Universal diagnostic library

Heat-pump problems by mode and operating state

Behavior changes with outdoor temperature, thermostat configuration and defrost.

Exact identityDirect answerSafe checksEvidenceStop condition

Reviewed records

1 exact answers

Heat pump auxiliary or emergency heat stays on

Auxiliary heat may be normal in cold weather, defrost or large temperature recovery. It is suspicious when it remains active in mild weather after setpoint is reached.

Open record

Structured depth, not empty permutations

Every published record carries a direct answer, scope, ordered fixes, risk notes and sources.

Device and manufacturer hubs share a consistent record system, but each answer carries the relevant controls, fault boundaries, consequences and official support entry point for that platform.

See the publication gate