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2901   error 5533 dryer thermostat


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Hi...we are getting the 5533 error. The fan on the end of the dryer unit that is over a plastic tunnel seems to be working, but it's not blowing all that hard. there is one fan in the end where the circuit boards are is out. It is facing the back of the machine. (see att.1). There is a "click" when we hit "yes" to cancell the error mssg, then immediately the error mssg starts again. Smells very hot also.

I also found a loose component in the dryer assembly. (att2) It seems like it is an offset rod of some sort. The nut holding it in place was almost off, and this rod was simply spinning in the hole. Is there any particular direction this component should be facing when tight?

We are shut down at this time, so any help would be greatly appreciated.

Thanks,   Brad

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This error normally means the dryer fan is not operating.

Check the dryer fan is free to rotate by hand.

If it is not spinning freely by hand it is likely to be a sized bearing etc.

If it spins freely, there is probably an electrical fault either with the motor itself, or with the supply voltage going to the motor.

The fans in your photo are for general cooling only, they are not used for the actual dryer unit.

See the attached PDF for the location of the dryer fan (marked in red box).

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Dave...The fan turns freely, and in fact looks brand new. Yesterday, the fan was working good. Today when I fired up the machine after checking the fan, we got the same error, and the machine was still cool. I checked the processor status, and it was as follows: CD-26.2   BF-21.3   STB-21.7   Dry-23.7....

We also noticed that when we get the 5533 error, all the chemical status squares on the screen get a red X through them at once.

Could we have a faulty sensor or thermostat? If so, how would we check?

That little rod thing that was loose...any idea on that?

Thanks,

Brad

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You could have a faulty thermo sensor though very unlikely, you can confirm this by checking the dryer temperature with a thermometer, and see if it matches the display temp.

The squares will go red; this indicates the processor is in an error state.

There is an over temp stat that switches off the dryer heater if it detects a temperature over 90oC. It should reset when the temperature goes below 70oC. When this stat operates you get the 5533 error.

The fact you said it smelt hot indicates to me that it did actually overheat.

There are generally 2 causes of this.

1. The dryer fan is not operating. Or is stopping and starting.

2. The SSR’s (Solid State Relay) that control the dryer are faulty and are not switching off the dryer heater when they should.

If it is now showing the 5533 error continually even though the dryer is not over temp the safety thermostat has not reset/ or is faulty.

With the safety thermostat removed from the machine it should measure approx 0 ohms with a resistance meter.

See attached for the position of the safety stat (green box) and thermo sensor (blue box).

The pin is to keep the cover locked when the conveyer is in the down position.

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Hi Dave S......I took the safety stat completely out and checked it...0 resistance. I was hoping that it was shot, but it seems O.K.   It was extremely dusty in there though. Cleaned it all out.

Is there a way to check the fan motor without having to simply replace it? Really can't afford the expense of another big $ part right now.

Thanks,

Brad

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Hi Brad,

The easiest way to test the fan is to remove the top dryer rack, then close the dryer door, pull down the conveyer, then turn on the drive, use the drive on/off in the first menu. When the drive is running lift up the conveyer, and open the dryer door. You should be able to here and feel the fan working, it should be pretty powerful.

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All Noritsu kit have an input and out checks in the menu

Any motor relay or sensor can be checked using the keyboard

Very useful for faults like this, with a voltmeter, put a meter on the plug supplying the heater, fan, pump etc. and turn it on by pressing the yes key.

Find something that works and try it to see how it works.

If you can find the relay or SSR that turns the devise on, Noritsu normally have a RED LED, that should also go on and off when you turn the devise on with the keyboard

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