMP adjustment indicator is not
available.
Check the mode listed on the unit dis play.
Temperature cannot be adjusted in the FAN ONLY
mode
Change the mode to COOL, HEAT or DRY
Operation indicator disappears from
the display after a period of time.
Check to see if display reads TIMER OFF
Timed operation is terminated at the end of the
TIMER period
TIMER ON disappears from the display
after a period of time.
Check to see if display reads TIMER OFF
Timed operation is terminated when time period has
expired.
No tones being sounded by indoor unit,
even when ON/OFF button is pressed.
• Infra-red receiver must be able to see signal
from wireless remote control
• Batteries may have lost their charge
• Aim wireless remote control infra-red transmit ter
directly at receiver
• Replace AAA size batteries (2)

Lennox MCFA Specifications

General

Brand	Lennox
Model	MCFA
Category	Air Conditioner
Language	English