Technical data

54
MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B
Breakdown codes
1 Alarm code
In the event of a breakdown, the symbol m and a flashing code
are displayed.
Press key  for 2 seconds. If the error code remains on the
screen, look for the nature of the error.
*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
Alarm
code
Description Probable causes Checks/Solution
E0
Outlet or return
sensor error
Short circuit
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)
Faulty sensor
Sensor not or badly connected
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.
E1
Flow temperature >
Maximum operating
temperature
The water level and/or pressure are
too low
Check the water pressure in the installation (Pressure gauge)
No circulation
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.
Too much air When the pump is switched off, vent the system
Deviation of the outlet or return
temperature sensor
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.
E2
Return temperature
> Flow temperature
The water level and/or pressure are
too low
Check the water pressure in the installation (Pressure gauge)
No circulation
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.
Too much air When the pump is switched off, vent the system
Sensor not or badly connected Check the wiring between the sensors and the control panel
Deviation of the outlet or return
temperature sensor
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.