Bosch CLC6001i 25 E, Service Manual

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