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8. Troubleshooting the error codes: Listed below are potential diagnostic error codes which will appear on
the LED display in case of a malfunction.
FAULTS
CONTROL PANEL
LED on
The circulator
is noisy
LED on
Loud noises of
Flashing
water circulation
white LED
LED off
Circulator is
not running although
the electrical
power supply
is switched on
LED red
Building does
LED on
not get warm.
9. Unlocking Procedure: A red LED indicates the circulator is locked or sticking. Disconnect and connect power sup-
ply 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 LED light. 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 light 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 be 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
CAUSES
Suction pressure is
insufficient — cavitation
Presence of foreign bodies
in the impeller
Air in the system.
Pump may be air-bound
Lack of power supply
Circuit breaker might
be tripped
The circulator is defective
Overheating
The rotor is blocked
Insufficient supply voltage
System may be air-bound
-8-
REMEDIES
Increase the system suction
pressure within the
permissible range.
Disassemble the motor
and clean the impeller.
Vent the system. Repeat
fill and purge steps.
Verify voltage value of the
electric plant. Verify the
connection of the motor.
Check circuit breaker at panel
and reset if necessary.
Replace the pump.
Let the pump cool down for
some minutes. Then try to restart
it. Verify that the water and ambient
temperature are
within the indicated
temperature ranges.
Disassemble the motor and
clean the impeller. See
unlocking procedure below.
Verify that the power supply
matches the data on the
name plate.
Vent system.
Repeat fill and purge steps.
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