How do I override the temperature limit on Emerson 1F95EZ-0671 thermostat

Different Nest thermostat models give you different options for setting up a temperature schedule that meets your needs:

• Auto-Schedule (Nest Thermostat E and Nest Learning Thermostat only)
• Basic Schedule (for Nest Thermostat E only)
• Quick schedule (Nest Thermostat only)

[PDF]Troubleshooting Common Thermostat Problems - Totaline

https://www.totaline.com/dl/troubleshooting_signature_star.pdf
When the temperature limit is exceeded, the furnace shuts off the burners ... buttonthermostats, hold Mode and Fan (or Mode and Override) for SEVEN seconds.

To override the temperature limits, simply remove the thermostat cover, and then carefully replace it again, making sure the pins line up correctly. That's it! You can now set the thermostat as low as 60° and turn fan to "On."

Yes. It appears the Sunvix SP2 is 2-channel timer.
http://www.sunvic.co.uk/documentation/Programmer_Select_207.pdf

Two-channel means CH central heat and WH water heater can be programmed separately, and each can have its own timing program.
pg 3

The timer offers pre-programmed options for both CH and WH, which can be used, or program your own schedule. chart pg 5 and steps pg 3

Limitations: both channels operate on same clock time, and dip switch setting. pg 6. So the WH cannot be programmed for 5-2 weekdays-weekends and CH programmed for 24 hour.
As a convenience for varied work schedules, Sometimes people use the 5-2 weekday-weekend option so 2 days of week can have different programming, and then fudge current day setting during the set-current-time step pg2 so the 'weekend days' are actually moved to wedsday-thursday instead of sat-sun.

Option: both CH and WH timer programs can be linked and follow same programming by using copy button. pg 5

Using advance button on either side of timer, pg 3-4, WH and CH timing schedules can be overridden temporarily until next set point is reached. Then regular programming automatically resumes.
If override or Advance button is pushed for either CH or WH, it reverses whatever programming is in effect. On becomes off, or off becomes on. However if CH thermostat is satisfied and room temperature has not fallen below thermostat set point, then override will not turn CH on, but override will turn CH off. Same for WH override: If cylinder thermostat is satisfied with internal water temperature, the water heater will not turn on and heat more water, but the override can turn water cylinder off.

Unit requires Cr2033 lithium button battery. Pg 6. Probably lasts 3-5 years. Programming is protected for 30 days from power outage.
If programming is lost, change battery, the reset timer and reprogram to restore functionality.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Are you sure about the model? Isnt listed in the Hunter Site: Thermostat User Manual.

According woth some operation manuals, you can access at Temporary Manual Override or Permanent Override settign (click the link and see page 6).

Hope this helps.

To set the temporary override, press arrows up or down to desired temp. This will keep temperature
at temporary setting for 2 hours then return to programming. To permanent override press MODE button until schedule period number disappears (number inside little house on stat). Then adjust temp with arrows. Press the MODE button again to cancel override and return to programmable.

Press and hold for about 1 second to enter Manual Override mode. When display flashes, you can release the key. ■ Press again to change to your desired Set Temperature. Hold the key for 2 seconds to fast-advance the Set Temperature. ■ Press to return to normal mode, or wait 5 seconds for it to return automatically. ■ The current program number will flash to signify the Temporary Override. ■ At the next program change time, the Temporary Override is cancelled, and the next program temperature becomes the setpoint temperature. To end the Temporary Manual Override: ■ Press and wait for HOLD to display on the LCD. ■ Press again. This will return the set temperature to the current program set temperature.