Ideal Boilers Mexico Super 100 FF Installation And Servicing Manual

Ideal Boilers Mexico Super 100 FF Installation And Servicing Manual Manual pdf 38 page image

38 Mexico Super 100 FF & 125 FF - InstallationFAULT FINDINGCheck all connections to PCB.If no fault found, replace PCBReset the overheat 'stat. Set control'stat to maximum. Allow the boiler toreach temperature - if the overheat'stat trips again, measure flowtemperature.If above 90°C replace control 'stat.If below 90°C replace overheat 'stat.STARTCheck that the mains on neon'I3' is illuminated.YESNOYESYESNOIs there a live supply to bothterminals of overheat 'stat?(if fitted)Is the ignition electrode sparking?YESYESYESChange fanYESNORectify bad connectionCheck mains supply and fuses.Check programmer and systemthermostats are all ON. Check thatboiler connections are OK .Check that the boiler thermostatis set at maximum and the mainson/off switch is ON.Is the fan turning ?Check connections to pressureswitch. If no faults found, changepressure switch.Replace the boiler thermostatCheck connections and leads topressure switch/boiler thermostatand check that fan is operating.Check all connections to PCB.If no fault found change PCB.YESCheck pressure switch sensingpipes for blockages, badconnections and reversedconnection.Is pressure difference at switchgreater than 0.9 mbar?Change fanYES NOChangepressure switchDoes the pilot light ?NOYESNOYESDoes thespark stopafter pilot islit?NOIs there a gas supplyto the boiler?Is the pilot injectorblocked?YESReplacegas valveNOIs there a supply onterminals of main gasvalve?YESNOYESNO NOIs there a supply on the fanconnector at PCB ('Molex 'marked 'FAN'?).YESYESNONOCheck the polarity ofthe mains supply.Check the continuity ofthe ignition lead fromconnector to electrode.Does the spark nowcease when gas is lit ?Ensure pilot andmain gas valveleads are notcrossed over.Is there a supplyvoltage at pilotgas valve?Is there a livesupply on thered lead topressureswitch?NOIs there a regularspark from tube 'SG1'on the PCB?Can the overheat 'statbe reset when thesystem is cold ?NO YESNOReplace fuse BUT, beforeattempting to start boiler, checkfor short between live andneutral, also between live andearth, on all items plugged intoPCBCheck all connections to PCB.If no error found, replace PCB.Is there continuityacross the controlthermostat ?YES NONOYESHas the fuse blown on PCB ?NONOIs there a live supply on theviolet lead to pressure switch?Is there asupply atthe 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.FAULT FINDING