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does not turn on right away?

when I turn up the heat in my house, the unit will make noise... and I can smell gas... then a few minutes later it will start.. but with a bang... because all of the gas in the air ignites. I am concerned, that this is dangerous and something is going to happen. what should i do?
lianne, October 2009
Shut the system down straight away - and call out a gas engineer ASAP. Find an electric heater in the meantime....please, do it NOW.

John, October 2009