- This topic has 22 replies, 3 voices, and was last updated 1 year, 9 months ago by
.
-
Posts
-
Last week our Bosch Tumble dryer stopped working. It would click a couple of times and then turn off. Managed to get a code out of it (E90). Took the power board out and found that one relay had blown (melted a hole through itself). I presume the relay switches power to the motor
Put a new relay in. CHecked the others in that bank and they seemed to buzz out fine. Reassembled dryer and seems to be working now in so much as it runs but it doesn’t seem to get that hot. You get a waft of tepid heat if you open the door mid cycle but I don’t know whether it’s working as intended as it’s the boss that uses it not me!The machine is plumbed in and so the condensate drains into the sink waste.
I noticed quite a lot of lint/fluff inside the machine when I had the top off and hoovered what I could reach.
I can get into the self test menu but I have no idea what Program tests what so I don’t want to mess around with that until I know what each one does.
I’ve also only had the top and fan cowl (looking to see if there was a reset button – there isn’t) off so I’ve no idea what lurks elsewhere.I’m wondering what the other relays control. The blown relay is the second inboard sitting beside the connector that the blue/white and red/white leads connects to (ie 2nd one from top left as it sits in the dryer). The relay above it could have sustained some heat damage as the corner is blackened but as I say – it buzzes out on the DMM OK. At £6 it’s no big deal to change but I just don’t want to wait another week to find it hasn’t cured the issue.
Is there anything else should I be looking at?
Does anyone have a list of the self test programs and what pre-requisites are for running them?
whirlpoolsucks wrote:The blown relay is the second inboard sitting beside the connector that the blue/white and red/white leads connects to (ie 2nd one from top left as it sits in the dryer). The relay below it could have sustained some heat damage as the corner is blackened but as I say – it buzzes out on the DMM OK.
EDIT to correct in Bold and underlined
since the machie is capable of 2 heats there are 2 relays controlling the element
on delicate fabrics only one element is energised but on cottons both are active
Dave
Hmm – no heater element on this tumble dryer. It’s a heat pump dryer so it’s just an evaporator and condenser. Maybe refridgerant loss or more likely condenser/evaporator blocked with lint/fluff. Looks like a complete strip down to get to the condenser/evaporator.
ah did no know that as i did not look it up. Heat pump are very different. its a de-humidifier in a box
all the heat in a heat pump dryer is waste heat from the compressor. the result is luke warm only and will never get hot. the important thing is both air flow and does the evaporator get cold so the water condenses
Dave
Thanks Dave – I think the issue is that it’s taking 2-3 cycles to dry everything. Looking at the amount of lint inside my guess is that the boss hasn’t been emptying the lint filter which leads me to suspect that this is a completely seperate issue and that she was having it before the relay blew. I’m sure that if the condenser fins are completely blocked with lint it’ll not be working efficiently. Trouble is to get to it, I think the drum has to come out!
ok
cant get any info on evaporator access. its supposed to self clean but to do this there has to be water in the draw which floods down to wash out fins in eveporator. dont know how it gets on if the water gets pumped away before it gets in the drawthink i would fill the water draw half full and do that a few times and see if it self cleans
if not the try to remove the lower front cover. some of thew clips may be accessible from underneath and see whats behind there. on some other self cleaning machines you can look down through the filter and see the evep fins and carefully pick off large bits of lint. be carefull as fins are very soft. Also on other machines you can cut out the panel in front of the evaporator and Bosch supplied a kit to re seal. not sure if your dryer is the same
Dave
Yes – there’s a bit you can cut out at the front of the machine behind the panel where the air inlet is. I saw a YouTube video of someone doing just that and dismissed it thinking it wasn’t right. I’ll take a look tomorrow
E90 is a power module fault and bosch sell a cleaning product for the self cleaning condensers and it tells you how to put it into service mode
Thanks [USER=”4209″]electrofix[/USER] Dave. I’ve had the panel off and there was a very thin matting of hair across part of the evaporator but nothing too substantial which was surprising considering how much lint there was in the rest of the machine. I noticed that on the floor of the condenser/evaporator area there was a small pool of water – is this normal?
Spoke to the Boss and she’s saying it’s definitely taking longer to dry everything. I’m just wondering whether the pump isn’t pumping out the condensate properly or whether the compressor is on it’s last leg.
[USER=”49782″]kaibart[/USER] Yeah the e90 code is sorted now the relay has been replaced.
Regarding the cleaning product, is this what you mean? https://www.bosch-home.co.uk/store/cleaning-and-care/cleaning-products/for-washing-machines/00312111?tagrid=65429272#/Tabs=section-local/water drips off the evaporator and falls into a sump so it can be pumped away
lack of drying can be either air flow or refigeration
Dave
- You must be logged in to reply to this topic.