Bosch HP270-2 - Troubleshooting - Code E09; E09 - Lock Out Error (High Pressure Circuit)

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Code E09 – Lock Out Error (reset by pressing OK for more than 3 sec)
Fault in High Pressure circuit side
SW HPAF0501 / 0701 – Lock out (electrical heater backup needs manual activation after reset in case of error persist)
SW > HPAF0502 / 0702 – Lock out (automatic electrical heater backup activation to ensure minimum 40ºC of hot water)
Failure in High Pressure Side:
Compressor in Operation < 30
min before lock out
Yes
No
High Pressure Switch Activation
due to absence of water flow
through condenser
End
Circulation Water Pump is in
operation?
Pump operation is
normal?
Ensure that Impeller of
circulation pump is not
blocked (open front screw)
Impeller of circulation
pump is operative?
Check if pump connection
is plugged / measure
electrical input.
Purge air from sanitary
circuit
No
Measure Resistance:
Speed 1 ≈ 600 Ω
Speed 2 ≈ 450 Ω
Speed 3 ≈ 300 Ω
Yes
No
High Pressure Switch with
contacts permanently opens?
Safety elements not OK
Compressor thermal protection
with contacts open ?
Yes
Problem solved?
Measure continuity and ensure
contact in connection
No
Refer to spare part list
Problem solved?
Yes
No
Yes
Measure continuity and
ensure contact in connection
Compressor connections are ok ?
C – common
R – run
S – start
Yes
No