Page 65
Corp. 1244-L9
Continued — 18 - 24 kBtu System Status or Error Codes — Indoor Character Display and Outdoor LEDs
Indoor
Unit
Display
Outdoor Unit LED Status
Error Description System Status
Troubleshooting for Possible
Causes
This unit has three display
status indicators
o OFF
n ON ® BLINKS
D5 D6 D16 D30
U5 o
n ® n
Entire unit current monitoring
malfunction
All system functions are terminat
ed except indoor fan.
• Outdoor control malfunction.
• Check refrigerant charge.
• Check for electric current error
(low current amperage or
overcurrent).
S Relocate the coil sensor from its
current position onto the large
line leaving the indoor coil.
Secure the sensor with a tie
wrap.
U7
n
o
®
o Reversing valve malfunction
All system functions are termi
nated except indoor fan.
S Check input voltage on outdoor
unit terminal strip (N and L termi
nals). If lower than 175 VAC, cor
rect voltage problem.
S Check reversing valve wiring
connection for damage.
S If voltage and wiring connections
are correct, replace reversing
valve.
U9
n n ®
o
Outdoor unit zero cross
detection error
Replace outdoor control.
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