[Hitcher1970]

Re: Hotpoint WMD960 Error Code F10 – Pressure Switch Advice

Hi Mitch

Yes, I’ll keep you posted on any developments.

Best Regards

Neil

[Hitcher1970]

Re: Hotpoint WMD960 Error Code F10 – Pressure Switch Advice

Hi Mitch

Thanks for the enquiry.

As per the discussion above, I installed the replacement pressure switch to test the machine but as anticipated, this did not solve the problem.

I carried out a detailed check of the pipe which connects from the pressure chamber to the switch and this was clear.

I also checked the continuity of the wiring from both the pump and the pressure switch to the PCB unit which sits in the recess at the bottom left of my machine (as viewed from the rear of it) and this checked out fine, as did the condition of all the connectors onto the board.

Since then I have extracted the PCB unit from the machine (a bit of a fiddle but much easier if you can ease off the white plastic cowling first) and in the next couple of days, Im going to remove and test the two power relays local to the pump wiring connector to see if they’ve failed.

Hope that’s of some help.

Regards

Neil

[Hitcher1970]

Re: Hotpoint WMD960 Error Code F10 – Pressure Switch Advice

iadom

Thanks for the update and advice.

I was wondering if the PCB was going to be suggested as a possible cause of the fault.

I have just ordered a cheap but working pressure switch as per your part number advice and if that fails then I’ll have to extract the PCB and see if I can work out whether there has been a component failure or otherwise.

Will keep you posted and thanks again for the help.

Regards

Neil

[Hitcher1970]

Re: Hotpoint WMD960 Error Code F10 – Pressure Switch Advice

iadom

Thank you for the prompt reply and advice about the switch.

As requested, here are the details of our machine in full:

Hotpoint Ultima WMD960P
905120207 (Presumably the serial number)
Also noted: 54728 (Lot / week number?)

Further markings stamped on the circumference of the pressure switch for your reference:

505GU201
145-120-307
160022665.00

Regarding your advice about the terminals / contacts on the pressure switch, here are my findings, further to carrying out some measurements:

11 to 12 is S/C when switch ‘at rest’ (i.e. no air pressure)
11 to 14 is O/C as per above
12 to 14 is O/C as per above
11, 12 or 14 to 16 is O/C as per above

When pressure is applied to the tube on the switch, the states are as follows:

11 to 12 is O/C
11 to 14 is S/C
12 to 14 is O/C
11, 12, or 14 to 16 is O/C

Therefore, it looks like 11, 12 and 14 are operating together as a standard SPCO switch but based on your comments about the Overflow terminal – which is presumably the one marked ’16’ – the operation of the switch seems to have no effect on its state when referred to the other terminals so it safe to assume that overall, the switch is currently serviceable?

In any case, any advice on how to proceed with the repair will be appreciated.

Thanks and regards

Neil

[Author]

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