Honeywell Home ST9400C 7-Day 2-Channel Digital Programmer for Heating & Hot Water Control
The Honeywell Home ST9400C 7-Day Programmer features independent heating and hot water scheduling, 3 daily cycles, and a LoT™ display, offering universal compatibility and energy-efficient automation.
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- Estimated Delivery: For most items (over 99% of our products), orders placed before 3pm on working days will be dispatched the same day with our Fast DELIVERY 1st class service. For the rare items not immediately in stock, dispatch may take 1-3 working days after receiving your order. If your order cannot be dispatched the same day, we will notify you via email.
The Honeywell Home ST9400C is a versatile 7-day, 2-channel digital programmer designed to deliver precise control over central heating and stored hot water systems. With full independent scheduling, it allows you to tailor daily routines using up to three on/off cycles per day for each channel.
Ideal for use with all boiler types, the ST9400C fits directly onto the industry-standard backplate and is a direct replacement for previous ST6400 models, making it perfect for retrofits or upgrades.
A standout feature is the LoT™ (Line of Text) display, which provides easy-to-follow, real-time guidance directly on the screen—no user manual required. Other advanced functions include automatic summer/winter time change, holiday mode for frost protection, and override options for temporary changes without reprogramming.
With a focus on energy savings, usability, and universal compatibility, the ST9400C is a smart upgrade for homeowners seeking reliable and efficient heating control.
Key Features
• 7-Day Programmable Schedule — Customize heating and hot water timings for each day
• Independent Heating and Hot Water Control — Separate programs for full flexibility
• Three On/Off Cycles Per Day — Set multiple heating periods to suit your routine
• LoT™ Display Technology — Step-by-step text display for simple operation
• Automatic Time Change — Adapts to daylight savings without manual adjustment
• Holiday Mode — Maintains frost protection while you’re away
• Override and Extra Hour Features — Boost heating or hot water without changing the schedule
• Wall-Mounted and Mains-Powered — Easy to install using standard backplate
• Energy-Efficient Operation — Helps reduce utility bills with optimized programming
• 1 Year Warranty — Reliable and backed by manufacturer support
Applications
• Central Heating and Hot Water Scheduling — Ideal for modern home systems
• Retrofit and Upgrades — Direct ST6400 replacement using standard backplate
• Boiler-Agnostic Compatibility — Works with all major boiler types
• User-Friendly Heating Control — Great for homes needing simple but powerful scheduling
• Seasonal Energy Management — Reduces unnecessary heating through timed automation
Technical Specifications:
| Feature | Details |
|---|---|
| Brand | Honeywell Home |
| Product Name | Honeywell Home ST9400C 7-Day 2-Channel Digital Programmer |
| Product Code | ST9400C |
| Compatible Boiler Type | All Boilers |
| Power Supply | 230V Mains-Powered |
| Max Load (Inductive) | 3A |
| Max Load (Resistive) | 3A |
| Switching Type | SPDT |
| Number of Programs | 7-Day, 5/2-Day, or 1-Day |
| Override Options | Temporary & Permanent Override |
| Special Features | LoT™ Display, Holiday Mode, Auto Time Change |
| Installation Type | Wall-Mounted |
| Dimensions | H 99mm x L 145mm x P 35mm |
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