8 Troubleshooting
8.1 Fault description
Fault description
Cause
Solution
Hot water function
Hot water temperature too low or volatile
Central heating
Buffer temperature too low
Buffer temperature must be
5-10 K
above hot
water setpoint
Heating circuit pump type not supported
The following pump type is supported: Grundfos
UMP3
Setting for heating circuit pump is not correct
Heating circuit pump setting: Constant pressure
Pump performance too low
Check the pump performance
Setting for heating circuit control is not correct
Check the heating circuit control setting
Heating circuit control faulty
Check the heating control function
Air trapped in buffer storage
Vent buffer storage tank
Cold water pressure too low/too high
Cold water pressure at unit:
Min. 2 bar, Max. 4 bar
Insufficient differential pressure
Clean the capillary of the differential pressure
control, and check that the differential pressure
control is working
Heat interface unit
Strainer in heating supply (primary) dirty
Clean the strainer in the heating supply (primary)
Air in the system
Vent the system
Insufficient heating volume flow passes through
the heat exchanger
Check the volume flow
Heat meter type not supported
Use heat meter type with
Qn 1.5
ultrasound
Insufficient heating volume flow
Increase differential pressure
Heat exchanger dirty
Clean the heat exchanger
Hot water temperature limiter setting is not
correct
Check setpoints via the App, in the display
"Hotwater"
Check the controller setting
Check setpoints via the App, in the display "Hot
water"
Waiting time for hot water is too long
Check the pump setting in the central heating
system
Pump setting: Constant pressure
The temperature setting in the controller is too
low
Increase the temperature setting via the App in the
display "Supply" or in the line
Noise generation
Noise generated in the station
Insulation is not closed or not present
Fully close the insulation cover
Heating function
Heating system does not heat up
General
Supply temperature too low at the heat source
Check the supply temperature at the heat source
Volumetric flow rate is too low
Check the fittings in the device
Check the heat meter type
The heat meter type must be Qn 1.5
Check the pump setting
Pump setting: Constant pressure
Air trapped in buffer storage
Vent the buffer storage tank
Air in the system
Vent the system
Setting for room thermostat is not correct
Check the setting at the room thermostat
Strainer is dirty
Clean the strainer
Check the controller setting
Check the setpoints via the App, in the display
"Heating"
Heating system does not heat up
Underfloor heating controlled by setpoint values
Pump not connected
Check the pump connection
Strainer is dirty
Clean the strainer
Pump setting is not correct
Check the pump setting
Setpoint is not correct
Check the setpoints via the App, in the display
"Heating"
Underfloor heating, weather compensated
Controller setting is not correct
Check the setting via the App, in the display
"Heating"
Outdoor sensor faulty
Replace the outdoor sensor
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Combi Port E D
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Installation and operation manual
