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HEAT/COOL ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
Possible Solution
Possible Solution
Possible Solution
esuaC elbissoP melborP
Room temperature
uneven
(Heating cycle)
Bad indoor ambient thermistor Check error codes. Replace if needed.
Close doors, windows, etc.
Opened doors, windows, etc.
esuaC elbissoP melborP
Unit will not
defrost
Incorrect wiring Refer to appropriate wiring diagram
esuaC elbissoP melborP
Does not heat
adequately
Dirty fi launaM s’renwO ni dednemmocer sa naelC retl
Unit undersized
Check heat rise across coil. If unit operates
effi ciently, check if insulation can be added
to attic or walls. If insulation is adequate,
recommend additional unit or larger one
Outdoor t-stat open (applicable
models)
T-stat should close at 38°F. Check continuity
of control. If temperature is below 38°F,
replace control
Heater hi-limit control cycling on &
off
Check for adequate fan air across heater.
Check control for open at 160°F & close at
150°F
Shorted supplementary heater Ohmmeter check, approx. 32-35 ohms
Incorrect wiring Check applicable wiring diagram
Bad outdoor coil thermistor or
electronic control board
Outdoor temperature below
32 degrees
Check error codes. Replace needed part.
Ambient temperature will have to
rise above 32 degrees F for frost
to melt