DeDietrich MPX 24 COMPACT - ADJUSTING MAXIMUM HEATING POWER; TROUBLESHOOTING SERVICE FAULTS

15
INSTALLER Section (en)
7679433.01 (3-06/17)
14.1 ADJUSTING MAXIMUM HEATING POWER
The maximum heating power of the boiler can be reduced to suit the requirements of the heating system it serves. A table showing
parameter P13 values according to the desired maximum power model is shown below for each single boiler
To access and edit parameter P13 values, proceed as described in the PARAMETER SETTINGS section.
Boiler model - PARAMETER P13 (%) / Heating output (kW)
kW 24 20/24 MI 24/28 MI 28/33 MI
3,5 0 0
4 2 2 0
5 7 7 4 0
6 12 12 8 4
7 17 17 13 7
8 22 22 17 11
9 27 27 21 14
10 32 32 25 18
12 41 41 33 25
14 51 51 42 32
16 61 61 50 39
18 71 71 58 46
20 80 80 67 54
22 90 75 61
24 100 86 68
26 75
28 80
15. TROUBLESHOOTING SERVICE FAULTS
The faults shown on the display are identied with the symbol and a number (fault code). For a complete list of faults, see the
following table.
If appears on the display the fault must be RESET by the user.
To RESET the boiler, press and hold down for 2 seconds. If faults are displayed frequently, call the Authorised Service Centre.
Description of fault Service action
09
Gas valve connection error
Check the connections between the gas valve and the
electronic board.
10
External probe sensor faulty Check the sensor (*).
12
Hydraulic differential pressure switch switching failure Check correct operation of the pressure switch and the wiring.
13
Hydraulic differential pressure switch contacts stuck See the actions indicated in E12
15
Gas valve control error
Check the connections between the gas valve and the
electronic board. If necessary, replace the electronic board.
18
Hydraulic circuit automatic lling in progress Wait for the end of the lling cycle.
19
Fault in system lling phase Check the lling tap.
20
NTC ow sensor faulty
Check the sensor (**).
Check the continuity of the probe wiring.
Make sure the wiring has not shorted.
28
NTC fumes sensor faulty
Check the fumes NTC probe (***).
Check the continuity of the probe wiring.
Make sure the wiring has not shorted.
40
NTC return sensor faulty See the actions indicated in E20
50
NTC domestic hot water sensor faulty (only for heating-only
model with storage boiler)
See the actions indicated in E20
53
Fumes outlet obstructed
Check that the drainage pipe is free from obstructions.
Switch off the electric power supply to the boiler for a few
seconds.
55
Electronic board not calibrated
Activate the automatic calibration function described in the
spare parts instructions sheet.
83…87
Communication problem between boiler board and control unit.
Probable short circuit on wiring.
Check the wiring between the Ambient Unit and the electronic
board or RF link.