Bosch Maxx 6 – all lights flashing

[electrofix]

gen part number for pressure sw is here

when the unit fails what is it trying to do

i assume it heats ok

Dave

[Andrew__F]

Hi Dave, that’s a good point re the heating – it might be tripping when the heating cycle starts. I replaced the heating element last year when it had obviously failed (used to trip the ring main circuit breaker when the heating cycle started). Hadn’t considered it was faulty because it’s reasonably new – might be worth removing it to check. Just a resistance check should do it? I’m assuming normal resistance is 20-40 ohms.
Didn’t see a link for the pressure sw – did you link to it?
Thanks for your help.

[electrofix]

sorry missed it

https://www.bosch-home.co.uk/support…on-spareparts/

try disconnecting the heater, both wires and see what happens also check wires to temp sensor

Dave

[Andrew__F]

Yep that pressure sw looks different to mine – if it is that, I hope the connectors are the same.. will try heater first though.
When you say disconnect the heater and see what happens – do you mean to try to run it with the heater disconnected? And the temp sensor wires – check that they are connected properly, no obvious breaks or looseness?
Thanks again Dave.

[Andrew__F]

My pressure switch is this one: https://www.buyspares.co.uk/product.pl?pid=2061229&utm_source=google&utm_medium=base&utm_campaign=products&gclid=CjwKCAiApNSABhAlEiwANuR9YDVQuaeMPtyhuEqriGeQgYhTzJBxgJO5whG005bHBn6J1Wf7QwNwlBoC0CUQAvD_BwE

[electrofix]

correct machine will work with no heater but programmes will be extended

you can check that sort of pressure switch with a meter you can also blow into to it and hear it click. the modern switches are more accurate but impossible to test

Dave

[Andrew__F]

Update – disconnected the heater. Checked resistance – 29 ohms – happy with that. Blew into pressure switch – audible click, and checked contacts with multimeter – open circuit normally; closed circuit when blown into.
Started cycle – synthetic 30 deg express wash – ran for 13 minutes, stopped all lights flashing!
Running out of ideas now – any more pointers Dave? Temp sensor at heater? Of interest – am I able to calculate the age from the serial number – trying to decide now if I should call it quits! Appreciate your help – thank you.

[electrofix]

look at FD no

first 2 digits plus 20 =year
next 2 are a month

check wires from heater sensor and make sure there are no breaks

Dave

[Andrew__F]

All checked – no breaks visible.

[electrofix]

out of ideas now

Dave

[Andrew__F]

Yep, me too – stumped. I had a service engineer from our local whitegoods supplier come out to review. Obviously it behaved when he was here, and ran fine. He noted that the heater relay on the control board seemed to be problematic – perhaps sticking on for longer than it should, and this was leading to the machine trying to lower the temperature by adding more cold water (?)
It’s run a couple more times without problems (30 deg cottons wash – express) but stopped again this morning all lights flashing. Seems to be more of a control board than a hardware issue, so might just have to send it to scrap and replace in the absence of any other ideas.
Thanks for all the help Dave – really appreciated.

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