46
Nr.
No. on the PC
Cause
Troubleshooting
A10
10
Internal error
Replace the Slave card.
A11
11
Internal software error
Press the rest button.
A12
12
Internal error
Replace the Slave card.
A16
16
The limit thermostat contact is
open with the burner off
Connector disconnected or defective.
Limit thermostat defective.
A17
17
Delivery sensor error due to
exceeding the limit temp.
Check that the flow rate in each unit’s water circuit is
sufficient.
A18
18
Return sensor error due to
exceeding the limit temp.
Check that the flow rate in each unit’s water circuit is
sufficient.
A19
19
Flue gas sensor tripped for
overtemperature > 80°C (fan
operates at maximum speed)
Heat exchange insufficient on the flue gas side inside
the exchanger.
Clean the flue gas side exchanger.
A20
20
The flame goes out too late
after the gas valve closes
Check the proper operation of the gas valve.
Replace the gas valve.
A21
21
Internal error
Replace the Slave card.
A22
22
The slave board has gener-
ated a type "E” error for more
than 24 hours
Check the history of "E" type errors
A23
23
Internal clock error
It is an error inside the clock.
Can be caused by a transient power failure.
Perform a manual reset to restore functioning.
A24
24
Fan error
The measured fan speed varies too much with the
read speed.
Check the fan.
Check the fan's electrical connection.
Replace the fan.
A25
21
Internal error
Replace the Slave card
Nr.
No. on the PC
Cause
Troubleshooting
E33
33
Line and neutral inverted
Restore the correct line-neutral electrical connection
E34
34
Reset button error.
It was pressed more than 7
times in 30 min.
Wait for the error to disappear.
If the error did not disappear after max 40 min, replace
the Slave card.
E35
35
Water differential pressure
switch error
(contact open)
Check that the flow rate in each unit’s water circuit is
sufficient.
Replace the water pressure switch (tar.500 lt/h).
E36
36
Internal error
Replace the Slave card.
E37
37
Flame detection error
Clean the electrodes.
Replace the electrode.
E38
38
Flue gas sensor short circu-
iting
Check the flue gas sensor connector.
Replace the flue gas sensor.
E39
39
Flue gas sensor with contact
open
Check the flue gas sensor connector.
Replace the flue gas sensor.
E40
40
The frequency is not 50 Hz
Check the frequency of the electrical network
E41
41
Internal error
Replace the Slave card.
E42
42
Flow sensor in short circuit
Check the delivery sensor connector.
Replace the delivery sensor.
E43
43
Delivery sensor with contact
open
Check the delivery sensor connector.
Replace the delivery sensor.
E44
44
Return sensor short circuiting Check the return sensor connector.
Replace the return sensor.
E45
45
Return sensor with contact
open
Check the return sensor connector.
Replace the return sensor.
E46
46
Delivery sensor error due to
exceeding the limit temp.
Check that the flow rate in each unit’s water circuit is
sufficient.
E47
47
Return sensor error due to
exceeding the limit temp.
Check that the flow rate in each unit’s water circuit is
sufficient.
E48
48
Flue gas sensor error due to
exceeding the limit temp. (fan
turns at max with this error).
Check that the flow rate in each unit’s water circuit is
sufficient.
Clean the water side and flue gas side exchanger.
E49
49
Insufficient or absent earth
connection.
Check the earth connection.
Replace the Slave card.