Breakdown Codes - DeDietrich MCR 24 Technical Instructions

1 Alarm code
In the event of a breakdown, the symbol
are displayed.
Alarm Description
code
Outlet or return
E0
sensor error
Flow temperature >
E1
Maximum operating
temperature
Return temperature
E2
> Flow temperature
*When the sensors have been removed, replace the sensors a maximum of 40 mm from the thermal exchanger of the copper pipes.
Operating diagrams: Temperature sensor/Resistance
Resistance in ohm
Temperature (°C)
Temperature sensor/Resistance-Operating diagrams
54
and a flashing code
Probable causes
Short circuit
Faulty sensor
Sensor not or badly connected
The water level and/or pressure are
too low
No circulation
Too much air
Deviation of the outlet or return
temperature sensor
The water level and/or pressure are
too low
No circulation
Too much air
Sensor not or badly connected
Deviation of the outlet or return
temperature sensor
MCR 24, 24/28 MI, 30/35 MI, 34/39 MI

Breakdown codes

Press key
screen, look for the nature of the error.
Check the wiring. Replace the protection caps. If a faulty sensor is detected, it is possible to
check the resistance at the various temperatures using a meauring device with a
corresponing measurement range (e.g. a multimeter)
Check that the sensors are operating correctly. If a faulty sensor is detected, it is possible to
check the resistance at the various temperatures using a meauring device with a
corresponing measurement range (e.g. a multimeter)* (20 to 25 °C). sensor resistance
values: 12 to 15 kOhm.
Check the water pressure in the installation (Pressure gauge)
Check that the boiler circulating pump is working. Insert a screwdriver into the slot in the
pump spindle and turn the spindle several times to the right and left. Check the wiring. If the
pump still does not work, it is faulty and must be changed.
When the pump is switched off, vent the system
Check that the sensors are operating correctly. If a faulty sensor is detected, it is possible to
check the resistance at the various temperatures using a meauring device with a
corresponing measurement range (e.g. a multimeter)* (20 to 25 °C). sensor resistance
values: 12 to 15 kOhm.
Check the water pressure in the installation (Pressure gauge)
Check that the boiler circulating pump is working. Insert a screwdriver into the slot in the
pump spindle and turn the spindle several times to the right and left. Check the wiring. If the
pump still does not work, it is faulty and must be changed.
When the pump is switched off, vent the system
Check the wiring between the sensors and the control panel
Check that the sensors are operating correctly. If a faulty sensor is detected, it is possible to
check the resistance at the various temperatures using a meauring device with a
corresponing measurement range (e.g. a multimeter)* (20 to 25 °C). sensor resistance
values: 12 to 15 kOhm.
for 2 seconds. If the error code remains on the
Checks/Solution
08/06/06-300008460-001-B