Specifications

24 | Troubleshooting SM CS Series Heat Pump
SM CS Series Heat Pump8 733 920 846 (2014/01) Subject to change without prior notice
Comfort Alert Module -Flash Codes
Status LED
Status LED
Description
Status LED Troubleshooting Information Solution
YELLOW "ALERT"
FLASH CODE 3
Short Cycling
Compressor is
running only briefly
1. Thermostat demand signal is intermittent
2. Time delay relay or control board defective
3. If high pressure switch present go to Flash Code 2
information
4. If low pressure switch present go to Flash Code 1
information
YELLOW "ALERT"
FLASH CODE 4
Locked Rotor 1. Run capacitor has failed (may not be bad, verify)
2. Low line voltage (contact utility if voltage at disconnect
is low)
• Check wiring connections
3. Excessive liquid refrigerant in compressor
4. Compressor bearings are seized
• Measure compressor oil level
YELLOW "ALERT”
FLASH CODE 5
Open Circuit 1. Outdoor unit power disconnect is open
2. Compressor circuit breaker or fuse(s) is open
3. Compressor contactor has failed open
• Check compressor contactor wiring and connectors
• Check for compressor contactor failure (burned,
pitted or open)
• Check wiring and connectors between supply and
compressor
• Check for low pilot voltage at compressor contactor
coil
4. High pressure switch is open and requires manual reset
5. Open circuit in compressor supply wiring or
connections
6. Unusually long compressor protector reset time due to
extreme ambient temperature
7. Compressor windings are damaged
• Check compressor motor winding resistance
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