Hitachi RPI-4.0FSN4E - 14 BASIC TROUBLESHOOTING; CAUTION; SITUATIONS WHICH ARE NOT CONSIDERED AS A FAULT; THE SYSTEM DOES NOT WORK

14 BASIC TROUBLESHOOTING
CAUTION
If there is a leak in the indoor unit, it smells of smoke or white smoke is coming from the unit, switch off the unit immediately and contact
your HITACHI supplier.
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SITUATIONS WHICH ARE NOT CONSIDERED AS A FAULT
• Sound of damaged part: when starting or stopping the system, a screeching noise may be heard. This is due to heat deformation
of the plastic parts. This is a normal situation.
• Sound of refrigerant owing: as the system starts or stops, the sound of the refrigerant owing along the pipes is audible.
• Smells from the indoor unit: smells cling to the indoor unit after a long period of time. Clean the air lter and the panels or allow to
ventilate.
• Steam from the outdoor unit heat exchanger: during de-icing, ice on the outdoor unit heat exchanger melts, producing steam.
• Condensation on the air panel: if the system has been operating in cooling mode for a long period of time in high humidity (over
27 ºC DB, 80% relative humidity), condensation may form on the air panel.
• Condensation on the cabinet: if the system has been operating in cooling mode for a long period of time in high humidity (over
27 ºC DB, 80% relative humidity), condensation may form on the cabinet.
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THE SYSTEM DOES NOT WORK
Check whether the SET TEMPERATURE switch is set to the correct temperature.
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FAULTY OPERATION OF THE REFRIGERATION OR HEATING SYSTEM
• Check the outdoor or indoor units for obstructions in the air ow.
• Make sure that there are not too many sources of heat in the room.
• Check that the air lter is not blocked up with dust.
• Check whether or not the doors/windows are open. Check that the temperature is within the working range.
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IF THE PROBLEM PERSISTS…
If the problem persists after performing the above checks, please contact your service supply, giving them the following details:
• Name of the model of unit.
• Description of the problem.
• Alarm code number shown on the liquid crystal panel.
NOTE
Keep the main switch of the outdoor unit on (except when the system is not going to be used for a long period of time), as the com-
pressor oil heater deactivates.
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PMML0294A rev.2 - 07/2014
Basic troubleshooting
PMML0294A_rev.2_02-2014.indb 74 14/07/2014 12:28:40