Riello ALUDOMUS SOLAR KV/200 20 ISC SOLAR Installation And Maintenance Manual page 112

THECNICAL ASSISTANCE SERVICE
FAULT
Burner locks out.
Boiler reaches set
temperature but
radiators are still cold
Pump does not start.
The safety valve keeps
opening
The storage cylinder safety valve
keeps opening
Insufficient domestic hot water
The solar circuit safety valve keeps
opening
CAUSE
Boiler settings
No water supply
Air in the circuit.
Bleed the circuit
Pump malfunctioning
Problem with CH circuit safety valve
Circuit pressure too high
Problem with CH circuit expansion
vessel
Storage cylinder safety valve problem − Check valve setting and efficiency
Check DHW circuit pressure
DHW expansion vessel problem
Supply pressure is too high
Flow rate too high
Lime scale and/or sludge in
storage cylinder
Problem with solar circuit safety
valve
Solar circuit pressure too high
Problem with solar circuit expansion
vessel
112
SOLUTION
− Check correct functioning.
− Check electrical wiring.
− Check positioning of sensors
− Check the vent and bleed valves.
− Check CH circuit pressure.
− Pump malfunctioning
− Unseize the pump.
− Change the pump.
− Check pump electrical connections
− Unseize the pump.
− Change the pump.
− Check pump electrical connections
− Check valve setting and efficiency
− Check circuit pressure.
− Check pressure reducer
− Check efficiency of expansion vessel
− Check central heating circuit pressure
− Check the efficiency of the expansion
vessel.
− Fit a pressure reducer
− Fit a flow reducer
− Check and clean
− Check functioning of DHW
− circuit pump
− Check the temperature setting
− Check the positioning of sensors
− Check boiler operating
− temperature
− Check valve setting and efficiency
− Check solar circuit pressure
− Check efficiency of expansion vessel