YOur 1f code is actually a IF code which stands for "ignition failure".
This can be caused by many things, but the most likely is either the ignitor has failed, or the flame sensor has failed.
Make sure the gas manual gas valve is open. Remove from panel so that you can see the ignitor.
Turn off power, then turn back on. After 90 seconds, the ignitor should start to glow red hot. If this is not occuring, then it is likely the ignitor or ignitor wiring.
If the ignitor does glow, then the heater ignites, but still goes off showing the IF code, then it is the flame sensor.
If the ignitor glows, and the heater does not ignite, it is likely the gas valve or ignition control.
As stated above, the ignitor is most likely
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