26
COOlING ONlY ROOM AIR CONDITIONeRS: TROUBleSHOOTING TIPS
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Unit does not run
Fuse blown or circuit tripped
Replace fuse, reset breaker. If repeats, check
fuse or breaker size. Check for shorts in unit
wiring & components
Power cord not plugged in
Plug it in
System switch in “OFF” position
Set switch correctly
Inoperative system switch or open
control board
Test for continuity
Loose or disconnected wiring at
switch, control board or other com-
ponents
Check wiring & connections. Reconnect per
wiring diagram
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Evaporator coil
freezes up
Dirty
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Restricted air
fl
ow
Check for dirty or obstructed coil. Use
pressure wash or biodegradable cleaning
agent to clean
Inoperative t-stat or thermistors
Test for continuity
Short of refrigerant
De-ice coil & check for leak
Inoperative fan motor
Test fan motor & replace if inoperative
Partially restricted capillary tube
De-ice coil. Check temp. differential (delta T)
across coil. Touch test coil return bends for
same temp. Test for low running current
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Compressor runs
continually & does
not cycle off
Excessive heat load
Unit undersized. Test cooling performance &
replace with larger unit if needed
Restriction in line
Check for partially iced coil & check
temperature split across coil
Refrigerant leak
Check for oil at silver soldered connections.
Check for partially iced coil. Check split across
coil. Check for low running amperage
T-stat contacts stuck
Check operation of t-stat. Replace if contacts
remain closed.
T-stat incorrectly wired
Refer to appropriate wiring diagram
Thermistor shorted
Replace thermistor or electronic control board
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T-stat does not
turn unit off
T-stat contacts stuck
Disconnect power to unit. Remove cover
of t-stat & check if contacts are stuck. If so,
replace t-stat
T-stat set at coldest point
Turn to higher temp. setting to see if unit
cycles off
Incorrect wiring
Refer to appropriate wiring diagrams
Unit undersized for area to be
cooled
Refer to industry standard sizing chart
Defective thermistor
Replace thermistor or electronic control board
Summary of Contents for CP14E10
Page 1: ...Service Manual Compact Programmable CP 14 18 24 ServMan 04 09 Models 2009 2008...
Page 31: ...29 ELECTRONIC CONTROL WIRING DIAGRAM 2009 MODEL CP24E30 CP14E10 CP18E30...
Page 32: ...30 ELECTRONIC CONTROL WIRING DIAGRAM 2008 MODEL CP24N30 CP14N10 CP18N30...
Page 33: ...EXPLODED VIEW AND LIST OF PARTS 2009 MODEL CP14E10 CP18E30 AND CP24E30 31...
Page 34: ...2009 PARTS 32...
Page 35: ...2009 PARTS Continued 33...
Page 36: ...EXPLODED VIEW AND LIST OF PARTS 2008 MODEL CP14N10 CP18N30 AND CP24N30 34...
Page 40: ......
Page 41: ......
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