AEG 64840L Error 40 (is not door catch)
My AEG 64840L shows Error 40. Intensive Googling indicates door switch. I have changed the door switch and checked that the door signal is received at the PCB, an EWM2100. I found one broken wire to the main motor plug , red wire goes to pin 8, J7 on PCB. Re attached, still no go. Motor brushes are perfect. I changed the PCB. The drain pump works fine when the overflow float is raised. If I disconnect the door switch - E52 appears as a fault. I am unsure now what E40 refers to. Does anyone have the correct Error codes or have any advice?
Solution Summary
AI-generated from this discussion
This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.
AEG 64840L showing E40 with no confirmed DIY fix
- The problem
- AEG 64840L washing machine displayed E40. The door switch was replaced, the door signal was checked at the EWM2100 PCB, a broken red wire to the main motor plug/pin 8 J7 was reattached, and the PCB was changed, but the fault remained. The drain pump operated when the overflow float was raised. Disconnecting the door switch produced E52.
- Likely cause
- The discussion supports that E40 was not clearly identified from the available code list, and the accepted reply notes that nearby door-lock related faults can also be caused by wiring or the main PCB. E52 was identified in an older code list as no signal from the motor tachometer generator, with possible causes including motor, wiring or PCB faults. The exact cause of this machine's fault was not confirmed.
- What fixed it
- No confirmed repair was provided. The accepted advice was that these AEG/Zanussi error codes can cover multiple faults and are not reliable for speculative part replacement. Further diagnosis should be carried out by a suitably qualified appliance engineer.
- Checks to try
- Door switch replaced
- Door signal checked at the EWM2100 PCB
- Broken red wire to main motor plug reattached to pin 8, J7 on PCB
- Motor brushes checked and reported perfect
- PCB changed
- Drain pump tested by raising overflow float
- Door switch disconnected, after which E52 appeared
- Parts or tools mentioned
- Door switch
- EWM2100 PCB
- Main PCB
Safety: Further diagnosis should be carried out by a suitably qualified appliance engineer.
2 Answers
My AEG error code list, which is quite old now, shows E41 as possible faulty door lock. E40 isn't even listed. Not much help but there it is. My advice with many of these error codes is to get an engineer in. With AEG and Zanussi in particular using error codes that implicate far too many possible faults for DIY repair. For example the Error 41 I have listed says -
"Door unlocked: Door lock faulty, Wiring faulty, Main (PCB) board faulty, Cycle is paused start"
That's way too many possibilities to start speculatively changing parts. It's OK if you are an AEG engineer and have all the parts on your van to try. But buying them - especially the main PCB is just way too much of a gamble, as unfortunately you've found
My book (10 years old now) says E52 is -
"No signal from motor tachometer generator: Motor faulty, wiring faulty, PCB faulty, Cycle blocked, door locked (after 5 attempts) OFF/reset"
As you can see, most unhelpful. It's even a pain for engineers.
Here's what I think about appliance error codes - Appliance Error codes – What You Need to Know
Need Professional Help or Spare Parts?
Thanks for that. I came to the conclusion the code meant little. I've had S/H parts from Ebay so little expense incurred yet. I'll post again if I find it - it's a challenge.
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