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Repairing Bezzera Bz99S ...HELP!!!
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ricardo_dacosta
Senior Member


Joined: 30 Jul 2013
Posts: 41
Location: Montclair
Expertise: I like coffee

Posted Tue Nov 12, 2013, 9:29pm
Subject: Re: Repairing Bezzera Bz99S ...HELP!!!
 

Update:

Got a replacement Giemme box from jpboyt and the machine did started. However no water went to the boiler and after pressing the brew button, machine turned off again.

I replaced the heating element today along with the thermal switch hoping this was going to solve all my problems. Unfortunately Im still where I started. Green lights goes on and few seconds later the relay clicks and machines turns off.

I have followed the wire schematics to make sure everything else where its supposed to and the schematics didnt quite look like the inside of the machine so I follow through and wire everything as the schematics looks and still nothing.

Feeling a bit frustrated now. Worked on it for 6 hours non stop today. Really would like to see it working.

The boiler and pipes are nice & clean so is the group head. Have replaced the gasket. New heating element. New thermal switch. Fixed controller box.

What could it be?
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ricardo_dacosta
Senior Member


Joined: 30 Jul 2013
Posts: 41
Location: Montclair
Expertise: I like coffee

Posted Fri Nov 15, 2013, 5:01am
Subject: Re: Repairing Bezzera Bz99S ...Working!!! :)
 

Apparently I had the wiring to the pump wrong and this caused a trace within the controller to burn. I figured this by opening the controller and checking for continuity on each terminal and found the pump terminal had no continuity.

I took the controller to a local shop that fixes speakers and amps and asked them if they could repair the broken trace within the circuit board. In 20min I had a working controller again and for only $20 :)

Went home and really took my time to wire each and every cable properly and finally got the machine started.

There was a lot of steam coming out of the safety valve so I took it apart and cleaned a bunch of build up. Put it back and no more hissing :)

Machines cycles, steam comes out of steam wand, hot water comes out of water wand and brew group.

The flow rate at the brew group without a PF is very low, like 1oz in 30 seconds. I suspect I have to adjust the white screw from the OPV bypass? If so how tight or loose should it be? Is there anything else that influences the flow rate?

Getting close!
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