The heat is on…

Dimplex DX300T heater gets repaired in the workshop.

I acquired this Dimplex heater as the previous owner had reported that it had tripped their electrics and smelled of burning, it was perfect material for the workshop.  The owner had given up on it and I felt like I could give it a second chance.  This is the usual way we end up with much of the stuff in our home.

Now, this heater is only a few years old and on the face of it, it looked in reasonable condition, with just a couple of scratches, so it would be a shame if I couldn’t get it working.

With electrical faults like this, I always check the basics; the condition of the flex and mains plug etc.  I then measure for resistance to earth from either live or neutral to see if there has been any electrical shorts, that would have triggered the reported fuse incident.  All clear.

Through the top heat vent, I had a quick look at the inside of the heater to see if any stray paperclips or other metallic item had found its way to the heating element or wiring creating an electrical problem, again, all clear.

Upon checking the mains plug again, something didn’t seem quite right.  It felt a little ‘warped’.  I’d already checked the fuse for continuity via the live and neutral (there was resistance), but it was time to take it out to have a proper look.  The plug on this heater was a ‘moulded-on’ type, with no screws and the fuse carrier was accessible from the outside, should it need replacing.  Upon levering the fuse holder out, the plastic carrier sheared off, revealing burned plastic and signs of melting.  The plug was toast.

I decided to break the plug cover off and see what was going on.  The plug had ‘run hot’ for some time causing the casing to melt and smoulder and the excess heat had probably caused excess resistance, exacerbating the problem, making the previous owners’ electrics to go pop.

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With the cover ‘broken off’ the plug, I was then able to cut back the internal connections and remove the cable from the mouldings, without sacrificing the cable length, which was a good job as the flex was quite short anyway.

I always keep a few replacement ‘quality’ mains plugs in the workshop for occasions like this, as not all moulded plugs are terribly well made and the melted one I had here was a good example of what can happen when the quality of the plug can’t match the potential current flow required.  The heater is rated at 3K Watts (max), which would mean a current of 12.5 Amps, which is close to the 13 Amps fuse fitted.  Poor quality materials and connectors would generate excess resistance and therefore heat.  The resistance was probably detected by the sophisticated minature circuit breaker in the previous owners’ electrics board, which was a good job as who knows what could have happend if the plug had been next to something flamable.

With a new plug fitted, the old fuse re-fitted, the heater sprung to life and didn’t seem to draw excess current when checked.  A nice cheap fix and I didn’t even have to take the heater apart.

Cost of a replacement heater:  £50 (circa)  Cost of repair:  One cup of tea.

Morphy Richards smoky heater

A heater with a broken motor gets a clean up…

I like the classic, function-over-form design of this heater.  Simple, clear, chunky controls and nothing included that isn’t needed.  Less is usually more.

This 1980s heater, although very well made and clearly designed with longevity and repair in mind was a little bit, er smoky.

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Fixitworkshop, February’19, Morphy Richards fan heater.

It appeared that the fan wasn’t running and the smoke was coming from old dust which had settled inside the machine.  I don’t think that the heater had been used in many years.

The heater came apart very easily, just three self-tapping screws holding the sides together to the main shell.

On first examination that the shell was out of shape and that it had come in to contact with the fan itself, forcing it to far down the motor shaft on to the motor body.  So, all that would be needed would be reposition the fan and re-shape the outer heater shell, a simple fix then.  Not quite.

The motor did not spin easily and even with a little penetrating oil on it, it was turning slowly, with the mains applied.

The motor was an induction type, with no brushes and didn’t obviously have anything restricting the motor’s spin.  I know that even apparently clean motor parts can have deposits of unseen oil and muck that can stop an otherwise good motor from working properly.  In situations like this, I tend to use brake cleaner or similar to break down the dirt.  Once cleaned, just a couple of drops of sewing machine oil on the moving parts and that usually cures things.  I was in luck and after performing a mild service on the motor, it was spinning at full speed once again.  Quite literally warming.

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With the parts all back together, the heater was ready to run for many years to come.

Cost of replacement:  £15.00    Cost of repair:  £0.00, one cup of tea and a Bourbon.

Another smoking Kenwood Chef A901E sorted in time for Christmas…just

Another Kenwood Chef gets the treatment in the Workshop

How about another Kenwood Chef story?  I know I’ve covered this machine a few times now, but I’ll try and make it as interesting as I can.  I just LOVE Kenwood Chefs.

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FixItWorkshop, December’18, Worthing, Kenwood Chef A901E on the bench.

A customer got in touch with me via the FixItWorkshop ‘contact us’ link asking if I could fix his family’s much beloved Chef.  While last in-use, it started smoking and smelling terminal.  How could I refuse.  I’m located in Worthing, but the customer was based in North London, quite a distance for a repair and would have been usually cost prohibitive using the Royal Mail.  However, using local drop-off points, carriers such as Hermes and DPD offer (slightly slower) courier services for about £7.00 one way, which starts to make more fiscal sense.  This is what we did.

