Bosch DOMESTIC HOT WATER HEAT PUMP Technical Manual page 48

Code E07 – Only for internal technical use
Code E08 – Only for internal technical use
Code E09 Lock Out Error
Failure in Compressor System
Condition: Appliance was turned on, is in standby and fault was displayed before operation
1 Contacts Open on safety elements - thermal protection
2 Contacts Open on safety elements – high pressure switch
3 Contacts Open on safety elements – low pressure switch
High Pressure Switch Activation
Condition: After first start up of system, fault is displayed after HP start operation
4 Water pump operation is noisy
5 Circulation pump is not working
Condition: Appliance blocks after some running time
6 Water flow through condenser is too low
7 Water shortage >12h
8 After a repair and / or R134 replacement
Code E10 Lock Out Error
Fault in the electrical backup resistance (by current sensor in control unit)
1 Activation of the safety thermostat (over temperature)
In case of repetitive error, drain water and disassemble
2
resistance.
Code E11 Lock Out Error
Failure in Compressor System
Condition: Appliance was turned on, is in standby and fault was displayed before operation
1 Contacts Open on safety elements - thermal protection
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6720649497 SM HP270-1 2012/09 en
Check Continuity
Check Continuity
Check Continuity
Check air presence in the sanitary side / pump
and purge it
Check pump connection and its operation -
Unblock the pump impeller through the front
screw.
Check eventual calc or debris deposition in the
sanitary side of the condenser plate heat
exchanger and clean it.
Too much refrigerant inside circuit (max. 375 g).
Rework charging procedure.
Reset thermostat manually
(check adjusted temperature – must be at
maximum position "+" aprox. 80ºC)
In case of appliance with internal coil, check
water temperature from the backup system
(solar, boiler, ...) – must be < 80ºC
Calc deposition over resistance surface avoids
thermal dissipation and consequent over
temperature detection.
Resistance malfunction.
Check Continuity