D
48
GB
TROUBLESHOOTING
TABLE OF PROBLEMS AND SOLUTIONS
Effect
After the general switch-on, the alarm
FL
will appear on the display of the controller.
(first intervention rearms automatically;
then manually thereafter)
There are unusual noises or vibrations
coming from the hydraulic circuit
Alarm
Lo
appears (first intervention
rearms automatically; then manually
thereafter)
Alarm
E1
appears (automatic re-arm)
Alarm
E2
appears (automatic re-arm)
Alarm
E3
appears (automatic re-arm)
Alarm
hi
appears (automatic re-arm)
Cause
The water does not circulate well in the
system.
There is air inside the circuit.
The anti-freeze minimum temperature
alarm has intervened.
The outlet water temperature has fallen
below 5 °C.
The inlet water temperature probe is faulty
or not correctly connected
The probe that measures the temperature
positioned within the domestic boiler (to
be connected to clamps 1-2) is faulty or is
not connected correctly.
The antifreeze/outlet water temperature
probe is faulty or not correctly connected
The inlet water temperature has exceeded
80°C.
Solution
Check that: the interception valves are
open, that the 3-way valve for the hot-cold
deviation is in the correct position, that
there are no air bubbles in the circuit,
that at least one of the user-units has the
circuit open or is fitted with a three-way
valve, that the external sieve filter is not
blocked, that the water pressure in the
system is correct, that the circulation
pump is working correctly (unblock if
necessary)
Bleed the air both with the external units
and the vent on the machine inertial tank
and return the circuit to the correct load
pressure.
Check that the suction pressure
(hydraulic circuit return) is more than 0.6
BAR with the pump ON.
Check that there is nothing that could
prevent proper circulation of the water
within the system (air, partially closed
valve, external sieve filter clogged etc).
Check that the thermal difference between
the system inlet and outlet is between 4-
7°C
- checking the parameters
t1
and
t3
with
the
key (see paragraph 3.3.1).
If the thermal difference is less than 4°C
set a lower speed for the circulator. If, on
the contrary, the difference is greater than
7°C check that all of the valves present
on the system are open and possibly add
an external pump in order to increase the
water flow.
Check the connection and if necessary
replace the probe
Check the connection and if necessary
replace the probe
Check the connection and if necessary
replace the probe
If a boiler is installed in the system, check
the system deviator valves
4
4.1
4
