[bobmedia]

Re: Matsui MF2W/A dishwasher stuck cycle

A progress report

Heating element — misleading reading and action taken

When I originally checked the heating element I used a Megger which showed the element to be fine ie a short circuit.

This time I also checked the resistance which returned a reading of over 1300 ohm. Far too high.

I then checked the resistance to earth — It was a short circuit. After all the searching the problem was a duff heater after all.

I fitted a new heater — resistance 31 ohm.

Preparing the pressure switches for service

In the absence of a forum response to my question about the need to re-pressurise the pressure switches.

I decided to play safe. I emptied the sump and the adjacent pressure switch partition chamber of water using a ladle, sponge, and finally the length of the clear plastic pipe I used to test the pressure switches.

I could see the water rise as I sucked on the plastic pipe and using this approach managed to empty pressure switch partition of completely of water.

Pressure switches charged properly and dishwasher goes through cycle correctly

I then put the machine through ‘pre-rinse cycle’ to recharge the the sump and the adjacent pressure switch partition chamber.

It went through its cycle just fine.

Next I put the machine through a light wash cycle and the machine performed just fine.

Your Matsui MF2W/A dishwasher stuck in cycle?

When your Matsui MF2W/A timer stops earlier in its cycle, turn off the water and unplug the machine.

Pull it out and put it on its back. Remove the base panel. Remove the anti-flooding interlock. Unplug the two cables feeding the heater element and check its resistance. Should be 30 ohm or thereabouts. If not the heaters defective and you should replace it.

Pull the cables off each of the two thermostats and check resistance. It should be in the order of .5 ohm or less. If the reading is high then replace.

As you haven’t interferred with the pressure switches there is no need to recommission these as described above.

Remount the anti-flooding interlock and refit the base pan.

And that’s about it. Job done.

I haven’t had such fun since working to keep my Hillman Avenger going all those years ago. 120,000 miles on the clock before the iron termites did for it. LOL

Vote of thanks

Once again I thank all forum members for their help and support in solving this problem.

I’ve learned a great deal about the machine and how to access the various components.

Case file closed.

[bobmedia]

Re: Matsui MF2W/A dishwasher stuck cycle

madangler1 wrote:… check those pressure switches … older timer based units the heater power goes through the pressure switch to prevent meltdown when no water in.

I removed the right hand panel.

The pressure switches and hoses are simple access from this position and they unclip easily.

I unclipped the clear plastic tube and connected another one which I then gently blew into to operate the switch action. Checked out ok.

One thing I noticed when I disconnected the plastic tube there was a noticeable rush of air from it.

I reconnected the hoses.

Presumably I need now to empty the sump of water completely of water and then refill so that the pressure switches are pressurised as before.

Is that correct?

What happens if I don’t?

Once again thank you to the forum for its ongonign help and support.

[bobmedia]

Re: Matsui MF2W/A dishwasher stuck cycle

repman wrote:think you may have to lay the m/c on its back and remove base to see

Repman thanks for this suggestion which I’ve followed up on. Putting the machine on its back was much easier than I thought.

As was removing the base pan and discovering the anti-flood cut-out.

Much easier to test the heating element, and the two thermostats from this position.

However didn’t make testing the pressure switches easier. You could acces the terminals well enough but not the pressure switch hoses.

I put the pan back on, put the dishwasher in the upright position, and then remove the RHS panel.

[bobmedia]

Re: Matsui MF2W/A dishwasher stuck cycle

Removed and checked thermostat for continuity.
Effectively a short circuit (around 0.5 Ohm). Same sort of reading as the one on the RHS I checked earlier in the week.

Forum posts suggest other items to check are:

pressure switches — which means I’ll need to remove the RHS panel once more to check.

heater control relay — now need to hunt this down

[bobmedia]

Re: Matsui MF2W/A dishwasher stuck cycle

madangler1 wrote:… check those pressure switches … older timer based units the heater power goes through the pressure switch to prevent meltdown when no water in.

I’ll find out where the pressure switches are and check these.

Thx for the suggestion Madangler1

[bobmedia]

Re: Matsui MF2W/A dishwasher stuck cycle

repman wrote:think you may have to lay the m/c on its back and remove base to see

Thx Repman for that suggestion. I’ll do the RHS panel first and see how it goes.

[bobmedia]

Re: Matsui MF2W/A dishwasher stuck cycle

Repman and madangler1

Thank you for your input and suggestions.

I’ll take the left hand panel (so far I’ve just taken the RHS panel off) and have a further look.

Together we’ll chase this solution down.

Again thank you for your help.

[bobmedia]

Re: Matsui MF2W/A dishwasher stuck cycle

Kwatt,

Thanks for your reply and it does explain my difficulty in finding the information.

I’ve also been to my local Curry’s repair centre. I asked if they could give me a copy of the circuit diagram. Understandably the answer was a polite “no”.

Thinking laterally I wonder if this machine is marketed under a different brand name and hopefully information on that item may be forthcoming.

I’m perplexed that if there isn’t any technical information available how can I call someone out to repair the machine who isn’t associated with Curry’s. Presumably they won’t be able to do so.

Be that as it I’m determined to repair this machine myself (with the help and guidance of forum members — for I’ll be eternally grateful).

Again Kwatt thank you for your contribution.

[bobmedia]

Re: Matsui MF2W/A dishwasher stuck cycle

I’ve searched far and wide on the internet for a circuit diagram for this MF2W/A without luck. In desperation I’ve changed the timer but it hasn’t correct the problem.

So controller, heating element, and thermostat are ok. So there must be another interlock/sensor that turns the heating circuit on.

But where? what? how? is the sensor.

Any hints or clues about how I can fix my dishwasher?

Thanking you all in anticpation.

[Author]

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