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Hello, I wonder if anyone has come across this problem because I am now on my second dishwasher with the same fault.
I had a Hotpoint FDUD51110p, which after 18 months came up with F10 fault indicating the heater. as it was out of guarantee I took out the heater and the element was fine but one of the two thermal fuses was open circuit. This thermal cutout was coloured in with marker pen, presumably at the factory and did not have a spring for some reason like the one with out the marking. I managed to bend the contact back together and operation was restored. at the time I contacted Hotpoint, who could not care less as i thought the missing spring was essential to the correct operation of the cutout. they offered to send out an engineer at the cost of £60…
Fast forward 2 years and our new kitchen has an integrated dishwasher made by AEG. With just over 4 months of use and without any error codes on this machine the plates were not clean and it was not heating water. The repair man came out today and opened it up and low and behold the same Bleckmann unit is in this dishwasher. One thermal trip is marked with red marker pen and doesn’t spring back. The pump/heater was exchanged and I have the old one.
Re: Bleckmann heater/pump units
Most heaters are doubly controlled by these safety cut-outs, one is normally a resetting type which will control heater by going on & off, the second is a higher rating non resetting type which when open circuit cuts out heater completely. They are safety devices to prevent heater working when there’s no water for instance.
From field experience i’ve seen, the heaters are going open circuit via temp’ cut-outs rather than element windings being open circuit, I believe most of the problems with heater failure to be due to dirty filters & overdosing of detergent.
Overdosing of detergent is a problem as suds reduce amount of water going through heater, likewise dirty filters will reduce flow through heater.
Filters i’ve seen are mostly gunged up by undissolved plastic wrap off tablets due to low temperature & or short cycles being used.
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