Air Conditioner Operation In Thermistor Error - Bosch CLC6101i-W 50 HE Service Manual

[2] AIR CONDITIONER OPERATION IN THERMISTOR ERROR

* These models have following thermistors
INDOOR UNIT OUTDOOR UNIT
TH1, TH2 TH1, TH2, TH3, TH4, TH5
The errors for the thermistors that are not mentioned above are irrelevant.
These indoor units don't have power relay.
These models don't have Heating operation.
1.Indoor unit
Item Mode
Room tempera- Auto
ture thermistor
(TH1)
Cooling
Dehumidifying
Heating
Heat exchanger Cooling
thermistor (TH2) Dehumidifying
Heating
2.Outdoor unit
Item Mode
Compressor Cooling
discharge Dehumidifying
thermistor Heating
(TH1)
Heat exchanger Cooling
thermistor (TH2) Dehumidifying
Heating
When resistance
is low (tem-
Control opera-
perature judged
tion
higher
actual)
Operation mode Cooling mode is
judgment activated even if
room temperature
is low.
Frequency con- Room becomes
trol too cold.
Room tempera- Normal operation. Room temperature is
ture memory
Frequency con-
trol
Frequency con- Room does not
trol become warm.
Freeze preven- Indoor unit
tion evaporator may
freeze.
Cold air preven- Cold air preven-
tion Cold tion deactivates
too soon and cold
air discharges.
When resistance is
Control opera- low (temperature
tion judged higher than
actual)
Expansion valve Compressor operates,
control and com- but room does not
pressor protec- become cool or warm
tion (expansion valve is
open).
Outdoor unit heat Compressor operates
exchanger over- at low speed or stops.
heat prevention
Expansion valve Defrosting operation
control Defrost- is not activated as
ing needed, and frost ac-
cumulates on outdoor
unit (expansion valve is
closed).
Climate Class 6100i / 6000i / 8100i / 8000i
Short-circuit
than
Cooling mode is activat-
ed in most cases.
Air to air conditioner
operates in full power
even when set tempera-
ture is reached.
stored in memory as
31.0°C, and compressor
does not stop.
Hot keep status results
immediately after opera-
tion starts.
Frequency does not
increase above
30 Hz (40 Hz).
Indoor unit evaporator
may freeze.
Compressor operates
at low speed or stops,
and frequency does not
increase.
Short-circuit
Compressor high
temperature error
indication.
Outdoor unit
thermistor
short-circuit error
indication.
Outdoor unit
thermistor
short-circuit error
indication.
4-3
When resistance
is high (tem-
perature judged Open-circuit
lower than actu-
al)
Heating mode is Heating mode is
activated even if always activated.
room temperature
is high.
Room does not Compressor does not
become cool. operate.
Normal operation. Room temperature is
stored in memory as
18.5°C, and compres-
sor does not operate.
Room becomes Air conditioner oper-
too warm. ates in full power even
when set temperature
is reached.
Compressor Compressor does not
stops occasional- operate.
ly.
Cold air preven- Cold air prevention
tion deactivates does not deactivate,
too slow. and indoor unit fan
does not rotate.
When resistance is
high (temperature
Open-circuit
judged lower than
actual)
Layer short-circuit Outdoor unit therm-
or open-circuit may istor open-circuit
result in compressor error indication.
in normal operation.
Normal operation. Outdoor unit therm-
istor open-circuit
error indication.
Defrosting operation Outdoor unit therm-
is activated unnec- istor open-circuit
essarily, and room error indication.
does not become
warm (expansion
valve is open).