Which risk increases when a residential heat pump's defrost cycle malfunctions?

💡 Explanation

Excessive evaporator coil icing occurs because the defrost cycle normally initiates thermal reversal, melting ice via hot refrigerant; therefore, ice accumulates, restricting airflow and significantly reduces heating capacity, rather than compressor/motor related failures.

• Which consequence results when icing disrupts airflow over an aircraft's ailerons just before touchdown?
• Which outcome occurs when a refrigeration system uses a refrigerant with high global warming potential during a leak?
• Which outcome directly affects an aircraft's control surfaces following icing that exceeds anti-ice system capacity?
• Which outcome occurs when a hydraulic pump operates with excessive entrained air in its fluid?
• Which risk sharply increases within electrical substation transformers when internal fault current exceeds circuit breaker interrupting capacity?
• Which outcome occurs when chromatic dispersion distorts the optical signal in a long-distance fiber link nearing maximum bit-rate?