Friedrich KUHL R-410A Service Manual page 61
115 & 208-230-volt cool only, 208-230-volt cool with electric heat, 208-230-volt heat pump with electric heat, 115-volt heat pump
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Also See for KUHL R-410A:
- Service manual (47 pages) ,
- Parts manual (16 pages) ,
- Service and parts manual (17 pages)
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COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
P
o r
b
e l
m
Unit does not run
P
o r
b
e l
m
Evaporator coil
freezes up
P
o r
b
e l
m
Compressor runs
continually & does
not cycle off
P
o r
b
e l
m
Electronic control
board does not
turn unit off
60
P
o
s
s
b i
e l
C
a
u
s
Fuse blown or circuit tripped
Power cord not plugged in
System button in "OFF" position
Inoperative system button or open
electronic control board
Loose or disconnected wiring
control board or other components
P
o
s
s
b i
e l
C
a
u
s
Dirty fi
t l
r e
Restricted airfl ow
Inoperative thermistor
Short of refrigerant
Inoperative fan motor
Partially restricted capillary tube
P
o
s
s
b i
e l
C
a
u
s
Excessive heat load
Restriction in line
Refrigerant leak
Compressor relay contacts stuck
Remote wall T-stat incorrectly wired
Thermistor shorted
P
o
s
s
b i
e l
C
a
u
s
Compressor relay contacts stuck
Temperature set at coldest point
Incorrect wiring
Unit undersized for area to be
cooled
Defective thermistor
e
Replace fuse, reset breaker. If repeats, check
fuse or breaker size. Check for shorts in unit
wiring & components
Plug it in
Set correctly
Test for continuity. Check alarms. Correct
as needed.
Check wiring & connections. Reconnect per
wiring diagram
e
C
e l
a
n
a
s
e r
Check for dirty or obstructed coil. Use
pressure wash or biodegradable cleaning
agent to clean
Check alarms. Replace as necessary.
De-ice coil & check for leak
Test fan motor & replace if inoperative
De-ice coil. Replace capillary tube.
e
Unit undersized. Test cooling performance &
replace with larger unit if needed. See sizing chart.
Check for partially iced coil & check
temperature split across coil
Find leak and repair.
Check operation of t-stat. Replace if contacts
remain closed.
Refer to appropriate wiring diagram
Replace thermistor or electronic control board
e
Replace electronic control board
Turn to higher temp. setting to see if unit
cycles off. If not, replace control board.
Refer to appropriate wiring diagrams
Refer to industry standard sizing chart
Replace thermistor or electronic control board
Possible Solution
Possible Solution
c
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m
m
e
n
d
e
d
n i
O
w
n
r e
s '
M
Possible Solution
Possible Solution
a
n
u
l a
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