Bosch 15 SEER2 Series - C3 (Condenser coil sensor (T3) is seated fault in cooling); E6 (DC fan motor fault)

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Installation Instructions
Bosch 15 SEER2 Inverter Ducted Packaged Heat Pump - BTC 761701319 A (12.2022)
Error Code Description
C3 Condenser coil sensor (T3) is seated fault in cooling
E7 Compressor discharge sensor (T5) is seated fault
Table 28
Figure 45
C3 Condenser coil sensor (T3) is seated fault in cooling)
Diagnosis
Handling
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 34
No
Wire according to the
wiring diagram correctly
No
Replace the fault
T3/T4 sensor
No
Check whether condenser
coil sensor (T3) is seated
to the condenser coil
Reseat the sensor to
condenser coil
Yes
Check whether there is the
same fault
Keep running
No
Yes
Check whether there are
other heat sources around
T3/T4
Remove all the other
heat sources
No
Yes
Figure 46
E7 Compressor discharge sensor (T5) is seated fault)
Diagnosis
Handling
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
Tab le 34
and Table 35
Yes
Check whether there are other
heat sources around T3/T5
No
Wire according to the
wiring diagram correctly
No
Replace the fault T3/T5 sensor
No
Yes
Check whether there is the
same fault
Keep running
No
No
Check whether compressor
discharge sensor (T5) is
seated to the compressor
discharge line
Reseat the sensor to
discharge tube
Remove all the other
heat sources
Error Code Description
E6 DC fan motor fault
Table 29
If the E6 error code appears occasionally, no action is necessary. The
system will restart automatically after 6 minutes.
Figure 47
Check whether DC motor
wiring is reliably connected
according to the wiring
diagram
Reseat the wiring
according to
wiring diagram
Check whether outdoor coil
air return is blocked
Remove all the barriers
Replace the DC motor
NO
NO
NO
YES
YES
YES
YES
YES
Check whether DC motor
insulation resistance is
greater than 100KΩ
Check whether the resistance
of fan motor U2/V2/W2 are
normal
NO
Replace the DC motor
Replace the board and
check whether there is the
same fault.
Keep running
NO
Check whether there is the
same fault
Keep running
NO
YES
E6 (DC fan motor fault)
Diagnosis Handling