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The Honeywell ST9400A is designed for homeowners and building managers seeking reliable and compliant heating control. Its key benefit is the large, backlit display and automatic Summer/Winter time adjustment, simplifying scheduling. A potential consideration is its requirement to fit industry-standard backplates, which may limit installation flexibility in non-standard setups. This programmer offers automatic time changes, fits standard backplates, and is compliant with building regulations.
| Colour | White |
|---|---|
| Model Part Number | ST9400A1002 |
| Brand | Honeywell |
The ST9400A features automatic Summer/Winter time changes, so it adjusts itself. For initial setup or manual override, refer to the programming guide. Typically, you would access the time setting menu using the buttons on the device.
Yes, the ST9400A is designed to fit industry-standard blackplates and is backward compatible, making it a suitable replacement for many existing programmers.
Please refer to the product packaging or Honeywell's official website for the most current warranty information, as it can vary by region and retailer.
The ST9400A allows for different programming schedules for weekdays and weekends. You will need to navigate through the programming menus to set specific times and temperatures for each period.
Yes, the Honeywell ST9400A features a large backlit display for improved visibility.
Most standard programmers, including the ST9400A, require a neutral wire for operation. Always confirm with the installation manual and your specific system requirements.
Check that the mains power to the heating system is switched on and that the fuse or circuit breaker has not tripped. Verify wiring connections.
Ensure the correct program is selected and that the time settings are accurate. Check the wiring between the programmer, boiler, and thermostat for any faults or loose connections.
Verify that the unit has been programmed correctly and that the time change function is enabled in the settings. Manual reset might be required if the feature was not active during the transition.
Consult the product manual for a specific list of error codes and their corresponding solutions. Common solutions involve checking power and system connections.
Setup: The ST9400A is designed to fit standard industry backplates, simplifying the installation process. Ensure the power supply is switched off at the mains before attempting any wiring. Follow the wiring diagram provided in the installation manual carefully, connecting the appropriate wires for your heating system (e.g., live, neutral, switched live, boiler control). Once wired, restore power and proceed with initial programming.
Compatibility: This unit is built to be backward compatible and compliant with building regulations, making it suitable for a wide range of existing domestic heating systems. It is designed to work with typical boiler and thermostat wiring configurations.
Care: Keep the unit clean by wiping it gently with a dry or slightly damp soft cloth. Avoid using abrasive cleaners or solvents, as these can damage the casing and display. Ensure ventilation around the unit is not obstructed.
