50 | troubleshooting SM Series Heat Pump
SM Series Heat Pump6 720 220 406 (2013/1) Subject to change without prior notice
Compressor Ohms
Model Start Winding Run Winding
SM024 1.64 1.3
SM036 1.52 0.88
SM048 1.86 0.52
SM060 1.63 0.39
SM070 1.85 0.34
Tolerance +/- 7%. All resistance values must be
measured with compressor at room temperature.
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
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