28 - IE
INSTALLERUSER
MAINTENANCE TECHNICIAN
For example, if these values are
read on the display it means
that the appliance is in ignition
3.5 FUNCTIONING ANOMALIES WITH ELECTRIC REARM.
For example, if these values
are read on the display it
means that the appliance
has a temperature dierence
(∆t) between system ow and return greater
than 40°C. e blocks are temporary and the
boiler rearms automatically when the anomaly
disappears.
N.B.: maintenance interventions must be carried
out by a qualified technician (e.g. Immergas
Aer-Sales Technical Assistance Service).
- Smell of gas. Caused by leakage from gas circuit
pipelines. Check sealing eciency of gas intake
circuit.
- Irregular combustion or noisiness. is may be
caused by: a dirty burner, incorrect combustion
parameters, intake-exhaust terminal not
correctly installed. Clean the above components
and ensure correct installation of the terminal,
check correct setting of the gas valve (O-Set
setting) and correct percentage of CO
2
in ue
gases.
- Siphon blocked. is 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
ow of condensate.
- Heat exchanger blocked. is may be caused
by the trap being blocked. Check, by means of
the condensate drain cap, (accessible only aer
the casing front has been removed) that there
are no residues of material blocking the ow of
condensate.
E 02
Code Description Remedy
b 18 System ow 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 ow return probes Check probes position
b 25 Increase of the system ow temperature too quick Check the circulation of water in the system
b 26 No water/Water pressure insucient
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 dierence between system ow 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 (insucient air ow rate) Check fan functioning
b 118
Ionisation current loss during burner ignition (aer 3 attempts
becomes "02" error ignition block)
Check presence of gas and electric power supply
Check the gas supply pressure
E 12 over-temperature safety thermostat intervention or ue safety thermostat intervention
Check water overheating thermostat
Check ue safety thermostat
E 13 Error detected in P.C.B. output
Check P.C.B.
Replace the P.C.B.
E 14 Block in the ow probe control circuit
Check delivery probe/P.C.B.
Replace the P.C.B.
E 18 System ow 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 ow temperature too quick
Check the circulation of water in the system
Check main exchanger
E 30 Temperature dierence between system ow and return too great Check the circulation of water in the system
E 31 System ow probe anomaly (short circuit) Replace system ow probe
E 32 System return probe anomaly (short circuit) Replace system return probe
E 36 System ow probe anomaly (open) Replace system ow probe
E 37 System return probe anomaly (open) Replace system return probe
E 114 Cascade address not valid
Check address set on the board (See cascade and zone
regulator assistance board)
FUSE 24 Vac missing Check the external transformer. Check P.C.B.
block conditions. To eliminate the block, press
the RESET button positioned on the boiler panel.