Troubleshooting - Bosch Ascenta SHX3AM Repair Instruction

6.3

Troubleshooting

6.3.1 Protection of heater if there's no water
Two NTC's protect the heater. Both NTC's are checked by the
control – if they overheat, the control shuts down the dishwasher
(E:08 fault code). The dishwasher shuts down if only one NTC
returns a signal (E:12 fault code) or if they show different values
(E:11 fault code).
6.3.2 Heat pump terminal measurements
There are two connectors, 7-pin and 3-pin.
6.3.2.1 7-pin connector (heater / NTC's / pump ground)
The 7-pin connector connects to the heat pump heater, NTC's
and ground.
Pump Motor
5
7 6 4 3 2
6.3.2.2 3-pin connector (3-pole BLDC motor)
The 3-pin connector connects to the 3-pole BLDC motor. The
power control module controls motor speed, starting and
stopping.
702_58300000130262_ara_en_b
7 – NTC 1
6 – NTC common
5 – NTC 2
4 – Line (hot)
3 – X1 (heater common)
2 – Neutral
1 – Ground
1
6.3.3 Drain pump
There is a single 3-pin connector, connecting to the 3-pole BLDC
pump motor.
Resistances as follows:
1 – 2: 89.6 Ω (@ 68 ºF)
2 – 3: 89.6 Ω (@ 68 ºF)
3 – 1: 89.6 Ω (@ 68 ºF)
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