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FIXED GE Monogram Refrigerator ZISS480DMCS evap fan speed

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Azmcarroll

Premium Member
Joined
Mar 22, 2022
Messages
11
Location
Phoenix
Model Number
ZISS480DMCS
Brand
GE
Age
More than 10 years
Hi been working through issues on our 2004 GE Monogram, recently had a compressor installed as well as the defrost pan, this is the fixed compressor speed unit with 2 speed evap fan, 1 speed condenser fan. It does not have an inverter, that was a later model I believe.

A couple weeks after the repairs a new issue developed, the evaporator fan is slow to come up to speed. What’s happening is the compressor will kick on with condenser fan due to demand from the fridge or the freezer, but the evaporator fan will rotate very slowly and hum, and then a few minutes later in some cases more than a few, it’ll spin up to high speed and once running it will ramp down to its mid speed before shutting off.

Tech has the service guide for the unit, checked the wiring between the controller board in the mechanical cabinet above, into the freezer evap motor plug and all four wires with good continuity. The fan motor was replaced, no change. Checking out the controller reading tV DC on the yellow wire goes to 12 V when it kicks on and runs in its high speed, but before that it’s just a 1-2V which seems low based on the service guide. After the fan gets up to speed in Hymo mode it’ll ramp down and the yellow wires at 9 V, and the blue rpm wire is reading 190 and high and 150 Hz in low. After the fan gets up to speed in hi mode it’ll ramp down and the yellow wires at 9 V, and the blue rpm wire is reading 190 and high and 150 Hz in low.

So question is, looking at a controller board to be installed in the morning is there anything else you all would recommend looking into. Tech is good with meters.

No issue with cooling after the new compressor, keeps temperature very well. The old one had lost compression.

thanks
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
134,104
Location
Redmond, Oregon
Hi, you are correct, the motherboard is the culprit.

Here's the motherboard for your model:
Main Control Board WR55X11130


Let us know how it goes.

Jake
 

Azmcarroll

Premium Member
Joined
Mar 22, 2022
Messages
11
Location
Phoenix
Thanks Jake. Yes the new control board fixed the issue with the evap fan, and overall the system runs super smooth, the compressor and the fans. It’s really like a whole new refrigerator.

One question has come up. The system had a run capacitor wired to the compressor originally. With the compressor replacement the run capacitor was removed as the compressor instructions apparently said run a capacitor is not needed. Just wanted to double check if that if there’s anything more to recommend there because when I look at the compressor sheet online at this point I find a run capacitor part number listed. The compressor kit was a GE part number, believe it was picked up locally.

Michael
 

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Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
134,104
Location
Redmond, Oregon
Yes the new control board fixed the issue with the evap fan, and overall the system runs super smooth, the compressor and the fans. It’s really like a whole new refrigerator.
Excellent Michael, glad to hear the new motherboard fixed it.(y)

One question has come up. The system had a run capacitor wired to the compressor originally. With the compressor replacement the run capacitor was removed as the compressor instructions apparently said run a capacitor is not needed.
That's correct, the run capacitor is not needed. A run capacitor helps the compressor run more efficiently and it's not really necessary. The compressor will run properly without it.

Jake
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
134,104
Location
Redmond, Oregon
Anytime Michael!

Jake
 
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