FA-92417 / HVAC thermostat control / Member archive

Heat pump compressor lockout has no release differential · case 02

Near the balance point the compressor and auxiliary heat swap every sample as outdoor temperature jitters.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Heat pump with electric auxiliary heat; samples are [indoor, outdoor, mode] in tenths F. The compressor is locked out when outdoor < comp_lockout and released when outdoor >= comp_lockout + 2.0 F. Stage 1 demand is indoor < sp - 1.0 F, stage 2 is indoor < sp - 3.0 F. Emergency mode: no compressor, aux on stage-1 demand. Compressor locked out: aux replaces it on stage-1 demand regardless of the aux lockout. Otherwise the compressor serves stage 1 and aux serves stage 2 only when outdoor <= aux_lockout. Return [compressor, aux] per sample.

Why this case matters

Residential and light-commercial thermostats make these decisions sample by sample; each defect changes equipment calls in a way that shows up as short cycling, comfort complaints or equipment stress.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: scenario 13	`[[false, false], [false, true], [true, true], [false, false], [false, true], [false, true], [false, false], [true, true], [true, false], [true, true], [true, true]]`	`[[false, false], [false, true], [false, true], [false, false], [false, true], [false, true], [false, false], [true, true], [true, false], [true, true], [true, true]]`	Failed

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