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Q5. State the possible cause, and outline the remedial action that should be taken when EACH of the following faults occur during starting of an automatic package boiler:

(a) The boiler starts and the fan runs with the control dampers correctly positioned, the boiler then locks out before purging is completed. (4)

(b) The boiler purges correctly, but the ignitors fail to spark, and the boiler locks out (4)

(c) The boiler purges correctly, the ignitors spark, but the boiler fails to light up and locks out. (4)

(d) The boiler flame flashes up but after about 5 seconds the automatic control locks the boiler out. (4)