DeDietrich MIV-4S AWHP 6 MR-3 User Manual page 49

Problems Probable causes
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 shower head is re­
stricting the water 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
The heat pump does The heating set point tem­
not work. perature is too low.
The heat pump is not op­
erating.
The water pressure is too
low (< 1 bar).
An error code appears on
the display.
The heat pump runs The temperature set point
short-cycling in do­ is too low
mestic hot water mode
The water pressure is Not enough water in the
too low (< 1 bar). installation.
Water leak.
Clicking in the central The central heating pipe
heating pipes clamps are too tight.
.
There is air in the heating
pipes.
The water is circulating too
quickly in the central heat­
ing system.
Significant water leak The pipes on the heat
underneath or in the pump or the central heat­
vicinity of the heat ing are damaged.
pump.
7682850 - v02 - 09012018
Corrections
Increase the value of parameter
Activate the domestic hot water mode.
Check and modify the comfort and reduced time ranges for the domes­
tic hot water.
Adapt the domestic hot water temperature set point.
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.
Contact the professional responsible for maintenance of the heat pump.
Increase the value of parameter
ted, increase the temperature on it.
Check that the heat pump is switched on.
Check the fuses and switches on the electrical installation.
Top up the system with water.
Correct the error if possible.
Increase the set point
Top up the system with water.
Contact the professional responsible for maintenance of the heat pump.
Slightly loosen the clamps.
Vent any air in the domestic hot water tank, the pipes and the taps to
prevent the annoying noises likely to be produced during heating or
when drawing off water.
Contact the professional responsible for maintenance of the heat pump.
Contact the professional responsible for maintenance of the heat pump.
9 Troubleshooting
.
or, if a room thermostat is connec­
MIV-4S 49