FA-92823 / HVAC thermostat control / Member archive

Zoned system never serves a minority mode · case 03

A single zone calling heat waits indefinitely while two zones keep calling cooling.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Zoned single-unit system arbitration per minute; each sample maps zone -> heat, cool or None. When idle the system picks the mode with more calling zones (ties go to heat). A mode ends when no zone calls for it, and a new mode may be chosen in the same minute. If zones call for the opposite mode, the system switches once the current mode has run max_run minutes, restarting the run timer. Dampers open only for zones calling the active mode. Return [mode, sorted open zones] per minute.

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 3	`[["heat", ["z1", "z3"]], ["heat", ["z1", "z3"]], ["cool", ["z2", "z3"]], ["cool", ["z2", "z3"]], ["cool", ["z2", "z3"]], ["cool", ["z2", "z3"]], ["cool", ["z2", "z3"]], ["cool", ["z2", "z3"]], ["cool", ["z2", "z3"]], ["cool", ["z3", "z4"]], ["heat", ["z2", "z4"]]]`	`[["heat", ["z1", "z3"]], ["heat", ["z1", "z3"]], ["cool", ["z2", "z3"]], ["cool", ["z2", "z3"]], ["cool", ["z2", "z3"]], ["cool", ["z2", "z3"]], ["heat", ["z4"]], ["heat", ["z4"]], ["cool", ["z2", "z3"]], ["cool", ["z3", "z4"]], ["heat", ["z2", "z4"]]]`	Failed

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