166
Troubleshooting
It is not possible to switch immediately from DHW mode to heating mode
Possible causes Corrective action
Heat exchanger for room
heating is not large enough
• Set t_DHWHP_MAX to the minimum value, suggested value is 60min
• If the circulation pump outside the unit is not controlled by the unit, try
connecting it to the unit.
• Add a 3-way valve to the inlet of the fan coil unit to ensure sucient water
flow.
The heating load in the room
is reduced
• Normal, no need for heating.
The disinfect function is
enabled but without TBH
• Disable the disinfect function.
• Add TBH or AHS for DHW mode.
Manual activation of the
FAST WATER function,
after the hot water fulfils
the requirements, the heat
pump does not switch to air
conditioning mode
• Manual activation of the FAST WATER function.
The room temperature is
low, AHS does not start.
• Set T4DHWMIN, suggested value ≥ -5°C.
• Set T4_TBH_ON, suggested value ≥ 5°C.
DHW Priority
• If AHS or IBH are present, when the unit is not operating, IBH or AHS
must operate in DHW mode until the water temperature reaches the set
temperature before switching to heating mode.
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