Teka not heating

[gtv]

Hi there, I have a Teka ALS13 1300E washer/dryer and it has started not to heat during the wash cycle. It all running though the program with no trouble but no matter if you do a 30 or 90 wash the water doesn’t heat up.
The element is reading 27 ohm so I believe that is ok, I have traced the supply back to the control pcb and there is supply on the primary of the relay but the replay is not switching.
Can anybody give me any idea’s and where I can get spares from for this.
Many thanks. :rolls:

[gtv]

Re: Teka not heating

bump, can anybody help?

[gtv]

Re: Teka ALS13 not heating

I am still in need of help with this, I have now replaced core pcb, the cutouts on top of the machine and swaped the thermostat above the element. I have also rigged up the element to a mains supply and it heated up so that seems ok. I have now run out of ideas, am I missing anything? and is anybody reading this?
Many thanks for any help you can give.

[admin]

Re: Teka not heating

Hi

I take it that you have also checked the pressure switch contacts,not just the water height one.

Bryan

[gtv]

Re: Teka not heating

thanks for your fast reply, to answer you no, where would I find them?
cheers

it goes thought the wash cycle with no problems (about from no heat!), and the dryer side of it is working fine by the way.

[gtv]

Re: Teka not heating

Ok I have now checked the pressure switch and all seems well there, not blocked and contacts fine, this is a real puzle for me ❓

[Washman]

Re: Teka not heating

Hi

Have you checked the correct heater ,from you description it looks as if you are checking the dryer element in the top of machine . Wash heater is at the back of machine just near the motor.

Washman

[gtv]

Re: Teka not heating

yes I am checking the element at the bottom of the drum, I am a brown good engineer but this is the first time I have played with a washer/ dryer!

[gtv]

bump

[Penguin45]

Re: Teka not heating

Do you understand how the machine works? I haven’t a clue about the video (or is it now a cd) machine?…..

To operate the heater, the following things must occur in the correct sequence.

1/ Door locks.
2/ Fill, tumble and probably top-up on a modern machine. Pressure switch must be in the “full” position before the pcb will decide to activate the heater.
3/ The heater must be functional. It should show a resistance of 20 – 30 ohms (when split from the circuit), depending on the power rating. It should also show no earth reading when meggered.
4/ Temperature control is achieved by a thermistor or “ntc” device connected to the pcb. NTC is “Negative Thermal Co-efficient” – the hotter the water, the lower the resistance. It normally reads in kOhms. This is sent through a comapartor array on the pcb to decide the temperature.

Obvious course of action is resistance tests of heater and ntc, continuity through the pressure switch, then continuity from the pcb to the individual components.

This should be enough information for you to decide what is wrong with your appliance.

Teka machines are usually a Candy in a dress – we don’t have full tech info on them, so specific answers are difficult. Your call, really.

Penguin45,
Moderator.

[gtv]

Re: Teka not heating

put it this way I am learning fast 🙂
ok machine fills and as you say then tops up
goes though a pre wash
after about 10 mins I can hear a relay on the core pcb switch on, and there is then supply to the heater element but after .5 sec relay turns off.

element is reading 27ohm and is working ok, have hooked it up to a supply and heats up.
NTC is reading aprrox 6kohm when heated and when cooled goes to approx 80kohm

I have checked the pressure switch and pipe for blockages which there was nope and switch working on both sets of contacts fine

Condenser pipe was almost blocked but have taken off and cleaned out

Core pcb has been changed

I am now stuck, I can’t think of anything else to check, but as said I am a brown goods enegineer not white that is why I have come here to get expert help 🙂

I have I missed anything out? any ideas on where I can go now? as you have said I also beleave this to be a Candy machine but unsure of which model.

[cockney steve]

Re: Teka not heating

A long shot (from an amateur as well :rolls: ) possibility your NTC is out of spec.

RSWWW.com stocks all sorts of “bare” ones and you will be able to get the PDF’s for the tech. spec. with appropriate TEMP /RESISTANCE graph.

Alternatively, as the relay pulls in OK, but drops out after a very brief period-is there a dry joint/high resistance connection which goes O/C with the current?

If the relay drops out, I’d look at the “control” side, -if it stays in but the heater doesn’t work….the heater side is suspect

[gtv]

Re: Teka not heating

cheers for that,
I have compared the NTC with the dryer one and they read both about the same, as said before relay cuts in and them out again but the main pcb has been changed (in fact twice now!) I am now stuck there is nothing left is there?

[cockney steve]

Re: Teka not heating

IMHO, you’ve just answered your own problem

I have compared the NTC with the dryer one and they read both about the same,

one needs to sense the water temp. typically 90* or less
the other needs to sense heated air temp,which I would expect to be hot enough to evaporate moisture rapidly…guessing 120* upwards.

perhaps you could load the board with a sufficiently high fixed resistor in place of the NTC,to simulate cold water.

As you’ve replaced the board, it’s logically the NTC or it’s wiring,as it is these that operate the relay(wild assumption that the heater IS controlled by a relay!)

[gtv]

Re: Teka not heating

but shorely they sould both read about the same at the same temp?

[Author]

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