Mcz Musa hydro stuck on a02 error.

[David Redfern]

Hi

I have a MCZ Musa hydo 22 which has now gone wrong for the 4 th time in 2 years. it is now stuck with the error A02. No pellets. I refilled the pellet hopper but after pressing the button for a Number of minutes the same error is still showing.

I have looked on the internet but am unable to find where the reset button is on the mother board. So that I can see if that will get it going again.

 

[wwert]

Try unplugging for a couple minutes

 

[David Redfern]

Try unplugging for a couple minutes

I have tried that and it does not change anything. When I go to the technical menu it says on "screw feed stop" instead of " screw feed loading". I am unable to reset the feed by pressing the on button for a few minutes.

 

[David Redfern]

I Have found this in service manual but it does not tell you where the sensor is

Appearance of the PELLET alarm with the hopper full.
This problem is closely correlated to the electromagnetic interference at the electrical wiring level that causes the incorrect signalling of the sensor. It is instantly obvious that this type of alarm is false, since the device is blocked immediately without waiting for the appropriate 20 minutes of pre-alarm that warn the user of the effective lack of fuel.
Solutions:
 Adjust the sensor by using the screw placed at the rear of the same sensor. By turning the screw, a small green LED placed next to it will turn on or off, depending on whether the sensor detects the pellet in the hopper or not (ON = presence of pellets / OFF = hopper empty)
 Divide the “high voltage” cables from the “low voltage” ones (especially the sensor cable)
 Given the difficulty in carrying out the calibration or in avoiding the problems linked to interference, MCZ advises completely eliminating the sensor. Deactivate the sensor via software and disconnect its wiring.

 

[SwineFlue]

I Have found this in service manual but it does not tell you where the sensor is

Appearance of the PELLET alarm with the hopper full.
This problem is closely correlated to the electromagnetic interference at the electrical wiring level that causes the incorrect signalling of the sensor. It is instantly obvious that this type of alarm is false, since the device is blocked immediately without waiting for the appropriate 20 minutes of pre-alarm that warn the user of the effective lack of fuel.
Solutions:
 Adjust the sensor by using the screw placed at the rear of the same sensor. By turning the screw, a small green LED placed next to it will turn on or off, depending on whether the sensor detects the pellet in the hopper or not (ON = presence of pellets / OFF = hopper empty)
 Divide the “high voltage” cables from the “low voltage” ones (especially the sensor cable)
 Given the difficulty in carrying out the calibration or in avoiding the problems linked to interference, MCZ advises completely eliminating the sensor. Deactivate the sensor via software and disconnect its wiring.

Does the manual tell you how to "Deactivate the sensor via software"?

 

[David Redfern]

No the manual does not. It is the worse manual that I have ever seen. I have left the oven off over night to see if that helps.

 

[David Redfern]

I have found the problem the cable that goes from the switch box had wangle contact on the motherboard. Oven working.

 

[SwineFlue]

I have found the problem the cable that goes from the switch box had wangle contact on the motherboard. Oven working.

Very glad to hear that it is working again!