If you're using propane gas, the banging noise you hear is air in the gas line, which means either your tank is empty or the the tank regulator is frozen (if it's ,below freezing in your area). If the tank regulator is frozen, soak a bath towel in hot water and quickly place it around the regulator. It should thaw fairly quickly and the gas will start flowing again. However, you may need to purge the air out of the gas line to gas log burner. Rather than using the electronic ignitor, do it manually, until you smell gas, left off the control knob and wait 5 minutes and then try lighting the pilot electronically.
If you're using Natural Gas, it may still be a pressure problem to the burner. You'll need to have that professionally checked.
Hope this helped to solve your problem.
1.
Thermostat calls for heat.
2.
Draft inducer motor starts.
3.
Pressure switch attached by a small plastic or rubber tube senses the
negative pressure produced by the draft inducer and
closes.
4.
Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small
metal probe about 1/8" in diameter, with a white
porcelain base) does not sense the flame, so after 8
to 10 seconds the hissing sounds stops with no
ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back
off and on again. Then the sequence starts all over
again with no ignition of the gas.
Solution:You probably need to
purchase and install a new ignitor. I would suggest that you inspect your
ignitor closely for cracks. Make sure you do not
touch the ignitor with your bare hands. If you do not
visually see a crack, then you could have a furnace control board problem or a
limit, rollout switch problem. The furnace's control board
might not be supplying the voltage to the ignitor. If your furnace
lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then
you need to clean your flame sensor with light sand paper or steel wool. You
might need a new flame sensor, but most of the time they can be cleaned an will
work well after cleaning.
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