FA-92382 / HVAC thermostat control / Member archive
Stage 2 restarts immediately after dropping out · case 02
The second stage cycles on and off every minute during a deep droop.
Case contract
Two-stage furnace thermostat sampled per minute. Stage 1 starts at temp <= setpoint - 1.0 F and ends at temp >= setpoint. Stage 2 requires stage 1 and starts either on droop (temp <= setpoint - 3.0 F) or after stage 1 has been on for more than 10 samples of the current cycle while still below setpoint - 0.5 F; it ends at temp >= setpoint - 0.3 F or when stage 1 ends, and cannot restart within 3 minutes of ending. Return [stage1, stage2] 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 fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| regression: stage two cycling late | [[true, true], [true, false], [true, true], [true, true], [true, true], [true, true], [true, true]] | [[true, true], [true, false], [true, false], [true, false], [true, true], [true, true], [true, true]] | Failed |
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