I can hear unit trying to come on, but it does not blow any hot air. Also I notice that the unit does not seem to come on at all when thermostat is set to auto. When thermostate is set to "on", unit tries to fire up, but doesn't blow any hot air. It looks like Pilot Light is out, but I am pretty sure that it is electric ignition Pilot Light. Is there anything that I could check? Does anyone have any possible ideas of what the problem may be and an estimate of what it could cost to repair?