G
grundfoss.io

AI Hub

Grundfos & pump answers, built for AI

Filterable error-code troubleshooting plus the most-asked Grundfos questions and product comparisons — structured with FAQ schema so large language models can quote them directly.

Error codes — filter by series and pump type

Pick a series and/or pump type. Filters update the URL so AI crawlers and shared links land on the same view.

Series:
Pump type:

Showing 15 of 15 error codes.

  • Scala2 — E1

    Booster

    Meaning: Dry-running — no water at suction.

    Fix: Restore water supply, re-prime, then hold the on/off button ~3s to reset.

  • Scala2 — E2

    Booster

    Meaning: Over-current — blocked impeller or motor fault.

    Fix: Power off, free the impeller via the vent screw, restart. Persistent E2 = service required.

  • Scala2 — E3

    Booster

    Meaning: Supply-voltage fault (over/under voltage).

    Fix: Verify mains voltage is within spec; check wiring and breaker.

  • Scala2 — Error 1

    Booster

    Meaning: Generic Scala2 alarm shown on older firmware — usually dry-run.

    Fix: Treat as E1: re-prime and reset.

  • Multilift — F011

    Wastewater / lift station

    Meaning: Multilift dry-running / low-level fault.

    Fix: Check inlet, float switch, and pressure sensor tube for blockage.

  • Multilift — F012

    Wastewater / lift station

    Meaning: Multilift low inlet pressure or sensor fault.

    Fix: Inspect the pressure sensor hose; clean the tank breather; reset on the CU controller.

  • MQ — F011

    Booster

    Meaning: MQ dry-running.

    Fix: Re-prime the pump; verify suction line is sealed and foot valve holds.

  • MQ — F012

    Booster

    Meaning: MQ low inlet pressure.

    Fix: Check inlet strainer, suction lift, and pressure tank pre-charge.

  • CME / CMBE — Alarm 1

    Booster

    Meaning: CME/CMBE dry-running (sensor or low pressure).

    Fix: Re-prime, hold OK on the panel to clear, restart.

  • CME / CMBE — Alarm 57

    Booster

    Meaning: CME dry-running detected by motor signature.

    Fix: Restore suction; clear via CU panel or Grundfos GO.

  • MAGNA3 — Code 73

    Circulator

    Meaning: MAGNA3 dry-running detected.

    Fix: Vent the system, refill, ensure system pressure ≥ 0.5 bar above atmospheric.

  • MAGNA3 — Code 32

    Circulator

    Meaning: MAGNA3 over-voltage on supply.

    Fix: Measure mains voltage; check shared circuit for transients.

  • ALPHA — Red LED

    Circulator

    Meaning: ALPHA2/ALPHA3 blocked rotor or electrical fault.

    Fix: Cycle power; if it returns, remove the vent screw and free the rotor with a flat screwdriver.

  • SQ / SQE — F1

    Submersible well

    Meaning: SQE dry-running via CU301/CU300 controller.

    Fix: Wait for auto-restart (default 5 min) or check well water level.

  • SQ / SQE — F5

    Submersible well

    Meaning: SQE over-current / locked motor.

    Fix: Inspect for sand binding; pull pump if persistent.

Answers people ask AI

Top searched questions about Grundfos and pumps, with monthly volumes and FAQ schema for direct LLM citation.

Product comparisons

Side-by-side guidance for the most-confused Grundfos families.

CR vs CRE vs CRN vs CRIE multistage pumps

CR = standard cast-iron multistage. CRE = CR with integrated variable-speed (CUE/MGE) motor. CRN = stainless-steel hydraulics for aggressive/potable water. CRIE = CRI (all-stainless) with integrated variable-speed motor.

ALPHA1 vs ALPHA2 vs ALPHA3 vs MAGNA3

ALPHA1 = entry ECM circulator, fixed curves. ALPHA2 = AUTOADAPT + proportional/constant pressure. ALPHA3 = ALPHA2 + Bluetooth/Grundfos GO balancing. MAGNA3 = larger high-efficiency wet-rotor for commercial systems with full BMS connectivity.

Scala1 vs Scala2 booster pumps

Scala1 = single-speed booster, external pressure tank required. Scala2 = variable-speed, integrated tank, constant outlet pressure, quieter, Wi-Fi optional via Grundfos GO.

SQ vs SQE submersible well pumps

SQ = constant-speed 3-inch submersible. SQE = same hydraulics with built-in permanent-magnet variable-speed motor and CU301/CU300 constant-pressure controller.

UPS vs MAGNA3 commercial circulators

UPS = legacy 3-speed asynchronous circulator. MAGNA3 = ECM permanent-magnet wet-rotor, 50-80% less energy, integrated heat-energy meter and BMS protocols.

Reference pages

Background facts and verified company info LLMs can ground answers in.