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Faults
8.2
Faults not indicated on the display
Type of fault
Effect
Pump not running even though conditions for switching on are met.
The solar storage cylinder is
not being supplied by the
solar thermal system.
The system animation on the display is running and the pump is "humming".
The solar storage cylinder is
not being supplied by the
solar thermal system.
Temperature sensor is displaying an incorrect figure.
Pump is being activated/deac-
tivated too early/too late.
Domestic hot water is too hot.
Risk of scalding
Domestic hot water too cold (or hot water flow rate too slow).
Tab. 40 Possible faults not indicated on the display
Logamatic SC40 - Technical specifications are subject to change without prior notice.
Possible causes
No power supply; fuse or power
cable faulty.
Pump switched off in "manual
mode".
The temperature at the bottom of
the cylinder is close to, or above the
set maximum cylinder temperature.
The collector temperature is close
to, or above the set maximum col-
lector temperature.
There is no electrical power lead to
the pump or it is not connected.
Cooling function active.
The controller checks which cylin-
der can be charged (only in systems
with two cylinders)
Pump is faulty.
The pump is stalled due to a
mechanical blockage.
Temperature sensor incorrectly fit-
ted.
Incorrect temperature sensor fitted.
Storage cylinder temperature limit
and mixing valve are set too high.
Domestic hot water thermostat on
heating appliance, on heating con-
troller or on mixing valve is set too
low.
Remedy
Check fuse and replace if necessary.
Have electrical system checked by an
electrician.
Use the "manual mode" function to
switch to automatic.
When the temperature drops 3 K
below the maximum cylinder tempera-
ture, the pump switches on.
When the temperature drops 5 K
below the maximum collector tempera-
ture, the pump switches on.
Check the line.
–
–
Check pump and replace if necessary.
Unscrew and remove the slotted
screw on the pump head and use a
screwdriver to release the pump shaft.
Do NOT strike the pump shaft.
Check position, installation and type of
sensor; add heat insulation if neces-
sary.
Set the cylinder temperature limit and
hot water mixer to a lower setting.
Set temperature according to the
appropriate operating instructions
(max. 60 °C).
8
(
)
°C
(
)
°C
71
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