3.5 FUNCTIONING ANOMALIES WITH ELECTRIC REARM.
For example, if these values are
read on the display it means
that the appliance has a tempe-
rature difference (∆t) between
system flow and return greater than 40°C. The
blocks are temporary and the boiler rearms au-
tomatically when the anomaly disappears.
N.B.:
Maintenance must be carried out by a
qualified technician (e.g. Immergas Technical
After-Sales Assistance Service).
- Smell of gas. Caused by leakage from gas circuit
pipelines. Check sealing efficiency of gas intake
circuit.
- Irregular combustion or noisiness. This may be
caused by: a dirty burner, incorrect combustion
P
30
parameters, intake-exhaust terminal not cor-
rectly installed. Clean the above components
and ensure correct installation of the terminal,
check correct setting of the gas valve (Off-Set
setting) and correct percentage of CO
2
in fu-
mes.
- Trap blocked. This may be caused by dirt or
combustion products deposited inside. Check,
by means of the condensate drain cap, that
there are no residues of material blocking the
flow of condensate.
- Heat exchanger blocked. This may be caused
by the trap being blocked. Check, by means of
the condensate drain cap, (accessible only after
the casing front has been removed) that there
are no residues of material blocking the flow of
condensate.
- Noise due to air in the system. Check opening
of the hood of the special air vent valve (Fig.
1-25). Make sure the system pressure and ex-
pansion vessel factory-set pressure values are
within the calculated limits.
N.B.:
In the case of maintenance interventions
on the boiler that lead to the closure of one or
both system cut-off cocks (part. 34 fig. 1-30), the
boiler must be off.
E 18
System flow temperature too high (
over 95 °C
)
Check the circulation of water in the system
E 19
System return temperature too high (
over 87 °C
)
Check the circulation of water in the system
E 25
Increase of the system flow temperature too quick
Check the circulation of water in the system
Check main exchanger
E 30
Temperature difference between system flow and return too great
Check the circulation of water in the system
E 31
System flow probe anomaly (
short circuit
)
Replace system flow probe
E 32
System return probe anomaly (
short circuit
)
Replace system return probe
E 35
Flue probe fault (short circuit)
Replace flue probe
E 36
System flow probe anomaly (
open
)
Replace system flow probe
E 37
System return probe anomaly (
open
)
Replace system return probe
E 40
Flue probe fault (open)
Replace flue probe
E 52
Flue probe fault
Check the integrity of the flue circuit
E 114
Cascade address not valid
Check address set on the board (
See cascade and
zone regulator
)
For example, if these values are
read on the display it means that
the appliance is in ignition block
E
02
conditions. To eliminate the block, press the
RESET button positioned on the boiler panel.
Code “b”
Description
Remedy
b 18
System flow temperature over 92 °C
Check the circulation of water in the system
b 19
System return temperature over 87 °C
Check the circulation of water in the system
b 24
Inverted flow return probes
Check probes position
b 25
Increase of the system flow temperature too quick
Check the circulation of water in the system
b 26
No water/Water pressure insufficient
Check the correct water pressure inside the system
Take the water pressure in the system to a value between 1 and 1.2
bar
Check for any leaks in the circuit
b 28
Fan breakdown (
no Hall signal
)
Check fan
Check fuse “F3”
Check P.C.B.
b 29
Fan fault
Check fan
Check fuse “F3”
Check P.C.B.
b 30
Temperature difference between system flow greater than
40°C
Check the circulation of water in the system
b 33
DHW probe anomaly (
short circuit
)
Check/replace DHW probe
b 38
DHW probe anomaly (
open
)
Check/replace DHW probe
b 65
Fan start stand-by (
insufficient air flow rate
)
Check fan functioning
b 118
Ionisation current loss during burner ignition (
after 3 attempts
becomes “02” error ignition block
)
Check presence of gas and electric power supply
Check the gas supply pressure
137
TR
SI
RU
IE
CZ