I have a biasi Riva combo m90e 24s boiler, 7 years old which will not start up for CH or Tap water, when I push the ingition button it does not spark to ignite the gas, the water pump motor runs for about 20 seconds then stops, also the left hand green indicator light flashes each second, the water pressure is at 1.25 bars cold and the gas supply is on, can you please help? Thank you.

Tim Thomson, January 2016