I have a few references to the Hoover error 8, they are listed for the Hoover Vision HD series washing machines, Hoover 3 phase autowashers and the Hoover Nextra and Optima models.
References vary slightly but all point to a motor fault – possibly the tacho coil – However, also check for worn carbon brushes which have been reported by people in the comments section below to have fixed this fault. (See help for diagnosing worn brushes on any washing machine).
- Hoover Vision: Error 8 = Tacho fault
- Nextra: Error 8 = Motor jammed / Drum shaft jammed or tacho generator fault (This is the same description as for Nextra Error 7)
- Hoover 3 phase autowashers: Error 8 = Tacho generator out of circuit. Can be wiring or board
- Optima: E08 = Tacho fault
What is the tacho coil?
The tacho coil is on the motor and is fitted at the opposite end of the drive belt where the carbon brushes are. This error says something is wrong regarding the tacho coil but it doesn’t specify exactly what. Possibilities are varied so unless you know what you are doing, and unless you can see something obvious like the coil has come away from the motor or the motor or drum has seized up it is probably better to call in a professional.
Resistance readings for tacho coils are usually quite high, so if you don’t have a sensitive enough meter it could appear to be open circuit when in fact it’s reading over 150 Ohms or more and may be ok.
What does the tacho coil do?
In conjunction with a magnet fitted on the end of the armature shaft each time the motor does a revolution it can be counted by the software or pcb through the tacho coil. This information is used to judge and control the speed of the motor at all times.
If the coil is open circuit the washing machine would lose al control of the motor and in the past the motor would often spin uncontrollable causing damage to the washing machine. These days if an open circuit or missing tacho coil (they can fall off the motor) is detected the machine will stop working and report an error code.
Although the fault may be different to error 7 with some models, the Nextra model references the error 8 and specifically says its the same as error 7. Therefore it may be helpful to read the Nextra Error 7 description, which also gives more information about the tacho coil.
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