Boch Wash+Dry Exxcel 7/4 dryer fan not working
Hi
I have a 3 year old Bosch wash+dry Exxcel 7/4 (model nr WVH28360GB) which stopped drying around Christmas 2017. Having bought the machine from Wash-House 3 years ago I have all labour included for any repairs abd so called out an engineer.
He pulled out a large handful of lint from the fan but could not get the fan to stay running during a drying cycle - it would work for say 5 mins and then stop - thus the heating element cuts outs would pop.
A month ago the machine then stopped heating the water, after being informed repair costs for parts would be in the region of £300 (I stopped coughing 10 minutes later) I said thankyou and showed him the door.
So - having a reasonable (but limited) understanding of electronics I decided I would have a look. I tested the water heating element which seemd ok, stripped out the main pcb and cleaned everything and have managed to get the machine to heat water again, but not get the fan to work. There is continuity across the coil so I think it could be cut out or relay related (assuming that the large 4 or 5 square boxed on the main PCB are indeed relays).
Noting that there are at least 4 or 5 cut outs and at least the same number of sensors in the machine - anyone else had this problem and managed to fix it?
Kr
Andy
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.
Bosch WVH28360GB washer dryer not drying due to fan cutting out
- The problem
- Bosch Wash+Dry Exxcel 7/4, model WVH28360GB, stopped drying. An engineer found a large amount of lint in the fan area, but the dryer fan would only run for about five minutes before stopping, which then caused the heater cut-outs to trip. The machine also later stopped heating water, although the owner reported that cleaning the main PCB restored water heating.
- Likely cause
- Confirmed fault was the dryer fan assembly/motor, as replacing the fan restored normal operation. Supporting discussion also suggested the original fan may have been overheating due to restriction or an internal motor fault. Damp, corroded aluminium ducting with deposits was noted and may have contributed to lint and airflow-related problems, but this was not confirmed as the direct cause.
- What fixed it
- The owner replaced the dryer fan with a new replacement fan, after which the machine was reported as fully functioning. A proposal to add filter material to the drum air holes was discouraged because it would likely reduce airflow and trap debris.
- Checks to try
- Engineer removed a large handful of lint from the fan
- Fan would run for around five minutes during a drying cycle and then stop
- Heater cut-outs were tripping when the fan stopped
- Owner tested the water heating element and reported it seemed OK
- Owner cleaned the main PCB and reported water heating returned
- Owner observed the aluminium duct was damp and full of corrosion/deposits
- Parts or tools mentioned
- Replacement fan
Safety: Do not add anything that restricts the dryer airflow path. Further diagnosis should be carried out by a suitably qualified appliance engineer.
3 Answers
A dryer fan motor cutting out could be caused by a faulty connection (although it should be quite random), or it's overheating due to some restriction. If there was a blockage inside the fan housing or where the fan is trying to blow the air is blocked it could overheat. Or maybe just a fault on the motor. Any TOC cutout should be embedded in the windings of the motor and is rarely replaceable separately.
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Hi again,
Fast forward to today and after ordering a replacement fan off Spares2Repair I now have a fully functioning machine.
However
I did note that the aluminum duct was full of corrosion and what looked like washing powder deposits (may have been corrosion) and the duct was very damp!!
So I am thinking about inserting some coarse gauge filter material into the two holes from the drum to 1. stop lint from knacking the fan again and 2. to try and keep the duct dry.
Anyone else tried this or had a better idea?
Andy
Tbh I can’t see that working. The corrosion and deposits of limescale or detergent are most likely caused by steam from the wash rising up through the vent in the top of the door seal and condensing.
That can’t be stopped. You need good airflow between the fan and the laundry inside the drum and anything that reduces that would be bad. Anything that didn’t reduce airflow would be ineffective for your purpose.
Anything like that added would also just trap stuff and cause a blockage unless I’ve misunderstood what you mean. Ultimately I believe washer dryers have a design flaw or weakness that is inherent and they all suffer from it. That is, the chamber you mention gets coated in limescale, detergent and lint, that eventually causes breakdowns and blockages.
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