I wish I’d taken a photo of the box the Chef came in, because the customer had clearly gone to a lot of effort to make sure it was well protected!

On with the repair.

The Chef has been in production many years and although they can often appear similar on the outside, they do vary on the inside, depending on the year of manufacture as small tweaks and improvements are made.  Evolution, rather than revolution, usually the backbone of any successful design.

The A901E is different from the previous A901 as it features an electronic speed controller, rather than a centrifugal affair.  While the later design is an improvement, it wouldn’t deter me from buying an earlier model; the improvement is small.

The A901E still features similar components to previous models which can and do fail, especially with age.  The subject here is about 30 years old, give or take.

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FixItWorkshop, December’18, Worthing, A901E, motor removed.

The motor on the A901E comes out quite easily; first remove the motor cover, remove the mains cable (disconnect first of course), remove the top cover, belt, then the four screws holding the motor in.  The motor then pulls down from inside, out through the gap left by the hinge.  Easy.

The motor circuit board showed traces of component catastrophe with dust and dirt left by exploding components.  Nasty.  Pre-empting the fault, I ordered a repair kit before I’d taken the machine apart, together with replacement feet as the ones on this machine were knackered.  The kit includes capacitors, resistor and triac as these are the main components that tend to fail.

These kits are available on eBay and are worth the money as they are often cheaper than buying the components separately and they contain instructions for newbies.  Here’s a little slide show showing the process.

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With the kit fitted, the motor re-installed, mains reconnected, the Chef ran well again, this time without burning or smoking.  However, all was not well as the speed control was a bit wobbly at lower speeds, which was just plain wrong.  Having worked on a good few Chefs, this problem is usually down to excess end-float on the motor spindle.  Working with the motor still in situ, the motor fan, which controls end-float could be adjusted with an Allen key.  Sorted.

Just the replacement feet to fit and after a quick clean-up, the Chef was reassembled, ready to go home.

A top tip for you.  If you intend to replace the feet on your machine and you probably should if they are old as they go hard or fall apart, then soak the area around the feet recesses with WD-40 or similar a day or so before as this will make getting the remnants of the old feet out, much easier.

Cost of a replacement:  £400 up.  Cost of repair:  £12.65 plus my time and tea.

Silent Singer Sewing Machine Pedal

A classic Singer foot pedal gets repaired.

My mum’s got an old electric Singer sewing machine which is about 40 odd years old.  Singer sewing machines are well supported generally and parts are readily available, but I find it’s sometimes fun to try and find the cheapest way to fix something myself.

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FixItWorkshop, Worthing, November’18, Singer Sewing Machine Foot Control Pedal

The foot pedal on this machine went pop and smelled horrible after.  The machine then stopped working, oh dear.

The pedal is of high quality construction and easily better than any generic replacement on the market, so it was definately worth saving.

Opening up the pedal was just a few screws, which then exposed the whole mechanism.  The mains resistor was in tact and seemed to test with resistance.  A good start.  The contacts were in good condition as was the rest of all the components, except for the mains input capacitor, which has spectactularly failed and split open, a common problem on older mains capacitors.

Repair kits are readily available for about £5, but that seemed expensive to me!  Using the existing capacitor as a guide, I found a suitable component on eBay for £2.09 delivered.  That’s more like it.

The capacitor I used was:  Film Capacitor, 0.1 µF, 250 V, PET (Polyester), ± 5%, R60 Series (from eBay).

Here’s a little slide show that I hope will help others fix their pedal, should it fail.

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With the old capacitor cut out and the new one soldered in, the pedal was ready to run again.  Sorted.

Cost of a replacement:  £15-30 for a generic part.  Cost of repair, £2.09, 1 cup of tea.

Another Smoking Kenwood Chef Excel A902/ A904

I’ve repaired a few Kenwood Chefs recently, but this one seemed worthy of a mention on these pages as it’s slightly different to the ones I’ve repaired so far.

Many Kenwood Chef accessories are usable on Chefs from all eras, due to logical thinking by the designers over the years and this is something to be applauded as it reduces waste.  For example, the beater on a 1970s machine will fit one from today.  An interesting fact for any occasion.

I’ve repaired many A701s and A901s, but this was the first A902/4, so I thought I’d share some of my repair experience in order to help others.

The owner contacted me explaining that she’d been using the family’s cherished Chef to make a cake when a plume of smoke started coming from the mixer.  The smell was bad and she’d quickly disconnected the unit from the mains.  The owner then contacted me to ask ‘was the Chef worth repairing’?  Of course it was!

I suspected the infamous speed control components which tends to fail with age.  However, this model featured extra components all mounted on a neat printed circuit board (PCB) which is fixed near the motor.  A reasonably priced repair kit, with new rubber feet was available online so I ordered one up straightaway.

Opening up the A902/4 is a similar job on many Chefs and after removing a few screws, the motor and gubbins is available for maintenance.

