• Please note, some of the links on our site are affiliate links (Learn More)

GE Mongram ZISS480DRCS compressor short cycling

wahlcoman

Premium Member
Joined
Jan 3, 2010
Messages
23
Location
Phoenix, AZ
Model Number
ZISS480DRCS
Brand
GE
Age
More than 10 years
I have a 13 year old GE Monogram refrigerator. Initially, it did not cool (both fridge and freezer at 72) and a local technician came and diagnosed that the compressor appeared OK, but the invertor would need to be replaced. I replaced this (updated, improved version) and now after 3 days the freezer is at 37 degrees and the fridge at 57. The compressor short cycles coming on for approx. 3-4 minutes every 8-10 minutes. The Embraco VEGT 8H compressor does make a slight rattle type noise when on. Does this compressor need to be replaced or could the refrigerant level be low? The motherboard looks to be OK as all lights come on and evap fan stays on.
 

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
44,788
Location
Murray, Utah 84107, United States
It's impossible to tell if the motherboard is good just by looking at it. The motherboard controls the compressor and compressor speed by sending a signal voltage to the inverter. When checking inverter voltage output, connect the test-meter leads to any 2 of the 3 compressor lead wires at the inverter plug (plug should be connected). The same reading should be measured between any 2 of the 3 wires. The inverter controls compressor speed by frequency variation and by Pulse Width Modulation (PWM). Changing frequency and PWM will cause an effective voltage between 80 VAC and 230 VAC to be received at the compressor.
The inverter receives commands from the main control board. The main control board will send a PWM run signal from the J15 connector of between 4 VDC -6 VDC effective voltage to the inverter (all wires must be connected). The inverter will select compressor speed (voltage output) based on this signal. The main control board will only send a run signal to the inverter when the compressor should be on.
Note: When measuring signal voltage (from the main control board) at the inverter, a reading of 4-6 VDC will be measured with all wires connected.
The inverter will monitor compressor operation and if the compressor fails to start or excessive current draw (4 amps maximum) is detected, the inverter will briefly stop voltage output. The inverter will then make 12 consecutive compressor start attempts (once every 12 seconds). After 12 attempts, if the compressor has not started, an 8-minute count will initiate. After the 8-minute count, the inverter will attempt to start the compressor again. If the compressor starts, normal operation will resume. If the compressor fails to start, this process will be repeated. Removing power to the unit will reset the inverter count. When power is restored, the inverter will attempt to start the compressor within 8 seconds.
 
If you feel that you have benefited from this site, and would like to show your appreciation.
Top