FAULT FINDING
6 720 643 603 (2011/11)
21
8 FAULT FINDING
Information regarding faults can also be found in the installation instructions for the controllers.
Type of fault
Effect Possible causes Remedy
Pump not running although activation conditions are met.
The solar storage
tank is not being
supplied by the
solar heating
system.
Pump is faulty.
Check the pump and replace if necessary.
The pump is stalled due to a mechanical
blockage.
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 with the screwdriver.
Pump is not responding to the controller.
See controller instruction manual.
Pump continually switching on and off.
Solar yield too low. Not enough difference between activation
and deactivation temperatures on the
controller.
Check controller settings.
Volumetric flow rate too high. Check and adjust the flow rate.
Temperature sensor position or contact is
not correct.
Check temperature sensor position.
Pump does not switch off.
Heat is being
transferred out of
the storage tank.
Temperature sensor faulty or in wrong
position.
Check temperature sensor position,
mounting and characteristics.
Controller faulty.
Note: speed-controlled pumps do not switch
off immediately, but only once the lowest
speed is reached.
Domestic hot water is too hot.
Risk of scalding Storage tank temperature limit and
blending valve are set too high.
Set the storage tank temperature limit and
blending valve to a lower setting.
Domestic hot water too cold (or volume of domestic hot water is too low).
Domestic hot water thermostat on heating
appliance, on heating controller or on
blending valve is set too low.
Set the temperature as instructed in the
applicable operating manual (max. 60 °C).
Check that backup heating is functioning
properly.
Tab. 11
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