98
4.5.3.5 Possible pump faults, causes and possible solutions
• Pressing the button for the 9th time returns to
the basic setting (constant speed / characteristic
curve III).
LED display
Control mode
Pump curve
1
Constant speed
II
2
Constant speed
I
3
Variable differential
pressure
Δp-v
III
4
Variable differential
pressure
Δp-v
II
5
Variable differential
pressure
Δp-v
I
6
Constant differential
pressure
Δp-c
III
7
Constant differential
pressure
Δp-c
II
8
Constant differential
pressure
Δp-c
I
9
Constant speed
III
4.5.3.4 Setting the pump operating mode
Variable
differential
pressure
Δp-v
(I, II, III)
Recommended for two-pipe heating systems with radi
-
ators to reduce the flow noise at thermostatic valves.
The pump reduces the delivery head to half in the case of
decreasing volume flow in the pipe network.
Electrical energy saving by adjusting the delivery head to
the volume flow requirement and lower flow rates.
There are three pre-defined pump curves (I, II, III) to
choose from.
Constant
differential
pressure
Δp-c (I, II, III)
Recommended for underfloor heating for large-sized
pipes or all applications without a variable pipe network
curve (e.g. storage charge pumps), as well as single-pipe
heating systems with radiators.
The control keeps the set delivery head constant irre
-
spective of the pumped volume flow.
There are three pre-defined pump curves (I, II, III) to
choose from.
II
III
I
H/m
Q/m³/ h
III
I
II
H/m
Q/m³/ h
Constant
speed (I, II, III)
Recommended for systems with fixed system resistance
requiring a constant volume flow.
The pump runs in three prescribed fixed speed
stages (I, II, III).
I
III
II
H/m
Q/m³/ h
NOTICE
Factory setting:
Constant speed, pump curve III
Colour of LED
Possible fault
Cause
Possible solution
Flashing.
red-green
Turbine.operation
The.hydraulic.system.of.the.pump.is.pow-
ered,.but.the.pump.has.no.mains.voltage
-.Check.the.mains.voltage
Idle.operation
Air.in.the.pump
-.Check.that.there.are.no.leaks.in.the.
system
Overload
The.motor.runs.with.difficulty..The.number.
of.revolutions.is.lower.compared.to.normal
operation
-.Check.the.mains.voltage
-.Check.the.system.flow.rate/pressure
-.Check.the.characteristics.of.the.water.
in.the.system;.remove.debris.from.the.
system
Flashing
red
Under/overvoltage
Supply.voltage.too.low/high
-.Check.the.mains.voltage
Excessive.temperature
Excessive.temperature.inside.the.pump
-.Check.the.water.temperature.level.in.re-
lation.to.that.of.the.ambient.temperature
-.Check.the.mains.voltage
-.Check.the.environmental.operating.
conditions
Short.circuit
Motor.current.too.high
-.Check.the.mains.voltage
Steady
red
“Permanent.lockout”.
stop
Rotor.blocked
- Restart manually
-.REPLACE.THE.PUMP
Circuit.board.and/or.motor.failure
-.REPLACE.THE.PUMP
LED.off
Stopped
Electrical.power.failure
-.Check.the.connection.to.the.power.supply
Faulty.LED
-.Check.to.see.if.the.pump.can.work
Faulty.circuit.board
-.REPLACE.THE.PUMP
