-11-
Troubleshooting the error codes:
Listed below are potential diagnostic error codes which will appear on the LED display in case of a malfunction.
Unlocking Procedure:
A red LED indicates the circulator is locked or sticking. Disconnect and connect power supply to start
the automatic release process. The circulator makes 100 attempts to restart (process lasts approximately 15 minutes). Every
restart is signaled by a short white flash of the LED. If the locking is not removed through the automatic release process after
100 attempts to restart the circulator, it goes into standby and the LED remains red. In this case follow the manual procedure
described in the next steps: during any attempt, the red LED keeps blinking; after that the circulator tries again to start. If the
locking is not removed through the automatic release process (the warning light returns to red), perform the manual steps
described below.
1. Disconnect power supply - the warning light switches off.
2. Close both isolating valves and allow cooling. If there are no shut-off devices, drain the system so that the fluid level is beneath that of the circulator.
3. Loosen 4 motor bolts. Remove motor from casing. Carefully pull the rotor/impeller from the motor.
4. Remove impurities and deposits from the impeller and casing.
5. Reinsert the rotor/impeller into the motor.
6. Connect power supply. Check for impeller rotation.
7. If the circulator still doesn’t run it will need to be replaced.
FAULTS
CONTROL
PANEL
CAUSE
S
E
I
D
E
M
E
R
S
The circulator is noisy
LED on
Suction pressure is
insufficient - cavitation
Increase the system suction pressure
within the permissible range.
LED on
Presence of foreign bodies
in the impeller
Disassemble the motor and clean the impeller.
Loud noises of water circulation
Flashing white
LED
Air in the system. Circulator
may be air-bound.
Vent the system.
Repeat fill and purge steps.
Circulator is not running although
the electrical power supply is
switched on
LED off
Lack of power supply
Verify voltage value of the electric plant.
Verify the connection of the motor.
Circuit breaker might be
tripped
Check circuit breaker at panel
and reset if necessary.
The circulator is defective
Replace the circulator.
Overheating
Let the circulator cool down for some minutes.
Then try to restart it. Verify that the water
and ambient temperature are within the
indicated temperature ranges.
LED red
The rotor is blocked
Disassemble the motor and clean the impeller.
See unlocking procedure below.
Insufficient supply voltage
Verify that the power supply matches
the data on the name plate.
Building does not get warm
LED on
System may be air-bound
Vent system.
Repeat fill and purge steps.
H
ead [f
t.]
PWM (Pulse Width Modulation)
2
4
6
8
0
0
6
8
2
4
10
16
12
14
20
22
18
26
28
30
32
24
34
36
10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
54
52
Flow Rate Q [GPM]
0034e High-Efficiency Circulator
0-10V DC Performance Curves
100%
75%
50%
25%
0%
0-10V
4V
2V
8V
6V
10V
4
2
0
20
0
40
60
80
100
120
140
160
180
10
6
8
16 18
12 14
20 22 24 26 28 30 32 34 36 38 40
44 46 48
42
50
54
52
Flow Rate Q [GPM]
Power Consumption
0034e High-Efficiency Circulator
0-10V DC Curves
0-10V
Po
w
er
(W
)
2V
4V
6V
8V
10V
