Domain Scheduling

Domain: Scheduling (0x03)

3.1 Schedule Settings

COS	Yes
Access	R/W
Data length	1 byte

Byte	Field	Values
0	Program type	0 Programmable (default), 1 Non-programmable

Disabling the program keeps current setpoints until changed via protocol or UI.

3.2 Away Settings

COS	Yes
Access	R/W
Data length	3 bytes

Byte	Field	Values
0	Away fan	1 On, 2 Auto, 3 Circ
1	Away heat index	0→15.5 °C … 5→18.5 °C (see table)
2	Away cool index	0→26.5 °C … 5→29.5 °C

Heat index map

Index	°C	approx °F
0	15.5	60
1	16	61
2	16.5	62
3	17	63
4	17.5	64
5	18.5	65

Cool index map

Index	°C	approx °F
0	26.5	80
1	27	81
2	27.5	82
3	28.5	83
4	29	84
5	29.5	85

Defaults (guide bold): Fan 2 Auto, Heat index 2 (62 °F), Cool index 5 (85 °F).

Guide oddity: the heat index map jumps from 4 → 17.5 °C to 5 → 18.5 °C, skipping 18.0 °C. This matches the conversion table (64 °F → 17.5 °C, 65 °F → 18.5 °C by the first-entry rule) but means 18.0 °C is not representable here. See Guide Errata.

3.3 Schedule Day

COS	Yes
Access	R/W
Data length	21 bytes
Read selector	Required — day index as Read Request data: 0–6 = Sunday–Saturday

Programs the four daily events (Wake, Leave, Return, Sleep). Events are ordered by start time, not event name. Deadband violations on write are rejected with a NACK (out of range) when the thermostat is in Auto — unlike Setpoint & Mode 2.1, which auto-corrects.

Payload

Field	Byte	Values
Day	Byte 0	0: Sunday 1: Monday 2: Tuesday 3: Wednesday 4: Thursday 5: Friday 6: Saturday 7: Week days (value is not valid during a read request) 8: Weekend days (value is not valid during a read request) 9: All Days (7) (value is not valid during a read request) 10-255: Reserved
Wake Start Minute	Byte 1	0 – 59: Minute60-255: Reserved
Wake Start Hour	Byte 2	0-23: Hour24-255: Reserved
Wake Fan	Byte 3	0: Reserved 1: On 2: Auto 3: Circ 4-255: Reserved
Wake Heat Setpoint	Byte 4	bits 7: Heat Setpoint Sign 0: Positive 1: Negative bits 6: Heat Setpoint ½ Celsius Indicator 0: “.0” Celsius 1: “.5” Celsius bits 5-0: Heat Setpoint in Celsius (refer to appendix on for C / F conversion) 0-3: Reserved (out of range)4-32: Heat Setpoint 32-63: Reserved (out of range)
Wake Cool Setpoint	Byte 5	bits 7: Cool Setpoint Sign 0: Positive 1: Negative bits 6: Cool Setpoint ½ Celsius Indicator 0: “.0” Celsius 1: “.5” Celsius bits 5-0: Cool Setpoint in Celsius (refer to appendix on for C / F conversion) 0-9: Reserved (out of range)10-37: Cool Setpoint 38-63: Reserved (out of range)
Leave Start Minute	Byte 6	0 – 59: Minute 60-255: Reserved
Leave Start Hour	Byte 7	0-23: Hour24-255: Reserved
Leave Fan	Byte 8	0: Reserved 1: On 2: Auto 3: Circ 4-255: Reserved
Leave Heat Setpoint	Byte 9	bits 7: Heat Setpoint Sign 0: Positive 1: Negative bits 6: Heat Setpoint ½ Celsius Indicator 0: “.0” Celsius 1: “.5” Celsius bits 5-0: Heat Setpoint in Celsius (refer to appendix on for C / F conversion) 0-3: Reserved (out of range)4-32: Heat Setpoint 32-63: Reserved (out of range)
Leave Cool Setpoint	Byte 10	bits 7: Cool Setpoint Sign 0: Positive 1: Negative bits 6: Cool Setpoint ½ Celsius Indicator 0: “.0” Celsius 1: “.5” Celsius bits 5-0: Cool Setpoint in Celsius (refer to appendix on for C / F conversion) 0-9: Reserved (out of range)10-37: Cool Setpoint 38-63: Reserved (out of range)
Return Start Minute	Byte 11	0 – 59: Minute 60-255: Reserved
Return Start Hour	Byte 12	0-23: Hour24-255: Reserved
Return Fan	Byte 13	0: Reserved 1: On 2: Auto 3: Circ 4-255: Reserved
Return Heat Setpoint	Byte 14	bits 7: Heat Setpoint Sign 0: Positive 1: Negative bits 6: Heat Setpoint ½ Celsius Indicator 0: “.0” Celsius 1: “.5” Celsius bits 5-0: Heat Setpoint in Celsius (refer to appendix on for C / F conversion) 0-3: Reserved (out of range)4-32: Heat Setpoint 32-63: Reserved (out of range)
Return Cool Setpoint	Byte 15	bits 7: Cool Setpoint Sign 0: Positive 1: Negative bits 6: Cool Setpoint ½ Celsius Indicator 0: “.0” Celsius 1: “.5” Celsius bits 5-0: Cool Setpoint in Celsius (refer to appendix on for C / F conversion) 0-9: Reserved (out of range)10-37: Cool Setpoint 38-63: Reserved (out of range)
Sleep Start Minute	Byte 16	0 – 59: Minute 60-255: Reserved
Sleep Start Hour	Byte 17	0-23: Hour24-255: Reserved
Sleep Fan	Byte 18	0: Reserved 1: On 2: Auto 3: Circ 4-255: Reserved
Sleep Heat Setpoint	Byte 19	bits 7: Heat Setpoint Sign 0: Positive 1: Negative bits 6: Heat Setpoint ½ Celsius Indicator 0: “.0” Celsius 1: “.5” Celsius bits 5-0: Heat Setpoint in Celsius (refer to appendix on for C / F conversion) 0-3: Reserved (out of range)4-32: Heat Setpoint 32-63: Reserved (out of range)
Sleep Cool Setpoint	Byte 20	bits 7: Cool Setpoint Sign 0: Positive 1: Negative bits 6: Cool Setpoint ½ Celsius Indicator 0: “.0” Celsius 1: “.5” Celsius bits 5-0: Cool Setpoint in Celsius (refer to appendix on for C / F conversion) 0-9: Reserved (out of range)10-37: Cool Setpoint 38-63: Reserved (out of range)

