REMKO CMF 320 Duo - Manual (Page 31)

In the event that the red control
lamp lights up on the indoor
module, then the fault is on
the outdoor module. Two LEDs
are visible after removing the
enclosure panel which light up
in green and red during normal
operation (see adjacent figure).
If the LEDs flash, then there is a
fault. Causes and measures for
their remedy can be taken from
the following table.
green LED red LED Meaning Remedial measures
flashes 1 times
flashes 1 times
Phase error: The supply cable to the outdoor
module or the connection between the
indoor and outdoor modules is not correct. Check the electrical connection (swapped
phases)
Check connection cable
flashes 2 times
One of the connectors has been removed
from the PCB or has intermittent contact Check all connectors on the PCB, check
high and low pressure sensors
flashes 3 times Fault on PCB Exchange PCB
flashes 2 times
flashes 1 times
Wiring error between indoor and outdoor
modules Check connection cable for correct
polarity and proper contact
flashes 2 times
Data transfer error between indoor and
outdoor modules
Check if the connection cable has been
improperly extended or incorrectly
connected
flashes 3 times
flashes 1 times
Hot gas temperature in refrigerant circuit
too high or hot gas heating too low
Check refrigerant; check hot gas
temperature sensor; check expansion
valve
flashes 2 times
High pressure valve has tripped
Open any closed ball valves, check for
excess refrigerant
Low pressure cut-off switch has tripped
Open any closed ball valves, check for
excess refrigerant
No voltage on condenser Check power supply to the condenser
flashes 3 times
Overheating protection tripped, excessive
liquid temperature in refrigerant circuit
Clean dirty heat exchanger on outdoor
module; rectify possible pneumatic short
circuit on the outdoor device.
flashes 4 times
Circuit breaker on condenser (overload)
has tripped, or no operating voltage at
the condenser Open any closed spherical valves; check
supply voltage; exchange faulty control
panel
flashes 5 times
Fault in hot gas temperature sensor or fin
temperature sensor (cable breakage or
short circuit)
Check PCB connector for firm connection,
check functionality of the sensor
flashes 6 times
Temperature fault on inverter cooling
block Rectify obstruction to flow in outdoor
module
flashes 7 times Fault in power supply Check and repair power supply
flashes 4 times
flashes 1 times
Fault on liquid line sensor (cable breakage
or short circuit) Check PCB connector for firm connection,
check functionality of the sensor
flashes 4 times
Temperature of liquid line too high / too
low Check refrigerant line or
refrigerant level
Flashing code on outdoor module
LEDs
LEDs on outdoor module
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