Hoover w/m, I have spent £80 on a timer to no avail, help!

[talkinghorse]

My Hoover Performa 1200 (model number AC 120-001) started playing up recently with the spin speed varying randomly and the wash quality deteriorating. Now it doesn’t wash at all as the drain pump runs all the time and it will not let any water in.

I suspected the timer unit and spent £80 on a replacement (from Whitegoods.co.uk of course) but nothing has changed. I have checked the level sensor, inlet valves and motor and they all seem OK.

Can anyone make any useful suggestions please?

[BFT]

Re: Hoover w/m, I have spent £80 on a timer to no avail, hel

Have you checked the tacho on the motor?

[Washman]

Re: Hoover w/m, I have spent £80 on a timer to no avail, hel

Hi

Have you checked motor brushes by removing them.

Mike

[Simon46]

Re: Hoover w/m, I have spent £80 on a timer to no avail, hel

Unplug Power before checking anything :zap:

Regards
Simon

[talkinghorse]

Re: Hoover w/m, I have spent £80 on a timer to no avail, hel

BFT wrote:Have you checked the tacho on the motor?

I took the motor off, checked the brushes (which were fine) and cleaned the comm (which also seemed fine but a bit dusty). Is the tacho a part of the motor or is it seperate?

[38159]

Re: Hoover w/m, I have spent £80 on a timer to no avail, hel

Assuming you have fitted the correct timer, pt no 91210807, and checked the motor, check inside the motor plug on the harness. It is quite common on these machines for the plugs to break down.

[Penguin45]

Re: Hoover w/m, I have spent £80 on a timer to no avail, hel

The drain pump can be activated by the flood protection level on the water level control switch. Worth investigating…… I hate to mention the possibility, but you may have dropped a stitch when changing the programmer over – double check your diagram for the wiring positions.

The tacho unit is the coil on the end frame of the motor with a magnet running the middle. If the circuit fails, the motor will either not run, or kick off once and then stop, depending on the econtrol circuitry. The carbon brushes should be at least 3/8″ long to maintain the circuit through the armature. Bear in mind that new brushes are about an inch and a half when new.

Power off when checking any of the above.

Regards,
Penguin45.

[talkinghorse]

Re: Hoover w/m, I have spent £80 on a timer to no avail, hel

Thanks for all the suggestions.

The brushes are well over an inch long but I’ll check the tacho and motor connector. However, the motor does run during the cycle so I think all those things will be OK. The problem is that the drain pump runs all the time and it won’t admit any water.

I did check the water level sensor and it seemed OK, giving one loud click for normal level sensing and then a very quiet one to close what I assume is the overfill alarm switch.

I’ll also double check the connections to the new programmer but the symptoms were exactly the same after changing it as they were before!

I’m away for the rest of the week now but if anyone has any more suggestions that would be great. Thanks.

[talkinghorse]

Re: Hoover w/m, I have spent £80 on a timer to no avail, hel

Hi All,

I have checked the tacho now and found that the resistance measures 5MOhms (5 meg). That sounds far too high to me, does anyone know what it should be or if this means it is definitely useless?

[talkinghorse]

Re: Hoover w/m, I have spent £80 on a timer to no avail, hel

It works at last!

The new tacho solved the strange speed variations of the drum.

As for the lack of water, that was my fault. When the wash quality deteriorated and the drum speed went a bit strange (caused by the faulty tacho as I now know), I thought the problem was being caused by my having exchanged the standard drain pump for a 100W pump which allowed the machine to pump water out of the cellar up into the downstairs toilet outlet. I therefore fitted a relay so the machine was only switching that instead of the drain pump direct.

Then having replaced the tacho and found it solved the speed issue I realised that it was most unlikely that there were 2 faults so I reconnected the drain pump directly and it worked!

Thanks for your help everyone!

Cheers,

Ed

[Author]

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