An Emerson 918-0043-00 Heater moderates compressor temperature to discourage refrigerant migration and protect the system during off cycles.
The heater warms the compressor crankcase to keep refrigerant from migrating into the oil during off cycles, supporting smoother startup and more stable operation in a heating and cooling system. Its 240V, 70W design matters because it delivers controlled heat for this protective function without excessive power draw, which can reduce oil dilution and internal compressor wear.
The heater may be failing if the heating and cooling unit has hard starts, noisy compressor operation or reduced reliability after long shutdown periods. Physical signs can include damage to the heater body or wiring and you might notice environmental signs such as refrigerant migration issues, unusually cold compressor surfaces or oil foaming at startup.
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