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8.6
Malfunction codes and possible solutions
LIST OF MALFUNCTION/FAULT ALARMS
Type
No.
Fault
Fault in the flame
E
01
detection circuit
Safety thermostat
E
02
intervention
Low water pressure in
E
04
system
Air pressure switch
E
05
intervention
Domestic hot water
E
06
sensor fault
E
07
Delivery sensor fault
No water circulating in
E
09
the system
E
11
Parasite flame fault
Gas valve modulator
E
12
disconnected
Maximum number of
E
28
consecutive resets
reached
Fault due to low
E
37
network voltage
Incorrect network
E
40
frequency detected
Flame loss more than
E
41
6 consecutive times
E
42
Button fault
Open Therm
E
43
communication fault
80
Solution
- Check the integrity of the
electrode and check that it
is not grounded
- Check gas availability and
pressure
- Check the integrity of the
gas valve and the card
- Check the sensor or
thermostat connections
- Deaerate the system
- Check the bleed valve
- Replace the sensor or the
thermostat
- Check that the pump
impeller is not blocked
- Restore pressure
- Check for any leaks in the
system
- Check the air pressure
switch and fan
- Check any blockage of the
silicone pipe between the
fan and the air pressure
switch and check the
correct positioning of the
pipe on pressure switch
point P2
- Check the correct usage
of the segmented air
diaphragm
- Check any blockage of
the flue gas outlet and air
inlet ducts
- Check connections
- Check the sensor is
working
- Check connections
- Check the sensor is
working
- Check the rotation of the
pump rotor
- Check the electrical
connections
- Replace the pump
- Check that the electrode
is intact or that it is not
earthed
- Check the electrical
connection
- Wait 1 hour and try
unblocking the board
again
- Contact the Technical
Assistance Centre
- Check the voltage
- Contact your network
provider
- Contact your network
provider
- Check the ignition/
detection electrode
- Check the gas supply
(open valve)
- Check mains gas pressure
- Check that buttons are
working
- Check the OT electric
connection
Type
No.
Fault
Gas valve timeout fault
E
44
without flame
The ΔT requested at
E
72
start-up has not been
reached
Fault on the gas valve
E
80
control logic line/valve
cable damaged
Internal error (board
E
88
component protection)
888
Over temperature
SW error, board
E
98
start-up
E
99
Generic error
Frequent relief valve
-
-
intervention
Limited production of
-
-
domestic hot water
EN
Solution
- Check gas valve and board
- Check the correct position
of the delivery sensor
- Check the gas valve,
board, electrode and valve
cable
- Check the board is
working
- Replace board
- Check the delivery probe
- Check flue gas outlet
- Check system pump
- Contact the Technical
Assistance Centre
- Contact the Technical
Assistance Centre
- Check circuit pressure
- Check expansion vessel
- Check the diverter valve
- Check that plate heat
exchanger is clean
- Check domestic hot water
circuit valve
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