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hEAT / COOL ONLY rOOM AIr CONdITIONErS: TrOUBLEShOOTING TIPS
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Heat anticipator (resistor) shorted (on applicable
models)
Room temperature
uneven
Wide differential - partial loss of t-stat bulb charge Replace t-stat & check
(Heating cycle)
Incorrect wiring
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Defrost control timer motor not advancing
(applicable models)
Defrost control out of calibration (applicable
models)
Unit will not defrost
Defrost control contacts stuck
Defrost control bulb removed from or not making
good coil contact
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Exhaust or fresh air door open
Dirty fi
Unit undersized
Does not heat
adequately
Outdoor t-stat open (applicable models)
Heater hi-limit control cycling on & off
Shorted supplementary heater
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Disconnect power to unit. Remove resistor from
t-stat bulb block. Plus in unit & allow to operate.
Feel resistor for heat. If not heat, replace resistor
Refer to appropriate wiring diagram. Resistor is
energized during "ON" cycle of compressor or
fan.
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Check for voltage at "TM" & "TM1" on timer. If no
voltage, replace control
If outside coil temperature is 25F or below, &
preselected time limit has elapsed, replace
defrost control
If contacts remain closed between terminals "2"
& "3" of the defrost control after preselected time
interval has passed, replace control
Reinstall & be assured that good bulb to coil
contact is made
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Check if operating properly. Instruct customer on
proper use of control
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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
T-stat should close at 38°F. Check continuity of
control. If temperature is below 38°F, replace
control
Check for adequate fan air across heater. Check
control for open at 160°F & close at 150°F
Ohmmeter check, approx. 32-35 ohms
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Table of Contents
Troubleshooting
