Error History; Troubleshooting - DeDietrich AWHP 4 MR User Manual

8 Troubleshooting

8.2

Error history

Fig.53 Accessing the menus
MW-5000009-3
Fig.54 Accessing the Failure menu
8.3 Troubleshooting
Problems Probable causes
The radiators are cold. The heating set point tem­
perature is too low.
The heating mode is deac­
tivated.
The radiator valves are
closed.
The heat pump is not op­
erating.
The water pressure is too
low (< 1 bar).
There is no domestic The domestic hot water
hot water. set point temperature is
too low.
The domestic hot water
mode is deactivated.
The appliance is in re­
duced domestic hot water
mode
The energy-saving shower
head is restricting the wa­
ter flow.
The heat pump is not op­
erating.
The water pressure is too
low (< 1 bar).
Significant variations in Insufficient water supply
domestic hot water
temperature
The domestic hot water
hysteresis is too high
48 MIV-4
1. Access the menu level by pressing the two keys on the right simulta­
neously.
2. Select the Failure menu by pressing the
3. Press the
4. Press the
MW-5000043-1
Corrections
Increase the value of parameter
ted, increase the temperature on it.
Activate the heating mode.
Open the valves on all radiators connected to the heating system.
Check that the heat pump is switched on.
Check the fuses and switches on the electrical installation.
Top up the installation with water.
Increase the value of parameter
Activate the domestic hot water mode.
Check and modify the comfort and reduced time ranges for the domestic
hot water.
Clean the shower head; replace it if necessary.
Check that the heat pump is switched on.
Check the fuses and switches on the electrical installation.
Top up the installation with water.
Check the water pressure in the installation.
Open the valve.
Lower the value of the hysteresis parameter in the installer menu
or key to scroll through the error code history.
key to access the details of the error code displayed.
or, if a room thermostat is connec­
.
key.
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