Bosch WT Series - Comfort Alert Module Flash Codes; Flash Codes 5-7; Flash Codes 8-9

24 | Troubleshooting WW & WT Models
WW & WT Models8733943362 (2016/08) Subject to change without prior notice
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
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