Bosch HP270-2 Technical Manual page 55

Code E13 – Lock Out Error (reset by pressing OK for more than 3 sec)
Incorrect position of Top NTC temperature sensor (reading of tank top temperature)
Note: detection done by NTC T dis > T top +30ºC during 3 min)
Sensor out of
position?
Code E15 – Lock Out Error (reset by pressing OK for more than 3 sec)
Circulation pump with insufficient rotation
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Correct position and ensure enter +/-
30 cm (until white sticker)
Pump is blocked?
Yes
Open pump by removing
motor from housing
Remove dirtiness from
pump blades
Check parameter 10d:
expected value > 50 Hz
6-720-821-364 SM HP270 – 250 - 200 2016/12 en
(HP 200_250-1 / 270-3)
Note: due to new bottom sensor
position, it is possible to detect if
top NTC is correctly placed
(only HP 270-3)
Measure input signal to pump:
Brown – White: 8 – 24 V dc
Measure feedback signal:
Yellow – white: 100 Hz