Bosch 19 SEER Series Operation Manual page 31

Installation & Operation Manual
Error Code Description
C3 Condenser coil sensor (T3) is seated fault in cooling
E7 Compressor discharge sensor (T5) is seated fault
Table 22
C3 Condenser coil sensor (T3) is seated fault in cooling)
Diagnosis
Check whether condenser
coil sensor (T3) is seated
to the condenser coil
Yes
Check whether the T3/T4
sensors are connected
according to wiring diagram
Yes
Check whether the
resistance of T3/T4 is in
the range of Table 27
Yes
Check whether there are
other heat sources around
T3/T4
Yes
Check whether there is the
same fault
Yes
Figure 40
BTC 761701105 A | 03.2019
Handling
No
Reseat the sensor to
condenser coil
Wire according to the
No
wiring diagram correctly
No
Replace the fault
T3/T4 sensor
No
Remove all the other
heat sources
No
Keep running
Bosch Inverter Ducted Packaged Heat Pump | 31
E7 Compressor discharge sensor (T5) is seated fault)
Diagnosis
Check whether compressor
discharge sensor (T5) is
seated to the compressor
discharge line
Yes
Check whether the sensor of
T3/T5 are connected accord-
ing to wiring diagram
Yes
Check whether the resistance
of T3/T5 is in the range of
Table 27 and Table 28
Yes
Check whether there are other
heat sources around T3/T5
Yes
Check whether there is the
same fault
Figure 41
Error Code Description
E6 DC fan motor fault
Table 23
If the E6 error code appears occasionally, no action is necessary. The
system will restart automatically after 6 minutes.
E6 DC fan motor fault)
Diagnosis
Check whether DC motor
wiring is reliably connected
according to the wiring
diagram
Yes
Check whether outdoor
coil air return is blocked
Yes
Check whether there is
15V DC between the test
point P & N
Yes
Check whether there is
the same fault
Yes
Figure 42
Handling
No
Reseat the sensor to
discharge tube
No Wire according to the
wiring diagram correctly
No
Replace the fault T3/T5 sensor
No
Remove all the other
heat sources
No
Keep running
Handling
Reseat the wiring
No
according to
wiring diagram
No
Remove all the barriers
No
Replace the control board
No
Keep running
Data subject to change