Bosch HP270-2 Technical Manual page 50

Code E10 – Lock Out Error (reset by pressing OK for more than 3 sec)
Fault in the E-heater (detection by the current sensor in control unit: I < 6A)
The Thermostat is switching off
before HP reach set point
Refer to spare part list
and replace thermostat
The Thermostat is not switching
on the electrical heater element
Refer to spare part list
In case of need, drain tank and
clean E-heater, ensuring that
thermostat pocket is not
touching heating element
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and replace it
Attention: low water flow during LEG cycle due
to obstruction (scaling / fouling) in tank hose
adaptors and wrong bottom sensor position may
lead to overheating in tank
6-720-821-364 SM HP270 – 250 - 200 2016/12 en
Ensure thermostat is in maximum
position (aprox. 80ºC). Temperature
selector blocked in máx.
Problem persists?
Yes
Thermostat with wrong
calibration / Defective
Thermostat
Thermal Cut out activated (safety
thermostat) due to over temperature
Reset thermostat manually
Problem persists?
Yes
Possible defective E-
Heater – Measure
resistance (27 Ω)
Inspect reason for over-
temperature activation
Heating element
Ensure NTC top is
fully inserted
No
End
No
End
In case of HP with coil
connected to solar
ensure máx set point in
solar control of 70ºC
Thermostat Pocket