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Re: Baffled by Hotpoint WMA10
I have a wma33 it appears to have the same pcb panel that looks like it was designed by a mountain goat so as to blow up at the slightest excuse.
went to visit my newborn at the hospital and left machine on, came home and the mains fuse has tripped. reset and the washer door interlock light is flashing and inoperative. Had to get it running or the missus would have killed me lol.
no diagrams, nothing online worth a look except this thread. had to reverse the whole pcb panel and door interlock circuit ffs.Door interlock wires 2 white 1 red. power is applied by a triac from the front pcb which had a nice hole in top of it 😕
1 white is neutral and 1 is the feedback to pcb, red is live switched by the triac, dissasembly of door interlock shows PTC required cleaning ect. did that reassembled and tested function.
test pads on main pcb to jump out triac for a test mode presumably, operated as such anyway, removed triac prior to test as it was obviously dead short.
Replaced all tracks on pcb that were total blown away (who came up this pile of poo ffs).
interlock operated when program selected, downside while doing this one must switch of from socket to release the door
started machine on a test cycle and trips fuse hmm further checks revealed carbon deposits on terminals to motor, removal solved tripping.
Cycles completed after this fine.fitted replacement triac, driver transistor and a resistor and the machine is working again without issue.
Normally i work on more complex devices, but my only coment further is that i am staggered at the cost of these panels and the quite deliberately poor design.
The best they could come up with was a bimetal reaction using a PTC to permit movement of a little piece of plastic to inhibit the door release, hotpoint/creda area bunch of cowboys. 10quids worth of parts, an eeprom to load any program they want so the board design is compatible with almost all models by adding leds and changing programs. for that they want £100 +.last hotpoint/creda type machine i ever purchase. hmm
Re: Baffled by Hotpoint WMA10
That same door interlock design is used industry wide, its not a Hotpoint/Creda part. Some manufacturers do use a better one but I would guess that 75{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} of machines on the market have something similar or even identical.
In the past Hotpoint used a fast blow fuse to protect the electronics, I repaired a motor on one only last week, the motor armature had gone down. It took out the glass fuse but the electronics were untouched, it was 22 years old BTW.
Doorlocks, motors, pumps and heaters take out PCB’s on a wide range of machines, a lot of Zanussi PCB’s have gone pop recently, happens on Bosch machines and the PCB on those is silly money.
That PCB does not require a smartcard to programme it. All that malarky is down to the Indesit Company and the later machines, if you think the WMA is bad you should see the Indesit based machines. :rolls:
I would guess by the model number that it is around six or seven years old at least.
Most sub £350 machines on the market today will last about half of that.
A new doorlock is quite cheap and might be worth investing in. 😉
Re: Baffled by Hotpoint WMA10
iadom wrote:
‘If’ the plug was in the ‘wrong way round’ all that would happen is that you would get a live feed to the open switch side of the door lock,which would not therefore activate. No damage to the PCB would occur
I had a WMA10 do the exact same thing a few days ago… I replaced the bearings and put the whole machine back together again, and assuming, as one would, that the plug will only insert one way, I inserted the plug and switched on for test.. only to find the door lock flashing and then a cracking sound as our friendly little triac for the door swich decides to have an argument with the wiring… I checked what was wrong and sure enough I had pushed the plug in the wrong way round. 😳 😥 👿
Re: Baffled by Hotpoint WMA10
iadom wrote:
A new doorlock is quite cheap and might be worth investing in. 😉
Indeed it is, I took the pcb repair and blown tracks as an opportunity to correct some of my perceived flaws lol. particularly the no fuse on the door interlock, it is well know that PTC do get buildups than can cause momentary shorts usually knocks a piece off the PTC itself. i used a fibre pencil to clean it and its contacting area’s. if it fails again i will replace the interlock, but in all honesty it does not appear to be at the end of its life by any means lol.Re: Baffled by Hotpoint WMA10
by iadom »
In the past Hotpoint used a fast blow fuse to protect the electronics, I repaired a motor on one only last week, the motor armature had gone down. It took out the glass fuse but the electronics were untouched,Thought it would be a good idea to retrofit a fuse.Can you remember where it was fitted and the amperage.Thanks.
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