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9 Fault summary and checklist
Warning
Before starting to rectify faults, it is vital that the pump is taken out of operation,
and it must be removed from the mains at all poles and safe guarded from being
switched on again. This should only be carried out by specialist staff.
Warning
Accessible voltage!
Warning
Risk of scalding from escaping medium.
Warning
Risk of burning from hot surfaces.
The list below should be followed step by step from top to bottom.
Fault LED 4-
Display
LED 3-
Display
Cause Solution
The pump is
not running
No
display
No
display
No voltage at the motor Check the protection switch,
fuse and supply voltage.
The pump is faulty Replace pump.
No
display
Green The pump is in STOP
mode
Start pump.
E1 Red Motor blocked Remove impurities in the
system.
E2 Red Supply voltage too low Check supply voltage. Replace
pump.
E3 Red Fault in the electronics Replace pump.
The pump
is making
noises
[W] No
display
Air in the pump Let the pump run. The pump
vents itself automatically in time.
The inflow pressure is
too low.
Increase the inflow pressure or
check gas volumes in the ex-
pansion vessel (if available).
Noises in
the system
[W] No
display
Air in the system Vent the system with the pump
switched off.
Pump output too strong Reduce discharge head / stage.
Insufficient
heat output
[W] No
display
Pump output too weak Increase discharge head /
stage.
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