We returned home from a holiday to discover water at the foot of our
forced-air natural gas furnace and a ring of ice around the pipes that lead
into the cooling coils in the plenum on top of the furnace.
We also discovered that the furnace fan will no longer run on the
continuous, low speed.
My belief is that the fan failed, allowing frost to build up on the coils
and seize up the whole system. If this theory is correct, does it mean that
the air conditioning system itself has suffered major damage? Also, is it
possible to buy a system that will automatically shut down in the event of a
fan malfunction. Our system is a Bryant unit; at least five years old. Any
advice much appreciated.
A sail switch and a low pressure cut out switch that will cut control
voltage to the control contactor will protect against freezeup damages.
Liquid refrigerant flood back to the compressor could ruin the
compressor. - udarrell
most freezups i have in my rentals are from the a coil being clogged
with dirt . a fan motor failing would cause the same thing.or maybe the
ice caused the fan motor or starting capaciter to go out. thats why a
yearly check and cleaning of the a coil and blower fins is important. i
would let it all thaw out and check the coil for dirt and clean if necc,
then see how it acts.i think there are models that turn off the
compressor when the a coil freezes up.
My A/C has a drip pan to catch the water that condenses on the coil. I
suppose they all have those. The drip pan has a drain that can get
clogged with dust so that the pan overflows. Maybe the pan would freeze
up if it floods the coil? Anyway a person has to keep that drain clear.
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