SHARP(CHINA)INVESTMENT CO.,LTD
[2] AIR CONDITIONER OPERATION IN THERMISTOR ERROR
1. Indoor unit
Item Mode Control
operation
When resistance is
low (tempera-ture
judged higher than
actual)
Short-circuit When resistance
is high (tempera-
ture judged lower
than actual)
Open-circuit
Auto Operation mode
judgment
Cooling mode is
activated even if room
temperature is low.
The unit stops Heating mode is
activated even if room
temperature is high.
The unit stops
Cooling Frequency con-
trol
Room becomes too cold The unit stops Room does not
become cool.
The unit stops
Dehumidifying Room temperature
memory frequency
control
Normal operation. The unit stops Normal operation. The unit stops
Room tempe-
rature ther-
mistor (TH1)
Heating Frequency control Room does not become
warm
The unit stops Room becomes too
warm.
The unit stops
Cooling
Drying
Freeze prevention Indoor unit evaporator
may freeze.
The unit stops Compressor stops
occasionally.
The unit stops Heat exchanger
thermistor (TH2)
Heating Cold air prevention Cold air prevention
deactivates too soon
and cold air discharges.
The unit stops Cold air prevention
deactivates too slow.
The unit stops
2. Outdoor unit
13
Outdoor unit
discharge thermistor
open-circuit error
Indoor and outdoor unit stops
if there is short-circuit or
break in outdoor unit heat
exchanger thermistor
At compressor
startup
Operation OFF or ON E3 yes yes
14
Outdoor unit outside
air temperature
ther-mistor
short-circuit error
Indoor and outdoor unit stops
if there is short-circuit or
break in outdoor unit heat
exchanger thermistor
At compressor
startup
Operation OFF or ON E8 yes yes
15
Discharge pipe
temperature themister
short-circuit error
Indoor and outdoor unit stops
if there is short-circuit or
break in outdoor unit heat
exchanger thermistor
At compressor
startup
Operation OFF or ON E8 yes yes
16
Discharge pipe
temperature themister
open-circuit error
Indoor and outdoor unit stops
if there is short-circuit or
break in outdoor unit heat
exchanger thermistor
At compressor
startup
Operation OFF or ON E8 yes yes
17
Serial signal error Indoor and outdoor unit stops
if outdoor unit cannot receive
serial signal from indoor unit
for 2minutes.
When in
operation
Reset after reception of
serial signal
E0 yes yes
18
Outdoor unit DC fan
error
Operation stops if there is no
input of rotation pulse signal
from out-door unit fan motor
for 30 seconds
When outdoor
unit fan is in
operation
Operation OFF or ON EF yes yes
3-2
Description
Detection
period
Reset condition
Indoor unit
error display
Indoor
unit
Outdoor
unit
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