Question: What do the colored lights on the Magna refer to?

Buy New or Surplus GRUNDFOS CU-352 ( DISCONTINUED BY MANUFACTURER, MULTI PUMP CONTROL UNIT, 100-240 VAC, 50/60 HZ, 22 W ) parts. Radwell also repairs GRUNDFOS CU-352. CIM modules are add-on modules that allow communication with E-pumps, circulator pumps, Multi Pump Controller (CU 352), Hydro Multi-E, Hydro Multi-B and Dedicated Controls (CU 362) and Level Control LC 2x1 for wastewater pumps or LC 2X2 for submersible pumps.

Answer: Each color and rotation provides status information at a quick glance. It is helpful especially helpful when the pumps are in ceilings. Aside from the Magna series, this feature is now on the newly expanding ECM pumps up to 15 HP such as the CRE, CRE-DP, VLSE and CMBE series. Below is the reference Grundfos “eye chart” that explains specifically what each display means:

Grundfos Cu 352 Controller Manual

Grundfos Cu 301 Manual

Keep in mind that when the eye is yellow it is a important “warning” and the pump will continue to run. However, the cause needs to be addressed with a sense of urgency. If it turns red, game over because it stops dead. For more info on Magna fault codes, go to the Magna 3 FAQ section for the most common errors and fixes at https://pumphvac.com/magna-3-faqs/