Troubleshooting; Safety Caution; Error Diagnosis And Solution Without Error Code - Omega OTEC IEWB Series Service Manual

2 Troubleshooting

2.1 Safety caution

⚫ Be sure to turn off all power supplies or disconnect all wires to avoid electric shock. While
checking indoor/outdoor PCB, please equip oneself with antistatic gloves or wrist strap to avoid
damage to the board.
⚫ Electricity remains in capacitors even when the power supply is off.
⚫ Ensure the capacitors are fully discharged before troubleshooting.
(Test the voltage between P and N on back of the main PCB with multimeter. If the voltage is lower
than 36V, the capacitors are fully discharged.)

2.2 Error diagnosis and solution without error code

Some phenomena are easily thought as error, but actually not.
Phenomena
The unit can't be restarted just after shut down.
(RUN lamp is ON)
Air is not blown out at starting of heating
operation.
Air is not blown out for 6 to 12 min in heating
mode
The unit will not stop blowing out the air
immediately after shut down at cooling operation
(some model)
Air is not blown out at dehumidification
operation.
Reasons
Restart stop for 3 minutes after shut down to
protect the unit. Three minutes protection timer
incorporated in the microcomputer actuates
automatically. Except that power is connected,
this function does not actuate.
Air blow is stopped to prevent blowing out cold
air when the indoor heat exchanger is not
warmed enough. (2 to 5 min)
When outdoor temperature is low and humidity
is high, the unit sometimes performs defrosting
mode automatically.
defrosting mode, water or steam are raising from
the outdoor unit.
The drying function may be activated, please
wait for the end of the operation or use the
remote control to turn off the drying function.
The louver will not close down until after 30
seconds.
Indoor fan is sometimes stopped to prevent
moisture from evaporating and to save energy.
Please wait. During
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