8 Troubleshooting
8.1 Fault description
Fault description
Cause
Solution
Hot water function
Hot water temperature too low or
fluctuating
Central heating
Buffer temperature too low
Buffer temperature must be
5-10 K
above hot water setpoint
Heating circuit pump type not
supported
Check the central heating pump
Setting for heating circuit pump is
not correct
Heating circuit pump setting: Constant pressure
Pump performance too low
Check the pump performance
Mixing valve faulty
Check the mixing valve function
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
Heat interface unit
Strainer in primary flow dirty
Clean the strainer in the primary flow
Insufficient differential pressure
Clean the capillary of the differential pressure control, check if differential
pressure control is working
Air in the system
Vent/flush the system
Insufficient heating volume flow
passes through the heat exchanger
Check the volume flow using heat meters
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
Thermostatic hot water temperature
limiter setting is not correct:
Check the thermostatic hot water temperature limiter (if installed) is
working and correctly set
Proportional volume control does
not switch over
Replace the proportional volume controller
Waiting time for hot water is too
long
Check the pump setting in the
central heating system
Pump setting: Constant pressure
The temperature setting on the
thermostatic lead module (TTV) is
too low
Increase the temperature setting on the thermostatic lead module (TTV)
or in the line
The capillary on the thermostatic
lead module (TTV) is dirty
Clean the capillary on the thermostatic lead module (TTV) or in the line
No thermostatic lead module (TTV)
available
Retrofit the thermostatic lead module (TTV) or line
Noise generation
Noise generated in the station
Pipe clamps too tight
Loosen the pipe clamps
Cold water throttle disc is dirty
Clean the cold water throttle disc
Noise generated in the PM valve
Noise generated via a third route
Replace the inductor disc, spring and locking ring using are placement kit
for PM valves, 3rd route
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
Air trapped in buffer storage
Vent the buffer storage tank
Insufficient differential pressure
Clean the capillary of the differential pressure control, check the
differential pressure control is working
Air in the system
Vent/flush the system
Radiator supply
Supply flow rate too low / too high
Check the zone valve setting
16
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Combi Port XS
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Installation and operation manual
