24 | Troubleshooting LM CS Series Heat Pump
LM CS Series Heat Pump8 733 920 847 (2014/01) Subject to change without prior notice
YELLOW "ALERT”
FLASH CODE 6
Open Start Circuit
Current only in run
circuit
1. Run capacitor has failed (may not be bad, verify)
2. Open circuit in compressor start wiring or connections
• Check wiring and connectors between supply and the
compressor "S'" terminal
3. Compressor start winding is damaged
• Check compressor motor winding resistance
YELLOW "ALERT”
FLASH CODE 7
Open Run Circuit
Current only in start
circuit
1. Open circuit in compressor run wiring or connections
• Check wiring and connectors between supply and the
compressor "R” terminal
2. Compressor run winding is damaged
• Check compressor motor winding resistance
YELLOW "ALERT"
FLASH CODE 8
Welded Contactor
Compressor always
runs
1. Compressor contactor has failed closed
2. Thermostat demand signal not connected to module
YELLOW "ALERT"
FLASH CODE 9
Low Voltage
Control circuit <
17VAC
1. Control circuit transformer is overloaded
2. Low line voltage (contact utility if voltage at disconnect is low)
• Check wiring connections Flash Code number
corresponds to a number of LED flashes, followed by a
pause and then repeated. TRIP and ALERT LEDs flashing
at same time means control circuit voltage is too low for
operation
Comfort Alert Module -Flash Codes
Status LED
Status LED
Description
Status LED Troubleshooting Information Solution
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