Zanussi washing machine is not working & is displaying error code E91
I have a Zanussi washing machine, model number Z716WT83BI. Suddenly, it stopped showing any time for any of the washing options. Later, the machine just turns on and always shows a line for the reset option. When I try to change the mode and turn the dial a few times, it goes off automatically. The power supply seems fine, as the machine powers on and doesn’t trip the fuse board. The error code shows E91.
As per Zanussi it is a communication errors and I powered from fudge board and from wall socket still no luck. Could you please guide me with this? Thanks
WhatsApp Video 2025-08-20 at 01.44.29.mp4
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.
Zanussi Z716WT83BI showing E91 communication fault and shutting off
- The problem
- Zanussi washing machine Z716WT83BI stopped showing programme times, then would only show a line/reset indication and switch off when the selector was turned. The supply appeared present because the machine powered on and did not trip the consumer unit. The displayed fault code was E91.
- Likely cause
- Most likely a communication fault between the display PCB and the main PCB, or a problem with the wiring/connectors linking them. The discussion says this could be the control panel PCB, the main PCB, both boards, or the interconnecting plugs/wiring. The exact failed part was not confirmed.
- What fixed it
- The accepted advice was not to guess by replacing boards at random. The most strongly supported next step is inspection of the connecting wires and block connectors between the display PCB and main PCB, followed by proper diagnosis of the communication fault. Further diagnosis should be carried out by a suitably qualified appliance engineer.
- Checks to try
- Machine powered on
- Supply checked from fuse board and wall socket
- Fault code E91 observed
Safety: Do not replace control boards by guesswork. Further diagnosis should be carried out by a suitably qualified appliance engineer.
1 Answer
My old Zanussi error code book doesn't even list an E91 error. However, when an error code says communication error there's little you can do. There is a display PCB and a main PCB with wires and connectors between them. For some reason the two PCBs can't communicate with each other. So, it could be a fault on the control panel PCB, a fault on the main PCB, a fault on both, or a connection fault on the wires and block connectors that go between them. Just ordering and replacing either of the PCBs is asking for trouble and pure guesswork that could easily end up wasting a lot of money.
Even a Zanussi engineer is unlikely to be able to work out what it is. They would be most likely to just order both boards if it was under any sort of warranty or cover. They would then fit the easiest PCB to replace and if it fixed it sweet. If not, they would fit the other and then panic if that didn't work either. A good engineer might inspect the connecting wires and connectors first. If the machine was not under any warranty they would as likely as not just say it isn't worth repairing.
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