--- product_id: 48345105 title: "ST9400C Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White - Bulk Package" brand: "honeywell" price: "€ 177.45" currency: EUR in_stock: true reviews_count: 8 category: "Honeywell" url: https://www.desertcart.pt/products/48345105-st9400c-programmer-7-2-channel-3-on-off-per-day store_origin: PT region: Portugal --- # Largest ever backlight display Direct replacement, no rewiring 7-day programmable precision ST9400C Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White - Bulk Package **Brand:** honeywell **Price:** € 177.45 **Availability:** ✅ In Stock ## Summary > 🔥 Upgrade your heating game with zero downtime 🕒 ## Quick Answers - **What is this?** ST9400C Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White - Bulk Package by honeywell - **How much does it cost?** € 177.45 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/48345105-st9400c-programmer-7-2-channel-3-on-off-per-day) ## Best For - honeywell enthusiasts ## Why This Product - Trusted honeywell brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Dual Channel Control:** Manage heating and hot water independently with 3 on/off cycles daily. - • **Smart Time Management:** Automatic summer/winter clock adjustment keeps your schedule flawless. - • **Effortless Programming:** Intuitive push-button interface with a clear backlit LCD for quick setup. - • **Future-Ready Compatibility:** Works seamlessly with Honeywell thermostats and zone valves for full system automation. - • **Seamless Upgrade Experience:** Fits existing ST6400 backplate—ditch rewiring and extra hassle. ## Overview The Honeywell ST9400C Programmer is a 7-day, 2-channel digital heating controller featuring the largest backlit display in its class. Designed as a direct replacement for the ST6400 series, it installs effortlessly without rewiring. With automatic daylight saving adjustments and programmable on/off cycles, it offers precise, customizable control for heating and hot water systems. Compatible with Honeywell’s ecosystem, it enables smart, automated home comfort management. ## Description Product Description The ST9400C in a 7-day Electronic Programmer which provides accurate time control for central heating systems with separate programmes for heating and hot water. ST9400C is suitable for replacing a wide range of programmers on the market and is a direct replacement for Honeywell ST6400 Programmers without the need for re-wiringThis Version replaces some of the following previous Honeywell Models: ST6400C1003 ST6400C1052.St9400 programmers can be combined with other Honeywell Controls such as Room Thermostats, Cylinder Thermostats, Wiring Centres and Zone or Diverting Valves to form a fully automatic central heating control system.Legal DisclaimerAny circuit boards cannot be returned if seal has been broken as incorrect diagnostics could cause damage to these parts. Legal Disclaimer Please check your local laws before purchasing this product. All manufacturers Terms and Conditions apply. Please see Manufacture of product website for full details before buying. PLEASE READ AND FOLLOW ALL INSTRUCTIONS. Box Contains 1 x ST9400C1000 Programmers Review: Solid unit and easy it replace a faulty one - Bought to replace a faulty unit. Super easy to replace as the wiring is on the back plate that doesnt need to be changed Review: Great replacement for the Honeywell ST6400C - Easy and simple to install and programme. - I brought the ST9400C to replace the ST6400C which had seen better days. The ST9400C is a direct replacement for the ST6400C and as such has been cleverly designed to sit on the same back plate as the ST9400C. This means no need to rewire, drill new holes or the need to call a plumber. All you do slacken two securing screws at the bottom of the ST9400C hinge the unit up to separate the backplate and main body of the ST9400C into two halves. You do the same process on the ST6400C, switch off your electricity supply at the mains and simply fit the ST9400C main body onto the existing ST6400C backplate. It is as simple as that, jobs done, hassle free and quick. The ST9400C unit comes complete with a simple to follow ‘quick programming guide’ which really makes light work of programming your hot water and heating needs. From start to finish I had replaced my old ST6400C with the new ST9400C and programmed it in no more the 15mins. I love the fact that the ST9400C even adjusted itself when the clock’s went back for winter. If I had to criticise anything it would be that the buttons do sometimes tend to stick behind the plastic body of the ST9400C, however pressing the buttons delicately seemed to solve the issue. I highly recommend the ST9400C. I have read issues about reliability of the ST9400C but since installing the unit about a month ago I have not had a single problem. ## Features - Now with LoT Technology - Our Largest ever Backlight Display - Factory set Clock - Automatic Summer/Winter time change - 7 Day or 5/2 Day operation - Product may comes in white box or plastic package ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B003DV6ACA | | Backlight | Yes | | Best Sellers Rank | 38,231 in DIY & Tools ( See Top 100 in DIY & Tools ) 5,047 in Heating & Cooling | | Brand | Honeywell | | Brand Name | Honeywell | | Colour | White | | Connectivity Protocol | Wi-Fi | | Connectivity Technology | Wi-Fi | | Control Method | Touch | | Control Type | Button Control | | Controller Type | Push Button | | Controller type | Push Button | | Customer Reviews | 4.5 out of 5 stars 869 Reviews | | Display Type | LCD or LED with backlight | | Finish Type | Matte | | Global Trade Identification Number | 05025121388412 | | Included Components | 2 unknown batteries | | Item Dimensions D x W x H | 35D x 145W x 99H centimetres | | Item Shape | Rectangular | | Item Type Name | Programmer. 