Grundfos UPM3 Instructions Manual page 27

HYBRID, AUTO,
AUTO2, DHW,
FLEX AS, SOLAR
ON
230 V
ON
<160 V
ON
230 V
52
FAULT OPERATING PANEL REMEDY
1/On
B
A
0/Off
1/On
2
1
0/Off
1
1/On
2
1
0/Off
C
?
PWM
SYSTEM
CONTROLLER
3
5 mm
No.2
3
53