Page 56 from 56 6-720-821-364 SM HP270 – 250 - 200 2016/12 en
Code E16 – Lock Out Error (reset by pressing OK for more than 3 sec)
Detected an incorrect purge of hydraulic circuit during start up of electrical heater
(Note: NTC Tdis detect fast increase of temperature at start up of e-heater)
Code E17 – Lock Out Error* (reset by pressing OK for more than 3 sec) (HP 270-3)
Fan with insufficient rotation
Lock out (automatic electrical heater backup activation to ensure minimum 40ºC of hot water)
Code E18 – Lock Out Error (reset by pressing OK for more than 3 sec) (HP 200_250-1 / 270-3)
Incorrect position of discharge NTC temperature sensor (reading temperature after Electric Heater)
Error displayed only if E-heater activated for LEG / Anti-Freeze / backup during Combi Mode / E-heater Mode)
Bosch, Termotecnologia S.A
Aveiro Plant
Measure input signal to fan
(230 V is constantly supplied)
Ensure connection in control unit
Fan Blades with
dirtiness?
Remove volute to
inspect blades of fan
by cleaning it.
Correct position and ensure clip is inserted
and in contact with copper pipe
Air presence in hydraulic
circuit in module
Activate PURG function in SET mode
Purge using manual air vent between
pump and condenser
(Attention: water will exit by valve and
precautions are needed to protect
surrounded components)
Check circulation pump feedback
signal (parameter 10d > 50 Hz)
Incorrect feedback signal from
fan (see parameter 11d after
error reset with fan starting)
See 11d:
Speed 1 ≈ 30 Hz
Speed 2 ≈ 35 Hz
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