Bosch BRBA-36HWD1N1-M18 - Page 32

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703103 A (11.2022)
Error Code Description
C3 Condenser coil sensor (T3) is seated fault in cooling
E7 Compressor discharge sensor (T5) is seated fault
Table 26
Figure 43
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 44
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 27
If the E6 error code appears occasionally, no action is necessary. The system will
restart automatically after 6 minutes.
Figure 45
E6 DC fan motor fault)
Diagnosis Handling
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
Reseat the wiring
according to
wiring diagram
No
Remove all the barriers
No
Replace the control board
No
Keep running
No
Yes