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Applications Manual
17.4.1 CADM Flash Codes (Table 33)
Troubleshooting Information Solution column
may re ect a possible fault that may be one of,
or a combination of causes and solutions. Check
each cause and adopt "process of elimination"
and or veri cation of each before making any
conclusion.
CADM Flash Codes and Solutions
Status LED
Status LED description
Short Cycling -
Yellow "ALERT" Flash
Compressor is running
Code 3
only briefly
Yellow "ALERT" Flash
Locked Rotor
Code 4
Yellow "ALERT" Flash
Open Circuit
Code 5
Open Start Circuit -
Yellow "ALERT" Flash
Current only in run
Code 6
circuit
Open Run Circuit -
Yellow "ALERT" Flash
Current only in start
Code 7
circuit
Yellow "ALERT" Flash
Welded Contactor -
Code 8
Compressor always runs
Yellow "ALERT" Flash
Low Voltage -
Code 9
Control circuit < 17VAC
Tab. 33
Bosch Thermotechnology Corp.
Status LED Troubleshooting Information Solution
1.
Thermostat demand signal is intermittent
2.
Time delay relay or control board is 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)
- Check wiring connections
3.
Excessive liquid refrigerant in compressor
4.
Compressor bearings are seized, measure compressor oil level
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
1.
Run capacitor has failed (may not be bad, verify)
2.
Open circuit in compressor start wiring or connections
- Check wring and connectors between supply and compressor "S" terminal
3.
Compressor start winding is damaged
- Check compressor motor winding resistance
1.
Open circuit in compressor run wiring or connections
- Check wiring and connectors between supply and compressor "R" terminal
2.
Compressor run winding is damaged
- Check compressor motor winding resistance
1.
Compressor contactor has failed closed
2.
Thermostat demand signal not connected to module
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 LED's flashing at the same time
means control circuit voltage is too low for operation
Bosch Geothermal Heat Pumps | 111
Data subject to change
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