Ideal Boilers FF 330 Installation And Servicing

Also see for Classic FF 330: User guide

Ideal Boilers FF 330 Installation And Servicing Manual pdf 35 page image

Classic Slimline FF - Installation & Servicing 35FAULT FINDINGFAULT FINDING FAULT FINDING FAULT FINDINGCheck all connections to PCB.If no fault found, replace PCBReset the overheat 'stat. Set control'stat to maximum. Allow the boilerto reach temperature - if theoverheat 'stat trips again, measureflow temperature.If above 90°C replace control 'stat.If below 90°C replace overheat 'stat.STARTIs the mains on neon 'I3' illuminated?YESNOYESIs there a live supply on EITHERterminal of overheat 'stat?Is the ignition electrode sparking?YESNOCheck mains supply and fuses.Check programmer and systemthermostats are all ON.Check that boiler plug and socketare OK and fully connected.Check that the boiler thermostat isset at maximum and the mains on/offswitch is ON. Is the fan turning ?Replace the sensorCheck connections and leads topressure switch. If no fault foundchange pressure switch.Check all connections to PCB.If no fault found change PCB.Check pressure switchsensing pipes forblockages, bad connectionsand reversed connection.Is pressure difference atswitch greater than0.9 mbar?ChangefanYES NOChangepressure switchIs the boiler casingcorrectly fitted?Does the pilot light ?YESNODoes the sparkstop after thepilot is lit?Is there a gassupply to theboiler?Is the pilotinjector blocked?YESReplacegas valveNOIs there a supply on terminalsof main gas valve?YESNOYESNONOIs there a supply on the fanconnector at PCB ('Molex' marked'FAN'?).YESYESNONOCheck thepolarity of themains supply.Check thecontinuity ofthe ignitionlead fromconnector toelectrode.Does thespark nowcease whengas is lit?Ensure pilot andmain gas valveleads are notcrossed over.Is there a supplyvoltage at pilotgas valve?Is there a live supply on the redlead to the pressure switch?NOIs there a regular spark fromtube 'SG1' on the PCB?Can the overheat 'statbe reset when thesystem is cold ?NOYESNOReplace fuse BUT, beforeattempting to start boiler, check forshort between live and neutral,also between live and earth, on allitems plugged into PCBCheck all connections to PCB.If no error found, replace PCB.Remove the sensor(NTC) from the PCB.Is the fan turning ?YES NONOYESHas the fuse blown on PCB ?NONOIs there a live supply on theviolet lead to pressure switch?Is there a supply at the fan?Replace the overheat thermostatDoes main burnercross-light from pilot?Is the main burnerinjector clear?Replace main gassolenoid valveCheck gap at ignition electrode.Check electrode and lead areundamaged and not close toearthed metalwork.YESYESChangefanYES NORectify badconnectionYESNOYESYESCheck PCB by substitutionIs there a live supply onBOTH terminals of limit stat?YESChange limit thermostatNONOIs there a live supply on BOTHterminals of overheat 'stat?YESNO