As suspected, two out of the three capacitors on the PCB had blown visibly, due to crystallisation and general fatigue, so these needed to be replaced.

PCB
FixItWorkshop, May’18, Kenwood Chef Excel A902/A904, PCB before work.
PCB renewed
FixItWorkshop, May’18, Kenwood Chef Excel A902/A904, old and new components.

As all the components are PCB mounted, each part must be de-soldered first, contacts cleaned before re-assembly which is time consuming, but satisfying and even though I’ve done this kind of work many times before, I always take a couple of photos and mark wires with a pen or label, as it’s very easy to make mistakes later.

The kit included replacements for the faulty bits, plus some additional parts which should be changed as a matter of course.  I also chose a kit with replacement rubber feet for the machine as the ones fitted had squashed ‘flat’ with age, a very common problem with the Chefs of this vintage.

New components fitted, the motor ran sweetly once again, without smoke, wobble or extra noise.  It’s worth noting that the A902/4 is quieter than earlier Chef models and is probably worth seeking out if you’re in the market for a second-hand unit.

Another ‘happy little Chef’ leaves the workshop.

 

Cost of new machine: £400 plus.  Cost of new parts:  £15.24 plus my time.

G.E.T. Dehumidifier with damp issues…

GET dehumidifier with damp issues…

Over a cuppa, my mother in law mentioned that she was chucking out a dehumidifer this weekend and had already replaced it.  This was a shock to me since it hadn’t started it’s journey to Worthing tip via my shed yet.  Time to intervene.

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FixItWorkshop, Jan’18, GET Dehumidifier repair.

Aparently it had overflowed water all over the floor and had cut out and not restarted.  It had probably been left to its own devices in their cellar, totally neglected in the run up to its demise.

Before worrying my toolbox, I usually plug things in and press buttons to see what happens.  When connecting this dehumidifier to the mains, it fired-up and seemed to run perfectly.  Strange.

Looking at the device in more detail revealed three tell-tale LED lights (cooling, empty the tank and running).  The tank was removable from the front and featured a small float operated level which married up to a small microswitch.  The idea being that when the water rose to the top, the switch would be activated by the float and the machine would cut out safely, all being well.

The lever mechanism on the float seemed to be stiff and all that was required to restore service was a good clean with a brush and Fairy liquid and some silicone spray, once dried.

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FixItWorkshop, Jan’18, GET Dehumidifier repair, microswitch.

While giving the unit a general inspection, I noticed dirt in the units’ grille.  Fortunately, the grille had a removable filter which had clearly never been cleaned, so in effect had been chocking the dehumidifer in normal operation.  Bad news.

Piecing the evidence together in my mind surrounding the causes of failure, I came up with the following theory.  The float had failed, causing the unit to leak.  The unit had then run hot, probably for a while and had probably tripped a thermal protection fuse.  I have no evidence for the latter idea as I never opened up the unit fully, but the theory fits the sequence of events.

In any case, the dehimidifier now switches on and switches off when full and doesn’t seem to run hot.  I was pleased with that.  I wasn’t so pleased that my in-laws wanted the unit back.

Cost of replacement: Circa £100.  Cost of repair; cleaning stuff.

 

Kenwood Chef A901 -a fishy story!

If your Kenwood Chef A901 starts to smell of burning, don’t despair, it can usually be saved.

I had an enquiry via this site from a fisherman who was very upset that his trusty Kenwood Chef A901 had given up the ghost.  Rather than using the Chef to make Victoria sponges, it had been used to prepare fishing bait.  It just demonstrates how versatile these machines are.

Kenwood Chef A901
FixItWorkshop, Oct’17, Kenwood Chef A901 with motor speed control fault.

Whilst it was in use, the owner witnessed a bang then the smell of burning before the machine came to a halt.  The plug was quickly pulled!

Whilst discussing the fault on the phone, I suspected that the fault was probably due to the failure of the motor speed control circuitry, which is known to fail with age.  I had carried out similar repairs to other machines, including my own (in this blog) so agreed to take a look.

I received the machine quickly and upon inspection, the machine had obviously been cared for and considering its age, was in good condition.  The smell of burned-out components was clear, lifting it out of the box.

Dismantling the machine and removing the motor on the A901 is fairly straightforward, providing you allow time and make notes on where things go.  The components that need to be replaced are very accessible and anyone with moderate soldering skills would be OK with this task.

Luckily, the Chef is very well supported by long-term aftermarket suppliers and I bought an off-the-shelf spares kit at £14.10 delivered, from KAParts (www.kaparts.co.uk) via eBay, featuring upgraded components.  This kit is a little dearer, but component technology has moved on since this machine was first on the market, so fitting anything else is a false economy in my opinion.

With the old components removed and replacements fitted, the motor ran smoothly and fully reassembled, the machine is now ready to mix bait mixtures once again.  Lovely.

Cost of a new machine: Circa £300 and up.  Cost of repair:  £44.10 (kit plus my time).

Here’s a little video I made of the repair.

Enjoy.