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Hi,
I’m extremely new to this forum. I did a search and couldn’t find any direct answer to this – but apologize in advance, if it is a FAQ.
I’m looking for pinouts and info on fault-finding a pressure switch from a Hotpoint WD62. The pressure switch identifies itself as METAFLEX HD505.
It has 4 connectors 1,2,3 and 4. Ratings are given for contacts 1-2, 1-3, and 1-4. So I assume that these are the contacts.
I’ve tested the unit by fitting a tube to the inlet and blowing/sucking while measuring continuity. I presume they’re all contacts and no relay coils – there’s only 4 to play with.
I’m getting constant S/C across 1-3 and O/C on 1-2 regardless of pressure. 1-4 seems to work as expected (normally open and closes when I blow up the pipe).
Is this dead ?
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You’re probably ask why I’m testing the presure switch, so here’s the full story (in case anyone’s interested).
Machine is Hotpoint WD62 washer-drier 4 yrs old.
Fault is no (fast) spin.The motor turns. The programmer goes through the complete wash cycle, but on spin will remain at distribution speed.
Brushes are fine – new set fitted.
Field windings and armateur are ok (not O/C).
Removing pipe from pressure switch has no effect.
Blowing or suching on a spare pipe fitted to pressure switch during spin has no effect.
If tacho is removed (physically) from end of motor, it spins!So – it’s got to be either the pressure switch or the combined progammer/speed control PCB.
… Or which wire do I disconnect to tell the controller that the drum IS empty and it’s OK to spin ??
Am getting very desperate. I thought it might have been the programmer and have waited 3 days only to be let down by a supplier. As it turned out, he thought I wanted the dryer timer! (And I thought £30 was the exchange price). Misses isn’t amused and it’s very cold for sleeping out in the doghouse 😉
Thanking you all in advance
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SteveRe: Pinouts / faultfinding for Hotpoint pressure switch ?
Hi Steve
….yess….duff press s/w…contact 1-2 should be made normally, moving to 1-3 under pressure, then returning on release of pressure!
Not a particularly common fault but easily (and cheaply) rectified.
Don’t forget to unplug!!!
CliveRe: Pinouts / faultfinding for Hotpoint pressure switch ?
clivejameson wrote:
….yess….duff press s/w…contact 1-2 should be made normally, moving to 1-3 under pressure, then returning on release of pressure!
Not a particularly common fault but easily (and cheaply) rectified.Thanks, Clive! That’s brilliant. 😉
I was almost sure, but your confirmation is just what I needed.My next problem is finding one quick! I’m even tempted to put the machine back online without the spin – still better than hand-washing.
Thanks again!
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SteveSteve,
Do NOT put the machine back into service. It thinks it’s already full of water, so the heater will blow pretty damn quick – it’s an immersion type only!!P/switch number is 1602564, Dave Conway will be able to sort you one out quite promptly.
You could try giving the switch a sharp tap with a plastic screwdriver handle – the contacts may free up – BUT – if they’ve jammed once, they WILL do it again.
Whatever you do, pull the plug first……
Regards,
Penguin45.Re: Pinouts / faultfinding for Hotpoint pressure switch ?
I’ve just checked the Hotpoint part disk and it turns out there are a possible two pressure switches on this model dependant on the serial number.
Steve, let me have the serial number from the label stuck inside the door please.
Dave.
Re: Pinouts / faultfinding for Hotpoint pressure switch ?
You’ve also got to ask yourself why the pressure switch failed in that way. The heater element could have gone down to earth. It’s happened to me. Worth insulation testing the element before fitting a new pressure switch.
Don’t forget to……..etc…..Dave
Penguin45 wrote:Steve,
Do NOT put the machine back into service. It thinks it’s already full of water, so the heater will blow pretty damn quick – it’s an immersion type only!!{snip}
You could try giving the switch a sharp tap with a plastic screwdriver handle – the contacts may free up – BUT – if they’ve jammed once, they WILL do it again.
The contacts were stuck. A very sharp wack got them unstuck. Tested the machine using a tube and my mouth instead of water and it worked fine. Machine now back online and we’re watching it lilke hawks 😉 Thanks Penguin45 – you really saved my butt whis weekend, we were beginning to handwash… Now off to get a new switch.
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SteveRe: Pinouts / faultfinding for Hotpoint pressure switch ?
AMS wrote:You’ve also got to ask yourself why the pressure switch failed in that way. The heater element could have gone down to earth. It’s happened to me. Worth insulation testing the element before fitting a new pressure switch.
Hi Dave, thanks for that.
Given that the switch is now unstuck, and the machine is working – we can probably presume that the heater hasn’t gone down to earth. I haven’t got a megger, but when I find someone who has, it might be worth a quick check.
I used to be a hardware/software engineer – but now I only work with software, so laying my hands on test kit and bits of hardware is not so easy.
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Steve
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