Hi guys. We had a central air system installed about 2 years ago. It never
has really worked all that well. What happens is after the unit is on for
about an hour or more, the unit inside the furnace freezes up. It just
starts to blow semi cold / warm air. If I turn the unit off , it'll thaw
itself out eventually and work again. I've had one guy come and look at it
already and he says everything is working fine.. Obviously it's not.
Suggestions? The small tube going into the furnace gets ice cold (Not
shielded). All the vents in the house are open. It's a 3 tonne unit, 1800
0about an hour or more, the unit inside the furnace freezes up. It just
istarts to blow semi cold / warm air. If I turn the unit off , it'll thaw
aitself out eventually and work again. I've had one guy come and look at it
dalready and he says everything is working fine.. Obviously it's not.
rSuggestions? The small tube going into the furnace gets ice cold (Not
ashielded). All the vents in the house are open. It's a 3 tonne unit, 1800
When I first turn the system on, the small tube will stay warm for awhile.
Takes an hour or more then it will get ice cold. The furnace filter is new,
first thing I checked. All vents are wide open.
Thanks for the replies!
Often on an otherwise properly working unit that means the freon is
low. But since it sounds like your unit has never worked properly
there are many other things that could be the problem. The airflow
over the inside coil could be too low. Was this unit added to an
existing forced air heating system? The air handler inside needs to
be rated to provide enopugh air flow for a 3 ton unit. The fan
setting inside the unit needs to be on high for ac. It's not likely
that you will be able to fix it yourself. Did you have the original
installers try to fix it? How many times? Enough to figure out they
are morons? You might need to get someone that knows what they are
doing take a look at it, it's not likely that anyone will be able to
diagnose it very well over the internet.
With the liquid line starting warm, and then going to frosty, I'm thinking
either clogged filter, or maybe solder balled joint some where.
Hard to tell without a tech there at the house taking readings.
If it was low air flow, I'd expect a frosty suction line, and an ice dam in
the evaporator. But frosty liquid line?
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