REMKO SuperTec-Monitor - Manual (Page 28)

Fault code Meaning Cause Remedial measures
U6
Power modules in the inverter
circuit defective.
If overcurrent is detected in the
inverter circuit ("UF" or "UP"
is displayed), the inverter circuit
is defective and fault message
"U6" is issued.
Faulty ball shut-off valve (not
fully open).
Increase in supply voltage.
Poor or detached contacts of
the connection cables to the
condenser or reversed phases.
Condenser defective. Voltage
board defective.
Check and fully open all ball
shut-off valves.
Check supply voltage (mains).
Check condenser wiring and
correct (phases U, V, W).
Check condenser, replace
condenser if defective
Replace defective voltage board
on the outdoor unit.
U7
Overheating interrupted by too
low hot gas temperature
If the overheating is around -15
K for over 3 mins, the LEV is
almost closed (lowest impulse
rate) and 10 mins have passed
since the condenser was started
up, fault message "U7" is
issued.
Poor or detached contacts of
the cables and connectors of
the hot gas temperature sensor
TH4 on the control board. Hot
gas temperature sensor TH4
not properly secured.
Poor or detached contacts of
the cables and connectors on
the LEV drive.
Poor or detached contacts of
the LEV cables on the control
board.
LEV defective.
Check contacts, cables and
connections of the temperature
sensor TH4 and repair.
Secure temperature sensor TH4
properly.
Check contacts, cables and
connections of the LEV drive and
repair.
Check LEV and replace.
U8
Speed fault on the fan motor.
The speed of the fan motor is
determined to be faulty if:
at an outdoor temperature
above 20 °C for a duration of
15 s, a maximum of only 100
rpm is measured.
for a duration of one minute,
less than 50 rpm or over 1500
rpm is measured.
Fan motor defective.
Control board defective.
Check fan motor and replace
defective motor.
Check control board and replace
defective circuit board
REMKO SYSTEM MONITOR
FOR REMKO SUPERTEC INVERTER
28