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10 Fault Finding
10.1 Faults indicated on the display
When indicating a fault, the display is back-lit in red. In addition, the type of fault is indicated by
symbols. The individual fault messages can be retrieved using the rotary selector. Fault messages
continue to be displayed until the fault is rectified.
B In the case of sensor faults, eliminate the cause of the fault to cancel display of the fault.
B With other faults, eliminate the cause of the fault and then press the rotary selector
display of the fault.
Indication/Type of fault
Effect
Sensor failure S1 ... S8
Associated components
(pumps/valves) are switched
off.
Sensor short circuit S1 ... S8
Associated components
(pumps/valves) are switched
off.
"No fluid flow in solar systems"/"secondary system"
The temperature difference
between collector
temperature sensor and
bottom cylinder temperature
sensor or between heat
exchanger flow temperature
sensor and bottom cylinder
temperature sensor is too
great.
Tab. 13
Possible faults indicated on the display
Possible causes
Temperature sensor not/
incorrectly connected.
Temperature sensor or sensor
lead defective.
Temperature sensor or sensor
lead defective.
Air in the system.
Pump is stalled.
Valves or shut-offs are closed.
Pipe clogged.
6 720 644 593 (2010/04)
FAULT FINDING
ok
Remedy
Check sensor connections.
Check temperature sensors for
breakages or incorrect
positioning.
Replace temperature sensor.
Check sensor lead.
Replace temperature sensor.
Check sensor lead.
Bleed the system.
Check the pump.
Check valves and isolators.
Check/flush out pipe.
to cancel
79
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