Riello KV/200 20 ISC Solar Installation And Maintenance Manual page 51

FAULT
The boiler does not reach its
temperature set point.
Burner locks out.
Boiler reaches set
temperature but radiators are
still cold.
Pump does not start.
The safety valve keeps
opening.
CAUSE
Burner dirty.
Insufficient air/fuel flow to burner.
Boiler settings.
Boiler settings.
No water supply.
Air in the circuit.
Pump malfunctioning.
Pump malfunctioning.
Problem with CH circuit safety
valve.
Circuit pressure too high.
Problem with CH circuit
expansion vessel.
SOLUTION
Clean the combustion chamber.
Check and adjust the burner.
Check correct functioning.
Check temperature setting.
Check correct functioning.
Check temperature setting.
Check electrical wiring.
Check positioning of sensors.
Check the vent and bleed valves.
Check CH circuit pressure.
Bleed the circuit.
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.
TECHNICAL ASSISTANCE SERVICE
51