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Troubleshooting
12
Troubleshooting
The significance of the red LED (fig. 6 2, page 5, fig. 7 2, page 6)
For operational faults it illuminates several times. The number of pulses
depends on the type of fault.
Each flash lasts for one quarter of a second. After the series of impulses a
pause follows. The sequence for the fault is repeated every four seconds.
Number of
Fault
flashes
1
Line Voltage
2
Excessive fan current
3
The motor doesn't start
4
Speed too low
5
Overheating of the elec-
tronics unit
Constantly
NTC errors
30
CRX1050 – CRX1140
Possible cause
The supply voltage is outside of the set range.
The fan load on the electronics unit is more
than 1 A.
The rotor is jammed.
The pressure difference in the cooling system
is too high (> 5 bar).
If the cooling system is overloaded, the mini-
mum speed of the motor of 1,850 rpm cannot
be maintained.
If the cooling system is loaded too heavily or
the temperature is set too high, the electronics
can overheat.
NTC is defective.
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