Bosch GreenSource SM024 Installation And Maintenance Manual page 50

50 | troubleshooting
Compressor Ohms
Model Start Winding
SM024 1.64
SM036 1.52
SM048 1.86
SM060 1.63
SM070 1.85
Tolerance +/- 7%. All resistance values must be
measured with compressor at room temperature.
Status LED
YELLOW "ALERT" Short Cycling
FLASH CODE 3 Compressor is
running only briefly
YELLOW "ALERT" Locked Rotor
FLASH CODE 4
YELLOW "ALERT" Open Circuit
FLASH CODE 5
6 720 220 406 (2013/1)
Run Winding
1.3
0.88
0.52
0.39
0.34
Comfort Alert Module -Flash Codes
Status LED
Description
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
1. Run capacitor has failed (may not be bad, verify)
2. Low line voltage (contact utility if voltage at disconnect
is low)
•
3. Excessive liquid refrigerant in compressor
4. Compressor bearings are seized
•
1. Outdoor unit power disconnect is open
2. Compressor circuit breaker or fuse(s) is open
3. Compressor contactor has failed open
•
•
•
•
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
•
Subject to change without prior notice
Status LED Troubleshooting Information Solution
Check wiring connections
Measure compressor oil level
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
Check compressor motor winding resistance
SM Series Heat Pump
SM Series Heat Pump