Electrolux Refrigerator Service Manual page 6

The new evaporator batteries are not interchangeable with the old ones.
The evaporator batteries for the R134a version feature only one defrosting heater, while the evaporator batteries
for the R600a version feature two defrosting heaters connected in parallel for safety reasons of the product.
The thermal protections are connected in series to the defrosting heaters and are cabled together, therefore,
they are not interchangeable singularly. An assembly spare part no. is available in case of failure of a thermal
protector or of a defrosting heater.
NOFROST REFRIGERATORS WITH EXTERNAL ELECTRIC WIRING 6/25