Bosch 19 SEER Series Operation Manual page 29

Installation & Operation Manual
Error Code Description
P0 High module radiator temperature (TF) protection
Table 19
P0 (High module radiator temperature (TF) protection)
Diagnosis
Check for dust or debris
blocking radiator
No
Check whether the Tf is
normal according to Table 28
(between temperature and
resistance)
Yes
Restart system and check
whether the fan and motor
can operate normally
Yes
Operate system and check
whether there`s the same fault
Yes
Figure 34
Error Code Description
P2 Low pressure (PT) Protection in cooling and heating
H5 System lockup, 5 times (P2) protection in 100
P4 High compressor discharge temperature(T5)
Table 20
P2 (Low pressure (PT) Protection in cooling)
H5 (System lockup, 5 times (P2) protection in 100 minutes)
Diagnosis
Do superheat and subcooling
meet required values? (Refer
to section 14 system charge
adjustment)
Yes
Is the blower fan motor
working properly? Is there any
blockage on filter? Are the EEV
and outdoor fan motor working
properly?
Yes
Is the pressure transducer
working properly? Compare
the data between pressure
measurement and
No 9 (cooling) or
No 10 (heating) values
(by press check button).
Yes
Figure 35
BTC 761701105 A | 03.2019
Handling
Clean all the dust
Yes
and debris
No
Replace Tf sensor
No
Replace the fan and motor
No
Operate normally
Handling
No
Adjust charge
No
Fix all these and restart
the system
No Replace the pressure
transducer
Bosch Inverter Ducted Packaged Heat Pump | 29
P4 (High compressor discharge temperature (T5) protection)
Diagnosis
Check whether the T5 is normal
according to Table 28 (between
temperature and resistance)
Yes
Check whether outdoor and
indoor unit motor is abnormal
or whether coils (outdoor and
indoor) are blocked
No
Check whether the charge is
correct by subcooling
according to installation guide
in charge mode when cooling
Yes
Check whether the EEV is
normal for throttle
(wire seated coil)
Yes
Check whether the compres-
sor is normal (abnormal noise,
abnormal vibration)
Yes
Figure 36
Handling
No
Replace the T5 sensor
Yes Replace the fan or
remove all the barriers
No
Adjust the charge
Re-power and check
No
again,if the same, replace
the EEV.
No
Replace the compressor
Data subject to change