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VENUS BA MS 24- 34
4.4 Troubleshooting
Diagnostics
In case of operation faults or problems, the display flashes and the fault identification
code appears.
There are faults that cause permanent shutdown (marked with the letter "A"): to restore
operation just press the reset button (detail 6 - fig. 1) for 1 second or RESET on the op-
tional remote timer control if installed; if the boiler fails to start, it is necessary to firstly
eliminate the fault.
Faults marked with the letter "F" cause temporary shutdowns that are automatically reset
as soon as the value returns within the boiler's normal working range.
Table of faults
Table. 10 - List of faults
Fault code Fault
Possible cause
No gas
Ignition/detection electrode fault
A01
No burner ignition
Faulty gas valve
Insufficient gas supply pressure
Trap blocked
Electrode fault
Flame present signal
A02
with burner off
Card fault
Heating sensor damaged
Overtemperature
A03
protection intervention
No water circulation in the system Check the circulating pump
Air in the system
Fume extraction duct
Fault F07 generated 3 times in the
A04
safety device
last 24 hours
intervention
Fault F15 generated for 1 hour
A05
Fan protection activated
(consecutive)
Ionization electrode fault
Flame unstable
Gas valve Offset fault
No flame after ignition
A06
stage (6 times in
4 minutes)
air/fume ducts obstructed
Trap blocked
The fume probe detects an
F07
High fume temperature
excessive temperature
Sensor damaged
F10
Delivery sensor 1 fault
Wiring shorted
Wiring disconnected
Sensor damaged
F11
Return sensor fault
Wiring shorted
Wiring disconnected
Sensor damaged
F12
DHW sensor fault
Wiring shorted
Wiring disconnected
Probe damaged
F13
Fume probe fault
Wiring shorted
Wiring disconnected
Sensor damaged
F14
Delivery sensor 2 fault
Wiring shorted
Wiring disconnected
No 230V power supply
F15
Fan fault
Tachometric signal interrupted
Fan damaged
Supply voltage under
F34
Electric mains trouble
170V
F35
Faulty mains frequency Electric mains trouble
Pressure too low
Incorrect system water
F37
Water pressure switch damaged
pressure
or not connected
Probe damaged or wiring shorted Check the wiring or replace the sensor
F39
External probe fault
Probe disconnected after
activating the sliding temperature
A41
Heating sensor detached from
Sensor positioning
A44
pipe
A42
Heating sensor fault
Sensor damaged
Fault code Fault
Cure
Check the regular gas flow to the
boiler and that the air has been
eliminated from the pipes
Check the wiring of the electrode and
that it is correctly positioned and free
of any deposits
Check the gas valve and replace it if
necessary
5. TECHNICAL DATA AND CHARACTERISTICS
Check the gas supply pressure
Check the trap and clean it if necessary
Table. 11 - Legend - figures cap. 5
Check the ionization electrode wiring
Check the card
Check the correct positioning and
operation of the heating sensor
10 System delivery - Ø 3/4"
Vent the system
11 System return - Ø 3/4"
See fault F07
14 Pressure relief valve
16 Fan
32 Heating circulating pump
See fault F15
36 Automatic air vent
Check the position of the ionization
37 Cold water inlet filter
electrode and replace it if necessary
39 Flow regulator
Check the burner
42 DHW temperature probe
Check the Offset adjustment at
44 Gas valve
minimum power
56 Expansion tank
Remove the obstruction from the flue,
72 Room thermostat (not supplied)
fume extraction ducts and air inlet
and terminals
74 System filling valve
Check the trap and clean it if
81 Ionization/ignition electrode
necessary
95 Diverter valve
Check the exchanger
Check the wiring or replace the sensor
Check the wiring or replace the sensor
Check the wiring or replace the sensor
Check the wiring or replace the fume
probe
Check the wiring or replace the sen-
sor
Check the 3-pin connector wiring
Check the 4-pin connector wiring
Check the fan
Check the electrical system
Check the electrical system
Fill the system
Check the sensor
Reconnect the external probe or
disable the sliding temperature
Check the correct positioning and
operation of the heating sensor
Replace the sensor
cod. 3541I710 - Rev. 00 - 06/2016
Possible cause
No system H
Exchanger protection
F43
intervention.
Air in the system
F52
Heating sensor fault
Sensor damaged
Controller fault
A61
Controller internal error ABM03D
ABM03D
No communication
Controller not connected
A62
between controller and
gas valve
Valve damaged
A63
F64
Controller fault
Controller internal error ABM03D
A65
ABM03D
F66
A23
A24
F20
F21
Card parameter fault
Wrong card parameter setting
A26
F40
F47
7 Gas inlet - Ø 1/2"
8 DHW outlet - Ø 1/2"
9 DHW inlet - Ø 1/2"
Cure
O circulation
Check the circulating pump
2
Vent the system
Replace the sensor
Check the ground connection and
replace the controller if necessary.
Connect the controller to the gas
valve
Replace the valve
Check the ground connection and
replace the controller if necessary.
Check the card parameter and
modify it if necessary.
104 Fuse
114 Water pressure switch
136 Flow meter
138 External probe (optional)
139 Remote timer control (optional)
169 Noise filter
186 Return sensor
191 Fume temperature sensor
193 Trap
194 DHW exchanger
196 Condensate tray
241 Automatic bypass
256 Modulating heating circulating pump signal
278 Double sensor (Safety + Heating)
350 Fan/Burner assembly
A ON/OFF switch (configurable)
EN
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