34
11 ERROR LIST
A and E type errors possibly encountered with
Power Plus Box P INT-EXT
are given in the tables below.
In this sense it should be specified that an E-type error (volatile error) is a fault which automatically disappears as soon
as the fault is resolved; whilst A type (non-volatile error) is a fault that will only disappear after resetting manually when
the problem has been resolved.
11.1 Master board errors
Nr. No. on the PC Cause Troubleshooting
A16 10 Internal error Replace the Master card
A18 12 Internal error Replace the Master card
A20 14 Internal error Replace the Master card
Nr. No. on the PC Cause Troubleshooting
E02 51
NTC1 open (NTC1: delivery
sensor)
Primary delivery sensor not connected or interrupted.
E04 53
NTC3 open (NTC3: boiler
sensor)
DHW sensor not connected or interrupted.
E18 67
NTC1 short circuiting (NTC1:
delivery sensor)
Primary circuit delivery sensor short circuit.
E20 69
NTC3 short circuiting (NTC3:
boiler sensor)
DHW sensor short circuiting.
E23 28 Internal error Replace the Master card
E24 29 Internal error Replace the Master card
E25 0/30 Internal error Replace the Master card
E26 31 Internal error Replace the Master card
E32 33 Slaves not present
Check that the bipolar switches of the individual units
are “ON”.
Check the addresses on the slave.
Check the slave BUS connection.
Replace the Master card.
Replace the Slave card.
E34 42 Internal 50HZ error The main frequency is not 50Hz
11.2 Slave board errors
Nr. No. on the PC Cause Troubleshooting
A01 1 5 failed ignition attempts
Check that the gas tap is open.
Check for the presence of electric discharge between
the two ignition electrodes.
Check the ignition cable.
Do not open the gas valve.
Replace the electronic card (Slave).
A02 2
Multiple unsuccessful at-
tempts due to flame ionisation
problems
Clean the electrodes.
Replace the igniter plug.
Replace the ignition cable.
A04 4
Water side limit thermostat
(> 90°C) tripping, version
SCHEDA43
Poor circulation in the primary circuit.
Limit thermostat defective.
A05 5
Gas valve coil interrupted. Replace the gas valve.
False gas valve connector
contact.
Check the gas valve connector.
Defective gas valve connec-
tor.
Replace the gas valve connector.
Maximum temperature ther-
mostat tripped (> 90°C) while
burner was on.
Poor circulation in the primary circuit.
Limit thermostat defective.
A06 6
No or bad ground connection.
BOARD 43 only
Check the earth connection.
Replace the Slave card.
A07 7 Internal error Replace the Slave card.
A08 8 Internal error Replace the Slave card.
A09 9 50Hz The main frequency is not 50Hz
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