Day selector (Byte 0)

Value	Meaning
0–6	Sunday–Saturday
7	Weekdays (write only; not valid on read)
8	Weekend (write only; not valid on read)
9	All days (write only; not valid on read)

Event pattern

Each of Wake / Leave / Return / Sleep uses five bytes:

1. Start minute (0–59)
2. Start hour (0–23)
3. Fan (1 On, 2 Auto, 3 Circ)
4. Heat setpoint (packed temperature byte)
5. Cool setpoint (packed temperature byte)

See Temperature Encoding for setpoint bits.

Guide typo: heat setpoint ranges read "4-32: Heat Setpoint 32-63: Reserved" — overlapping at 32; presumed intent is 33–63 reserved. See Guide Errata.

3.4 Schedule Hold

COS	Yes
Access	R/W
Data length	10 bytes

Byte	Field	Values
0	Hold	0 Disabled, 1 Temporary, 2 Permanent, 3 Away, 4 Vacation
1	Fan	1 On, 2 Auto, 3 Circ
2	Heat SP	Packed temp (or Null when disabled)
3	Cool SP	Packed temp
4	DEH vacation	0 Off; 50–70 %RH when used
5	End minute	0–59
6	End hour	0–23
7	End date	1–31 (day of month)
8	End month	1–12
9	End year	Year − 2000 (0 = 2000)

Cancel hold: Hold = Disabled; all other fields Null.

COS causes: hold expire; timed lockout; user hold change; incremental SP; setpoint/mode write; lockout change cancelling hold.

NACK if DEH written when dehumidification not installed / wrong vacation config, or deadband violation.

3.5 Heat Blast™

COS	Yes
Access	R/W
Data length	1 byte

Byte	Field
0	0 Off, 1 On

Raises room temperature by installer offset (default 3 °), then returns to normal setpoint. NACK if room already too warm (over 85 °F). Cancel via Heat Blast off, cancel hold, or new hold.