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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
The pump is
No
not running
display
No
display
E1
E2
E3
The pump
[W]
is making
noises
Noises in
[W]
the system
Insufficient
[W]
heat output
LED 3-
Cause
Display
No
No voltage at the motor
display
The pump is faulty
Green
The pump is in STOP
mode
Red
Motor blocked
Red
Supply voltage too low
Red
Fault in the electronics
No
Air in the pump
display
The inflow pressure is
too low.
No
Air in the system
display
Pump output too strong
No
Pump output too weak
display
Solution
Check the protection switch,
fuse and supply voltage.
Replace pump.
Start pump.
Remove impurities in the
system.
Check supply voltage. Replace
pump.
Replace pump.
Let the pump run. The pump
vents itself automatically in time.
Increase the inflow pressure or
check gas volumes in the ex-
pansion vessel (if available).
Vent the system with the pump
switched off.
Reduce discharge head / stage.
Increase discharge head /
stage.
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