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Fault / Cause / Remedy
Fault Cause Remedy
Leakage at buffer Pipe connections leaking Re-seal
Temperature difference to small at solar
heat exchanger
Incorrect settings on solar heat controller Change parameters (in particular control
temperature difference)
Flow (solar-side) too low Bleed solar circuit Repair blockages
Increase pump power
Heat exchanger dirty Cleaning
None / too little discharge of the tank Reversing valve defect/ connected in-
correctly
Restore function
Control of the solar return temperature
rise (SRTA) poorly adjusted/defect
Change parameters (in particular tempe-
rature difference)
Flow (heating-side) too low Bleed heater circuit, repair blockage,
increase pump power
Undesired cooling down of tank only in
the lower tank area
Gravity circulation in the solar circuit Close / install
gravity brake
Undesired cooling down of tank in the
entire tank area
Insulation is open / is not in contact with
the tank
Close insulation
Gravity circulation in the heater circuit Install / close
gravity brake
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