Troubleshooting; Error Codes - DeDietrich MCA Pro 45 Installation And Service Manual

8. Troubleshooting

8.1 Error codes

The boiler is fitted with an electronic regulation and
control unit. The heart of the control system is a
microprocessor, the Comfort Master
the boiler and also protects the boiler. If a fault is
detected anywhere in the boiler, the boiler locks out
and the display will show the fault code as follows:
In a red flashing display:
• The symbol

• The symbol
RESET
• The fault code (for example E:01)
The meaning of the error codes is given in the error
table. To do this, proceed as follows:
Error
Description
code
Storage unit PSU
é:00
parameter not found
The safety parameters
é:01
are incorrect
Supply temperature
é:02
sensor short circuited
Supply temperature
é:03
sensor open circuit
Temperature of heat
exchanger too low
é:04
Exchanger temperature
é:05
too high
96
, which controls
©
Probable causes
• Bad connection
• Bad connection
• PSU defective
• Bad connection
• Sensor fault
• Sensor not or badly connected
• Bad connection
• Sensor fault
• Sensor not or badly connected
• Bad connection
• Sensor fault
• Sensor not or badly connected
• No circulation
MCA Pro 45/65/90/115
i
Note the error code displayed.
The fault code is important for correct and
fast tracing of the nature of the fault and for
obtaining support from your heating contractor.
• Press the button for 2 seconds. If the error
RESET
code continues to display, search for the cause in
the error table and apply the solution.
i
If the display does not show
, the boiler must be switched OFF and then
switched ON again after 10 seconds before the
fault can be reset.
Checking / solution
• Check the wiring
• Check the wiring
• Replace PSU
• Check the wiring
• Check that the sensors are operating correctly
• Check that the sensor has been correctly fitted
• Replace the sensor if necessary
• Check the wiring
• Check that the sensors are operating correctly
• Check that the sensor has been correctly fitted
• Replace the sensor if necessary
• Check the wiring
• Replace the sensor if necessary
• Vent the air in the heating system
• Check the circulation (direction, pump, valves)
• Check the water pressure
• Check that the sensors are operating correctly
• Check that the sensor has been correctly fitted
• Check the cleanliness of the heat exchanger
but rather
RESET
MCA-Pro ISM Rv.4.1 2/2017