Bosch BOVA Series - F1 ( High Pressure Switch(HPS) Fault); E7 Compressor Discharge Sensor(T5) Is Seated Fault); E6 DC Fan Motor Fault); C3 Condenser Coil Sensor(T3) Is Seated Fault in Cooling)

Installation Instructions Bosch IDS BOVA | 31
Bosch Thermotechnology Corp. | 12.2016
Data subject to change
F1 ( High pressure switch(HPS) fault)
Diagnosis
Handling
Yes
Yes
Check whether the
resistance of HPS is close to
0KΩ
No
No
Replace high pressure
switch
No
Check whether the service
valves are open
Open the service valve
Check whether high pressure
switch(HPS) wiring is seated
and normal
Wiring according to the
diagram correctly
Yes
Yes
Check whether there is the
same fault
Keep running
No
Figure 55
Error Code Description
C3 Condenser coil sensor(T3) is seated fault in cooling
E7 Compressor discharge sensor(T5) is seated fault
Table 19
C3 Condenser coil sensor(T3) is seated fault in cooling)
Diagnosis
Handling
Yes
Check whether the sensor of
T3/T4/HPS are connected
according to wiring diagram
Yes
Check whether the
resistance of T3/T4 is in
the range of Table 1
No
Wiring 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
Reseatthesensorto
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 56
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
Tabl e 1 a n d Tab l e 2
Yes
Check whether there are other
heat sources around T3/T5
No
Wiring according to the
wiring diagram correctly
No
Replace the fault T3/T5 sensor
No
Yes
Check whether there is the
same fault
Keep running
Yes
Remove all the other heat
sources
No
Check whether condenser coil
sensor(T5) is seated to the
condenser coil
Reseat the sensor to
discharge tube
Figure 57
Error Code Description
E6 DC fan motor fault
Eb System lockup, 2 times (E6) protection in 10 minutes
Table 20
When E6 appears occasionally, you don`t need to do anything, the system will restart
automatically after 6 minutes, of course, if you check the system of running, it will be
better. When Eb appears, you need to check the motor.
E6 DC fan motor fault)
Eb System lockup, 2 times (E6) protection in 10 minutes)
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 P8 and P2
Yes
Check whether there is
the same fault
Reseat the wiring
according to wiring
No
Remove all the barriers
No
Replace the control board
No
Keep running
NOTE: Just for 4T/5T
No
Yes
Figure 58