Lennox VRF V22B Series User Manual page 9

The table below lists possible causes and solutions to some of the most common problems. Please review this information
before calling for service.
Symptom
Unit does not start.
Indoor fan is operating;
however, air is not cool.
Unit cycles on and off frequently.
Unit not cooling properly.
Unit not heating properly.
Fan speed cannot be changed.
Remote control signal is not
being trans mitted, even when
ON/OFF button is pressed.
The TEMP adjustment indicator
is not available.
Operation indicator disappears
from the display after a period
of time.
TIMER ON disappears from the
display after a period of time.
No tones being sounded by
indoor unit, even when ON/OFF
button is pressed.
Possible Cause
• Power failure.
• Power to unit is OFF or disconnected.
• Circuit breaker may be tripped or
fuse may be blown.
• Remote control batteries may have
lost their charge or unit controller
may have malfunctioned.
• Temperature not properly set at con-
trol.
• Compressor may be kept off by delay.
• Refrigerant charge is incorrect.
• Air in refrigerant circuit.
• Compressor malfuction.
• Improper voltage.
• System refrigerant circuit is blocked.
• Indoor and/or outdoor coil are dirty.
• Air filter is dirty.
• Air flow 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 refrigerant leak.
• Doors and/or windows are open.
• Suction pressure is low due to
possible refrigerant leak.
• Check the mode listed on the unit dis-
play. Fan speed cannot be changed
in the AUTO or DRY mode.
• Batteries may have lost their charge. •
• Check the mode listed on the unit
dis play. Temperature
adjusted in the FAN ONLY mode.
• Check to see if display reads TIMER
OFF.
• Check to see if display reads TIMER
OFF.
• Infra-red receiver must be able to see
signal from remote control.
• Batteries may have lost their charge.
Possible Solution
• Wait for power to be restored.
• Turn on or reconnect power to the unit.
• Reset circuit breaker or replace fuse.
• Replace batteries in remote control.
Check controller for proper function.
• Check temperature setting at control.
• Wait for delay to expire.
• 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.
• Clean indoor and/or outdoor coil.
• Clean or replace air filter.
• 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.
• Close doors and windows.
• Check for refrigerant leaks and prop-
erly charge system.
• Fan speed cannot be changed in
AUTO or DRY mode. Change mode to
COOL, FAN ONLY or HEAT.
Replace batteries.
• Change the mode to COOL, HEAT or
cannot be
DRY.
• Timed operation is terminated at the
end of the TIMER period.
• Timed operation is terminated when
time period has expired.
• Aim remote control infra-red transmit-
ter directly at receiver.
• Replace batteries.
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