Bosch BRBA-36HWD1N1-M18 - Page 30

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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703103 A (11.2022)
Error Code Description
P0 High module radiator temperature (TF) protection
Table 23
Figure 37
P0 (High module radiator temperature (TF) protection)
Diagnosis Handling
Check for dust or debris
blocking radiator
No
Check if all screws are
properly installed and if
thermal paste is properly
applied
Yes
Clean all the dust
and debris
Yes
Follow board replacement
instruction for correct steps
Restart system and check
whether the fan and motor
can operate normally
Replace the fan and motor
No
No
Yes
Operate system and check
whether there`s the same fault
Operate normally
No
Yes
Error Code Description
P2 Low pressure (PT) Protection in cooling and heating
H5 System lockup, 5 times (P2) protection in 100 minutes
P4 High compressor discharge temperature(T5) protection
Table 24
Figure 38
P2 (Low pressure (PT) Protection in cooling)
H5 (System lockup, 5 times (P2) protection in 100 minutes)
Diagnosis Handling
Do superheat and subcooling
meet required values? (Refer
to Section 12 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 pressing the check button).
Adjust charge
No
Correct these issues and
restart the system
No
Replace the pressure
transducer
No
Yes
Figure 39
P4 (High compressor discharge temperature (T5) protection)
Diagnosis Handling
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 design subcooling
force mode when in cooling
Yes
Check whether the EEV is
normal for throttle
(wire seated coil)
Replace the fan or
remove all the barriers
Yes
Adjust the charge
No
Re-power and check
again,if the same, replace
the EEV.
No
Yes
Check whether the T5 is normal
according to Table 35 (between
temperature and resistance)
Replace the T5 sensor
No
Check whether the compres-
sor is normal (abnormal noise,
abnormal vibration)
Replace the compressor
No
Yes