Pump Control; Performance Display; Fault Display - Grundfos UPM3 Instruction Manual

1. Introduction
The circulation pump can be externally controlled by a PWM A signal (profile for use in heating systems) or
PWM C (profile for use in solar thermal systems), or without a PWM signal (proportional pressure, constant
pressure, constant speed).

2. Pump control

When switched on, the pump runs at a default setting or at the last setting. The display shows its momentary
performance.
WARNING: LEDs may be turned by 180° - this depends on the specific pump type.

Performance display

* only when the pump is controlled by a PWM signal.

Fault display

6
seized pump
too low power supply voltage
electric fault