Following Symptoms Are Not Air Conditioner Troubles; Troubleshooting - Bosch Climate 5000 VRF MDCI10-1 Owner's Manual

6. FOLLOWING SYMPTOMS ARE NOT
AIR CONDITIONER TROUBLES
Symptom 1: The system does not operate
The air conditioner does not start immediately after the
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ON/OFF button on the romote controller is pressed. If the
operation lamp lights, the system is in normal condition.
To prevent overloading of the compressor motor, the air
conditioner starts 3 minutes after it is turned ON.
If the operation lamp and the „PRE-DEF indicator(cooling
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and heating type) or fan only indicator(cooling only type)"
light, it means you choose the heating model, When just
starting, if the compressor has not started, the indoor unit
appears „anti cold wind" protection because of its overlow
outlet temperature.
Symptom 2: Change into the fan mode
during cooling mode
In order to prevent the indoor evaporator frosting, the
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system will change into fan mode automatically, restore to
the cooling mode after soon.
When the room temperature drops to the set temperature,
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the compressor goes off and the indoor unit changes to
fan mode; when the temperature rises up, the compressor
starts again. It is same in the heating mode.
Symptom 3: White mist comes out of a unit
Symptom 3.1: Indoor unit
When humidity is high during cooling operation If the
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interior of an indoor unit is extremely contaminated, the
temperature distribution inside a room becomes uneven.
It is necessary to clean the interior of the indoor unit. Ask
your dealer for details on cleaning the unit. This operation
requires a qualified service erson
Symptom 3.2: Indoor unit, outdoor unit
When the system is changed over to heating operation
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after defrost operation Moisture generated by defrost
becomes steam and is exhausted.
Symptom 4: Noise of air conditionerscooling
Symptom 4.1: Indoor unit
A continuous low „shah" sound is heard when the system
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is in cooling operation or at a stop.
When the drain pump (optional accessories) is in operation,
this noise is heard.
A „pishi-pishi" squeaking sound is heard when the system
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stops after heating operation.
Expansion and contraction of plastic parts caused by
temperature change make this noise.
Heat Pump Mini VRF Outdoor Unit

FOLLOWING SYMPTOMS ARE NOT AIR CONDITIONER TROUBLES | 9

Symptom 4.2: Indoor unit, outdoor unit
A continuous low hissing sound is heard when the system
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is in operation.
This is the sound of refrigerant gas flowing through both
indoor and outdoor units.
A hissing sound which is heard at the start or immediately
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after stopping operation or defrost operation.
This is the noise of refrigerant caused by flow stop or flow
change.
Symptom 4.3: Outdoor unit
When the tone of operating noise changes.
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This noise is caused by the change of frequency.
Symptom 5: Dust comes out of the unit
When the unit is used for the first time in a long time.
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This is because dust has gotten into the unit.
Symptom 6: The units can give off odours
The unit can absorb the smell of rooms, furniture,
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cigarettes, etc., and then emit it again.
Symptom 7: The outdoor unit fan does not
spin
During operation. The speed of the fan is controlled in
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order to optimize product operation.

7. TROUBLESHOOTING

7.1 Troubles and causes of air conditioner
If one of the following malfunctions occur, stop operation,
shut off the power, and contact with your dealer.
The operation lamp is flashing rapidly (twice every second)
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This lamp is still flashing rapidly after turn off the power and
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turn on again.
Remote controller receives malfunction or the button does
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not work well.
A safety device such as a fuse, a breaker frequently
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actuates.
Obstacles and water enter the unit.
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Water leaks from indoor unit.
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Other malfunctions.
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If the system does not properly operate except the above
mentioned cases or the above mentioned malfunctions is
evident, investigate the system according to the following
procedures. (See in Table 7-1)
6 720 844 640 (2015/11)