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Hello everyone,
I am a little perplexed with this one! My machine is a little over one year old. The thermal cut outs on the heater box trip out every now and then. Reset them and off it goes again.
Using a test screwdriver, you can see that power is supplied to both heater elements. The upper one seems to switch on and off but the lower one seems to be constantly powered during the drying phase.
My logic, in the absence of any wiring diagrams is this:
Supply power to the elements and spin the fan and you get dry, hot air! When the temperature reaches a maximum, set by the thermistor, it should cut power to one or both of the heater elements, to prevent overheating.
The power supplied to the elements is too great to be switched by the thermistor, so there must be two relays or power transistors on the control board to do the switching.
If the thermistor is working, and the relays, then the elements will cycle through power on and off. Well one does, the other element doesn’t. That might be a design feature or a glitch!
The max operating temp is being sensed by the thermistor, so at least one element switches on and off. I really think that both should cycle on and off. Any thoughts??
I get the feeling that the switching control on the PCB is not functioning correctly?
Any thoughts gratefully received. Good luck to everyone through the difficult times we are in.
Hi Dave, many thanks for your response.
It’s a Hoover Washer Dryer
WDWOA596AHC-S
3100 7465 1750 6144am lost now you are talking about 2 elements. one is the wash heater only used in the wash cycle and the other is the dryer element only used on the drying cycle
yes each one has a seperate relay on the boardyou are talking about the dryer element and the fact it trips out
more often than not its an air flow problem. Blocked ducts or fan problem either not turning properly ot bunged up with fluff
what have you checked ?
Dave
Thanks Dave, sorry for any confusion.
This is just the heater element in the drier section that I am referring to.
I have focused on diagnostics. Checked power to the thermal cut outs and power out to the heater(s) once the cut out has been reset. Cycling of power to the heater, so verifying the thermostat.
I will have to open the casing to check for fluff and also check the condenser pipe for blockages.
There is the expected cycling of cooling water for the condenser plate but I’m not sure if that also cleans away any fluff and debris
I hope that helps
All the best
Marc
Apologies for any lack in my knowledge. It’s not my full time trade
cooling water is only a trickle. its just a bit more than a dribbling tap. it only needs to create a cold surface for condensation to form
Dave
If the thermostats on the dryer need resetting alot it means the condenser is blocked to clear this mains plug out top off and remove heater box I think there is 4 maybe 6 10mm bolt holding it in place the heater box also attaches to the door seal with a metal band pull up towards back of machine once you remove that all will be come evident you will see a build up of fluff clean as much as u can and test kai
Many thanks for your help. It’s the next thing on the list to try. I’ll report once I have the box split. I suspect if that’s thats the case, there will be fluff in the pipes leading to the box.
Thanks again
Marc
Also, turn the water off under the sink, remove the hose from back of machine, position hose into condenser pipe and inject a few squirts of water down pipe to clear any blockages in there. Clean fluff from fan blade too.
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