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This is a natural occurance do to atmospheric conditions. As the heat from the gas burner warms the inside lining of the cold metal flue vent, the humidity in the room air creates condensation. In some cases, enough to drip down on the burner assembly. It is nothing to worrying about, unless it does not stop dripping after the burner has shut off.
F12 occurs on a multi-system or quick connect. It means one of the units on the system suffered a flame loss. More specifically, it means the flame rod stopped detecting flame on the burner. The most typical causes are as follows:
1) insufficient BTUS (low gas pressure) 2) leaking heat exchanger 3) clog in the manifold, burner, or heat exchanger 4) stuck flue damper or improperly sized venting 5) dirty flame rod 6) damaged circuit board or gas valve
From basement,crawl space or cut an opening in floor,to get to the damaged pipe. If you can cut it, you may be able to pull it out from another location and feed new material back. Unfortunately your going to have to apply heat and solder, in a confined space under the floor. Not too good!
ITS ALLWAYS A GOOD IDEA TO IMPROVE YOUR INSULATION , I WOULD SUGEST YOU CHECK YOUR RADIATORS ARE HEATING UP TO THE TOP IF NOT YOU NEED TO BLEED THEM, AND I AGREE WITH YOU AND PUT NEW INSULATING IN THE ATTIC AND LEAVE THE WALLS TILL LATER .
error code 11 is an ignition problem. make sure your gas pipe is sized properly, if your on propane check your tank and make sure it's not low or when it's running take the cover off and look in the flame window and make sure it's an even flame if not you probably have a gas control valve problem