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7
M a l f u n c t i o n s
Please refer to the control unit manual for troubleshooting malfunctions shown on the control
unit display.
Fault
Pump noise
Insufficient tapping quantity
Insufficient tapping tempe-
rature
Drinking water does not
heat up
7
M a i n t e n a n c e / s e r v i c e
The manufacturer recommends having the system serviced annually by authorised, special-
ist personnel.
7.1
Cleaning the heat exchanger
Regularly clean the unit if deposit build-up can be expected due to unfavourable water quality
(e.g., extremely hard water or pronounced soiling). Cleaning maintains the flow rates in the
event of scale deposits, but it also reduces the service life.
There is the option of cleaning the unit by flushing it.
Flush the heat exchanger in the direction opposite to the normal flow direction using a suita-
ble cleaning solution.
Make sure any chemicals used for cleaning are suitable for stainless steel, copper or nickel.
Non-compliance may result in permanent damage to the heat exchanger! Always observe
the cleaning agent manufacturers' safety instructions and recommendations. Use only chlo-
ride-free water or water with a low chloride content and water hardness for cleaning solu-
tions. Choose the cleaning agent to match the type of contamination and resistance of the
heat exchanger plates. It is important to obtain confirmation from the cleaning agent manu-
facturer that the cleaning agent will not cause corrosion of the heat exchanger plates to be
cleaned. Clean the heat exchanger as per the cleaning agent manufacturer's work instruc-
tions.
Neutralise any remaining acids in the system after cleaning; passivate all metal surfaces.
Passivation is mandatory to prevent any development of corrosion.
Always rinse the clean heat exchanger and system using a sufficient amount of fresh water.
906.50.02.00
Last updated 2022/03/16
Possible cause
Air in the system
Insufficient water pressure
Calcification in heat exchan-
ger
Incorrect adjustment on the
control unit
Excessive pressure loss in
the piping on the heating
side
Control unit not in operation.
Air in the system.
HW flow sensor not con-
nected correctly, or defec-
tive.
Heating flow temperature
sensor not connected cor-
rectly or faulty.
Pump faulty
Volume flow sensor faulty
- 16 -
Troubleshooting
Bleed
Check pressure, increase if
necessary
Decalcify/replace
Check settings
Check the piping, change if
necessary
Check control unit
Bleed
Check, replace if applicable
Check, replace if applicable
Check, replace if applicable
Check and replace if applica-
ble
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