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Page 12
Power is supplied but
control is blank.
Low Voltage circuit is not
engaged.
On 12-ton models turn on
built in breaker, all models
verify incoming power to
contactor, reset switch on
low voltage transformer.
Condensate is not pumping. Water is below pumping
level.
Reservoir fills, Check for line
crimping.
Fault Possible Cause Possible Solution
System starts up and cools
but hot air exhaust fan
speeds up and slows down.
Normal operating condition
especially in low tempera-
tures.
No action required, see
section VI/G.
Cool air flow is limited,
water is dripping from the
front of the system.
Supply or return duct is
collapsed, blocked or not
installed, filters need to be
replaced and/or the
evaporator coil is freezing as
a result of the above.
Verify that supply and return
ducts are installed to
specifications, remove or
add duct as needed, check
air filter for blockage.
Restart when thawed.
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