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If
you are repairing a Lennox heating appliance that has been under water, safety
should be your first concern when it comes to making the decision about which
parts to replace. Secondly, the long term reliability of the appliance should be
considered. Generally speaking, any control that is part of the furnace's safety
controls, or any electrical part that is part of the furnace's gas train (gas
valves, regulators, gas pressure sensors), should be replaced if they have been
underwater, regardless of whether or not the part is working after the unit has
been dried out. This includes, but is not limited to the following parts:
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