DeDietrich MPX 24 COMPACT - Page 16

7679433.01 (3-06/17) 16
INSTALLER Section (en)
92
Fumes fault during calibration (probable fumes recirculation)
Check for any recirculation of fumes.
Activate the automatic calibration function described in
the paragraph YEARLY MAINTENANCE – REPLACING
COMPONENTS.
109
Air in boiler circuit (temporary fault)
Check pump operation.
Check the pump power input wiring.
110
Safety thermostat tripped due to overtemperature (pump
probably blocked or air in heating circuit).
Check pump operation.
Check the pump power input wiring
Check that the limit thermostat is undamaged and replace it if
necessary
Check the continuity of the limit thermostat wiring
117
Pressure in hydraulic circuit too high (> 2.7 bar)
Check that the pressure in the system is correct
See the FILLING THE SYSTEM section.
118
Pressure in hydraulic circuit too low
If the pressure in the CH circuit is < 0.5 bar, perform lling (see
the FILLING THE SYSTEM section).
Check the hydraulic pressure switch works correctly
125
No circulation safety trip.
(control performed via a temperature sensor)
See the actions indicated in E109
128
No ame
Check the ame sensing electrode is in good condition
and correctly positioned (see the ANNUAL SERVICING -
POSITIONING THE ELECTRODES section).
Check the wire is uninterrupted and makes good contact with
the ame sensing electrode and the ignition switch.
See the actions indicated in E92
129
Loss of ame at ignition
Check the ame sensing electrode is in good condition
and correctly positioned (see the ANNUAL SERVICING -
POSITIONING THE ELECTRODES section).
Check the wire is uninterrupted and makes good contact with
the ame sensing electrode and the ignition switch.
Check for any recirculation of fumes.
130
Fumes NTC tripped due to overtemperature
Check the heat exchange level of the water-fumes exchanger:
possible insufcient circulation or presence of scale.
Check the fumes NTC probe (***).
133
Ignition failure (5 attempts)
Check that the gas valve is open and there is no air in the gas
supply circuit.
Check the gas supply pressure.
Check the wire is uninterrupted and makes good contact with
the ame sensing electrode and the ignition switch.
See the actions indicated in E92
Check correct operation of the condensate drainage.
134
Gas valve blocked
Check the gas supply pressure.
Check the integrity and position of the sensing and ignition
electrodes and their wiring (see the ANNUAL SERVICING -
POSITIONING THE ELECTRODES section).
If necessary, replace the electronic board.
135
Internal board error Replace the electronic board.
154
Delivery/return probe control test See the actions indicated in E109
160
Fan fault
Check correct operation of the fan.
Check that the fan power supply wiring is connected to the
electronic board.
178
Intervention of safety thermostat for excess temperature in low
temperature system
Check correct operation of the pump and the water circulation
in the low temperature system.
Check the pump power input wiring.
317 162
Incorrect power supply frequency
Check whether the incorrect electric power supply frequency
is due to causes outside the boiler, in which case contact the
power supply company.
321 163
NTC domestic hot water sensor faulty See the actions indicated in E20
384 164
Parasite ame (internal error) Check correct operation of the gas valve.
385 165
Input voltage too low
Input voltage V<175V.
Check whether the power supply reductions are due to
reasons other than the boiler. If so, contact the electricity
provider.
CH = central heating.
(*) External Sensor: cold resistance value: approximately 1 kΩ @ 25° C
(resistance decreases as temperature rises).
(**) NTC delivery, return and DHW sensor: cold resistance value: approximately 10 kΩ @ 25° C (resistance decreases as temperature rises).
(***) NTC fumes probe: cold resistance value: approximately 20 kΩ @ 25° C (resistance decreases as temperature rises).
In the event of a fault, the display backlighting indicates the error code. 5 reset attempts can be performed after which the
boiler shuts down. Wait 15 minutes before attempting to reset the boiler again.