Lennox LI012HI-210P432 Service Manual page 40

Service Manual
Malfunction
NO.
Name
Gathering
11
refrigerant
Indoor
ambient
temperature
12
sensor is
open/short
circuited
Indoor
evaporator
temperature
13
sensor is
open/short
circuited
Outdoor
ambient
temperature
14
sensor is
open/short
circuited
Outdoor
condenser
temperature
15
sensor is
open/short
circuited
Outdoor
discharge
temperature
16
sensor is
open/short
circuited
Limit/
decrease
17 frequency
due to
overload
Decrease
frequency
18
due to
overcurrent
Installation and Maintenance
Display Method of Indoor Unit
Indicator Display (during
blinking, ON 0.5s and OFF
Dual-8
0.5s)
Code
Display
Operation Cool Heating
Indicator Indicator Indicator
Fo
F1
F2
F3
F4
F5
F6
F8
A/C status
When the outdoor unit receive
signal of Gathering refrigerant
,the system will be forced to
run under cooling mode for
gathering refrigerant
During cooling and drying
operation, indoor unit operates
while other loads will stop;
during heating operation,
the complete unit will stop
operation.
AC stops operation once
reaches the setting
temperature. Cooling, drying:
internal fan motor stops
operation while other loads
stop operation; heating: AC
stop operation
During cooling and drying
operating, compressor stops
while indoor fan operates;
During heating operation,
the complete unit will stop
operation
During cooling and drying
operation, compressor stops
while indoor fan will operate;
During heating operation,
the complete unit will stop
operation.
During cooling and drying
operation, compressor will sop
after operating for about 3
mins,
while indoor fan will operate;
During heating operation, the
complete unit will stop after
operating for about 3 mins.
All loads operate normally,
while
operation frequency for
compressor is decreased
All loads operate normally,
while
operation frequency for
compressor is decreased
Possible Causes
Nominal cooling mode
1. Loosening or bad contact of
indoor ambient temp. sensor and
mainboard terminal.
2. Components in mainboard fell
down leads short circuit.
3. Indoor ambient temp. sensor
damaged.(check with sensor
resistance value chart)
4. Mainboard damaged.
1. Loosening or bad contact of
Indoor
evaporator temp. sensor and
mainboard terminal.
2. Components on the mainboard
fall
down leads short circuit.
3. Indoor evaporator temp. sensor
damaged.(check temp. sensor
value
chart for testing)
4. Mainboard damaged.
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
1.Outdoor temperature sensor
hasnt been connected well or is
damaged. Please check it by
referring to the resistance table for
temperature sensor)
2.The head of temperature sensor
hasnt been inserted into the copper
tube
Refer to the malfunction analysis
(overload, high temperature
resistant)
The input supply voltage is too low;
System pressure is too high and
overload
37