Applicable Systems
MAGNA1
Symptoms
The Grundfos MAGNA1 pump displays alarm code 10, indicating a pump communication fault. Communication between different parts of the pump electronics has been disrupted.
Possible Causes
- Internal electronics communication cable loose or damaged
- Pump control board hardware fault causing communication failure
- Electromagnetic interference disrupting internal communication
- Firmware corruption causing communication protocol errors
Troubleshooting Steps
- Step 1: Power cycle the pump by switching off main power
Wait until all indicator lights are off, then restore power; transient faults may clear - Step 2: Check for sources of electromagnetic interference nearby
Variable frequency drives, large contactors, and radio transmitters can cause EMI - Step 3: Inspect pump cable connections to power supply
All power and communication connections must be tight and corrosion-free - Step 4: If fault persists, replace the pump or contact Grundfos Service
Internal communication faults typically require pump replacement as electronics are integrated
How to Reset
To reset: 1) Switch off the power supply until the indicator lights are off. 2) Switch the power back on. 3) If the alarm returns, the pump electronics may need replacement. Contact Grundfos Service with the alarm code and pump serial number.
Frequently Asked Questions
- Q: What does alarm code 10 mean on Grundfos MAGNA1?
Code 10 indicates a communication fault between different parts of the pump electronics. This is an internal fault that typically requires professional service.
- Q: Can I still run the pump manually with code 10 active?
No. When code 10 is active, the pump is stopped and cannot be restarted until the alarm is reset. The internal communication fault must be resolved first.
Source: Grundfos MAGNA1 Installation and Operating Instructions, Fault Finding Table, Document 6908923
Category: Pump