Low Pressure Switch Open (P6/J6) - Bosch Climate 5000 Series Service Manual

Service Manual

8.20 Low pressure switch open (P6/J6)

Error Code
Malfunction decision conditions
Supposed causes
Table 43
Troubleshooting:
Figure 63
Bosch Thermotechnology Corp. | 04.2020
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit | 65
J6/P6
If the sampling voltage is not 5V, the LED displays a failure code.
Wiring mistake
Overload protector faulty
System block
Outdoor PCB faulty
Lo w p r e ssu r e p r o t e ct io n enabled
A re the low pre ssure
A re the low pre ssure
prote ctor a nd m a in control
prote ctor a nd m a in control
boa rd wire d prope rly?
boa rd wire d prope rly?
Yes
Is the low
Is the low
pre ssure prote ctor
pre ssure prote ctor
broke n?
broke n?
Method: Disconnect the connection
ethod:
Measure the resistance of the
Measure the resistance of the
low pressure protector. I f the
low pressure protector. I f the
protector is norm al the value is
protector is norm al the value is
0. Does a problem still exist?
o. Does a problem still exist?
Yes
Is the outdoor a m bie nt
Is the outdoor a m bie nt
te m pe ra ture too low?
te m pe ra ture too low?
No
Is t h e v a lv e co r e o f t h e
Is t h e v a lv e co r e o f t h e
h ig h p ressu re v a lv e fu lly
h ig h p ressu re v a lv e fu lly
o p e n e d ?
o p e n e d ?
Yes
I s the indoor fan running
I s the indoor fan running
properly in cooling m ode?
properly in cooling m ode?
Yes
R e p la c e o u td o o r m a in PCB
D o e s a p ro b le m s till e x is t?
D o e s a p ro b le m s till e x is t?
No
Vacuum the system and
weigh-in refrigerant as per
the system requirement
R e co n n e ct t h e lo w p r e ssu r e
e co n n e ct t h e lo w p r e ssu r e
No
p r o t e ct o r a n d m a in PCB
No
Replace low pressure protector
Replace low pressure protector
Yes
St o p t h e u n it
St o p t h e u n it
O p en th e v a l v e c o re o f th e
O p en th e v a l v e c o re o f th e
No
h i g h p ressu re v a l v e
h i g h p ressu re v a l v e
Refer to the solution to the m alfunction
Refer to the solution to the m alfunction
of fan speed being out of control. Find
No of fan speed being out of control. Find
the cause and resolve the problem .
the cause and resolve the problem .
Data subject to change