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156 Other fault Internal communication failure in frequency converter A
Internal communication fault in the pump due to defect
in the terminal box.
Contact Grundfos Service.
175
Temperature sensor 2 signal outside
signal range
Temperature sensor 2 signal fault 1)
Same as fault 91. Same as fault 91.
190
191
Limit 1 exceeded
Limit 2 exceeded
Limit 1 exceeded
Limit 2 exceeded
1)
This is a monitoring function offering information,
alarm or warning if a low or high limit is exceeded.
The function can only be set with the PC Tool
E-products.
The function can be set to monitor
• sensor 1 or 2
• Pt100 sensor 1 or 2
• external setpoint
• the feedback signal.
The limit set has been exceeded either upwards or
downwards.
Procedure:
1. Using PC Tool E-products, check which function is being monitored.
2. Check in the pump system whether the alarm or warning is real. If it is
real, remedy the fault.
3. If the alarm or warning seems to be wrong for the pump system,
troubleshoot according to the selected sensor using these service
instructions.
240 Relubricate motor bearings Motor bearings need lubrication (service information) W
The motor has reached the number of operating hours
stated in the configuration for the bearing lubrication.
Lubricate the bearings. See section 4.1 Lubrication of motor bearings.
Fault code Fault reading in the R100 Fault reading in PC Tool E-products Fault type
Explanation/cause Remedy
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