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Re: Bosch sms40t32uk/01 not heating
Final update, it’s fixed!
Desoldered the two largest relays and replaced em, good now. One of them I’m sure is functional, but I haven’t tested them yet, best replacing both for the sake of a couple quid.
Now anyone want a fully functional heating pump?
Re: Bosch sms40t32uk/01 not heating
Ran the eco wash, same, draw opens after 14 mins, continues cycle, rinses, drains, turns off as normal.
Re: Bosch sms40t32uk/01 not heating
Yep, it runs, opens the soap after a minute or so on quick, carries on, goes into the rinse cycle, I watch arm let the rinse aid out, drains, then turns off. All as normal, with no heating.
Running an eco cycle right now to double confirm.
Which one is the heater relay on the board?
Re: Bosch sms40t32uk/01 not heating
Ok, so I’ve had it apart again. Continuity test between all wires to and from the heating element/thermostat are OK. Pulled the pcb out and on inspection, it looks as new as the day it was manufactured. No scorch marks, no busted caps, no blown chips, no cracked Solder, nothing. Aside from sticking it in the oven for a reflow, I’m out of ideas.
Locally there’s nothing else that can affect this. Regardless I did inspect all the other wires as far as reasonably practicable.
Gave the relays a good tapping to see if any were stuck, I have my suspicions about which one is the heating element relay.
Observations: upon powering the machine, the middle red wire to the element receives 125v, this does not change during a cycle and stays till the machine is switched off. Is this a nominal voltage or should it get the full 230 when signalled to?
It appears to be component failure on the pcb, but what?
I refuse to have my ass handed to me by a dishwasher!
Re: Bosch sms40t32uk/01 not heating
I swapped the pump only on the basis that the thermostat appeared to be a part of it, and I wasn’t 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} on the resistances the entire circuit should have, but nothing jumped out as burnt and OC.
There were never ending posts and videos on the heater pump so I took a gamble since anything else would be more involved.
I will take it apart again and get a good look inside the box, just wanted some info in advance due to the faffing involved.
In hindsight I should have just taken the box to bits and looked inside. Been a busy few days though and what’s left of my brain is exhausted.
