Code 181 (Signal Fault, Ptc Input); Code 191 (High Water Level); Code 205 (Level Switch Inconsistency); Code 225 (Communication Error Pump Module) - Grundfos CU 241 Instrucciones De Instalación Y Funcionamiento

9.16 Code 181 (Signal fault, PTC input)

• Alarm code 181 is shown on the display.
• The alarm symbol on the display turns red and the pump stops.
• Alarm code Signal fault, PTC input is displayed in Grundfos
GO Remote.
Cause
There is a signal fault in the PTC input.
Remedy
• Make sure that the two PTC wires from the pump are
connected correctly to the terminals on the product.
• Make sure that the third PTC wire is left unconnected, if
present.
• Make sure that the PTC wires are undamaged.
• Make sure that the PTC sensors within the pumps are
undamaged.
• Perform a test by disconnecting the PTC wires from the
pump and shorting PTC1 terminal A and B and also PTC2
terminal A and B, and verify that the error is cleared.
• Replace the product due to damaged PTC circuit. Contact
Grundfos.

9.17 Code 191 (High water level)

• Alarm code 191 is shown on the display.
• The alarm symbol on the display turns red, but the pump's
operating mode is unchanged.
• Alarm code High water level is displayed in Grundfos GO
Remote.
Cause
The defined start level did not start the pump.
Remedy
• Check and configure the sensor start level.
Cause
The pump is not big enough to remove the water.
Remedy
• Contact Grundfos or an authorised service workshop.
Cause
The level sensor is defective and not reacting on level changes.
Remedy
• Check the functionality of the level sensor.

9.18 Code 205 (Level switch inconsistency)

• Alarm code 205 is shown on the display.
• The alarm symbol on the display turns red and the pump
stops.
• Alarm code Level switch inconsistency is displayed in
Grundfos GO Remote.
Cause
A float switch could be defective or stuck.
Remedy
• Check the functionality of each float switch.

9.19 Code 225 (Communication error pump module)

• Alarm code 225 is shown on the display.
• The alarm symbol on the display turns red and the pump
stops.
• Alarm code Communication fault, pump module is displayed
in Grundfos GO Remote.
• The product is unable to communicate with the IO module.
Cause
The connection to GENIbus is missing.
Remedy
• Check the GENIbus connection cable between CU 24X and
IO 242.
Cause
The pump module is defective.
Remedy
• Contact Grundfos.

9.20 Code 226 (Communication error IO module)

• Alarm code 226 is shown on the display.
• The alarm symbol on the display turns red and the pump
stops.
• Alarm code Communication fault, I/O module is displayed in
Grundfos GO Remote.
• The product is unable to communicate with the IO module.
Cause
The connection to GENIbus is missing.
Remedy
• Check the GENIbus connection cable between CU 24X and
IO 241.
Cause
The IO module is defective.
Remedy
• Contact Grundfos.

9.21 Code 229 (Water on floor)

• Warning code 229 is shown on the display if you press
the Up or Down button.
• The warning symbol on the display turns yellow and the pump's
operating mode is unchanged.
• Warning code Water on floor is displayed in Grundfos GO
Remote.
Cause
The sensor detects water on the floor.
Remedy
• Check for water leakage.

10. Technical data

Supply voltage
24 VDC, - 10 %/+ 10 %.
Power supply is required to be class 2.
Check that the supply voltage corresponds to the values stated on
the nameplate.
Maximum power dissipation
Object
99347490
* Excluding power to USB and CIM modules.
Maximum input power
Object
99347490
Enclosure class
IP54, 3R for CU 24X built into a panel of similar or higher enclosure
class.
GENIbus terminal
- 7 to + 12 VDC.
Nominal current condition: 4 mADC.
Short-circuit current condition: 328 mA.
Maximum power dissipation
*
3 W
Maximum input power
10 W
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