Service & Parts Manual (Non Q) (2019, 2020, 2021, 2022)

75 PB
TROUBLESHOOTING
COMPLAINT CAUSE SOLUTION
Water “spitting” into room
Sublimation:
When unconditioned saturated, outside
air mixes with conditioned air, conden-
sation forms on the cooler surfaces
Ensure that foam gaskets are installed in
between window panes & in between the unit &
the sleeve. Also, ensure that fresh
air/exhaust vents (on applicable models) are in
the closed position & are in tact
Downward pitch of installation is too
steep towards back of unit
Follow installation instructions to ensure that
downward pitch of installed unit is no less than
1/4” & no more than 3/8”
Restricted coil or dirty  lter
Clean & advise customer of periodic cleaning &
maintenance needs of entire unit
Excessive moisture
Insufcient air circulation thru area to
be air conditioned
Adjust louvers for best possible air circulation
Inadequate vapor barrier in building
structure, particularly  oors
Advise customer
Unit short cycles
Defective thermistor Replace thermistor or electronic control board
Unit oversized See sizing chart. Correct as needed.
Chassis seal gasket not sealing or
absent causting unit to short cycle
Check gasket. Reposition or replace as needed
Restricted coil or dirty  lter
Clean & advise customer of periodic cleaning &
maintenance needs of entire unit
Prolonged off cycles
Defective indoor ambient thermistor or
electronic control board
Check alarms. Replace thermistor or electronic
control board
Outside water leaks
Evaporator drain pan cracked or ob-
structed
Repair, clean or replace as required
Obstructed condenser coil
Use pressure wash or biodegradable cleaning
agent to clean
Fan blade/slinger ring improperly
positioned
Adjust fan blade to 1/2” of condenser coil  n
pack
Tips continued