7 day, 2-channel, 3 on/off per day | | Item Weight | 290 Grams | | Manufacturer | Honeywell | | Manufacturer Part Number | ST9400C | | Material Type | Plastic | | Model Name | ST9400C | | Model Number | ST9400C | | Model name | ST9400C | | Mounting Type | Wall Mount | | Number of Batteries | 2 Unknown batteries required. | | Power Source | Corded Electric | | Product Style | Modern | | Product dimensions | 35D x 145W x 99H centimetres | | Special Features | Programmable | | Special feature | Programmable | | Specific Uses For Product | Indoor use only | | Specification Met | 2006/95EC and 2004/108/EC | | Temperature Control Type | Digital | | UPC | 772040469917 | | Unit Count | 1.0 count | | Voltage | 24 | ## Product Details - **Brand:** Honeywell - **Colour:** White - **Connectivity technology:** Wi-Fi - **Controller type:** Push Button - **Included components:** 2 unknown batteries - **Model name:** ST9400C - **Product dimensions:** 35D x 145W x 99H centimetres - **Special feature:** Programmable - **Specific uses for product:** Indoor use only - **Temperature Control Type:** Digital ## Images ![ST9400C Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White - Bulk Package - Image 1](https://m.media-amazon.com/images/I/51OIxwl6IlL.jpg) ![ST9400C Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White - Bulk Package - Image 2](https://m.media-amazon.com/images/I/510TVVaiKmL.jpg) ## Questions & Answers **Q: will this replace a honewell st6400c programer ??** A: I had a ST6400C an I purchased this item and it fitted exactly. There are two screws at the base and when the ST6400C was removed the replacement fitted in its place. I was given the information initially by my service engineer **Q: The description says: "now with lot technology". (that's capital l and capital t, but this site changes them to small l t!) what is lot technology?** A: LoT means "Line of Text" and refers to the programmer display in response to any button pressed or slider moved. It enables an installer or user to set the programmer without needing to refer to a manual. **Q: I presume this is hard wired to the boiler. Where can I get a wireless version of it?** A: Sorry try the Honeyline technical help email they were v helpful **Q: Dose this controller replace the potterton 2002** A: Yes, the Honeywell ST9400c is logically similar to the Potterton 2002, so could be used as a replacement. However you will need to replace the backplate (fixed to your wall) and the order of the wires will change ~ this should not be a problem for your electrician ~ if you intend to replace the backplate yourself make sure you connect the wires to the correct terminals. The ST9400C comes complete with a new backplate. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Solid unit and easy it replace a faulty one *by A***E on 14 May 2026* Bought to replace a faulty unit. Super easy to replace as the wiring is on the back plate that doesnt need to be changed ### ⭐⭐⭐⭐⭐ Great replacement for the Honeywell ST6400C - Easy and simple to install and programme. *by R***L on 16 November 2013* I brought the ST9400C to replace the ST6400C which had seen better days. The ST9400C is a direct replacement for the ST6400C and as such has been cleverly designed to sit on the same back plate as the ST9400C. This means no need to rewire, drill new holes or the need to call a plumber. All you do slacken two securing screws at the bottom of the ST9400C hinge the unit up to separate the backplate and main body of the ST9400C into two halves. You do the same process on the ST6400C, switch off your electricity supply at the mains and simply fit the ST9400C main body onto the existing ST6400C backplate. It is as simple as that, jobs done, hassle free and quick. The ST9400C unit comes complete with a simple to follow ‘quick programming guide’ which really makes light work of programming your hot water and heating needs. From start to finish I had replaced my old ST6400C with the new ST9400C and programmed it in no more the 15mins. I love the fact that the ST9400C even adjusted itself when the clock’s went back for winter. If I had to criticise anything it would be that the buttons do sometimes tend to stick behind the plastic body of the ST9400C, however pressing the buttons delicately seemed to solve the issue. I highly recommend the ST9400C. I have read issues about reliability of the ST9400C but since installing the unit about a month ago I have not had a single problem. ### ⭐⭐⭐⭐⭐ Bringing Warmth Back To A Frozen House! *by R***S on 5 October 2016* Bought as a replacement for a simpler (and possibly even prehistoric) Honeywell controller that had died rather suddenly after many many years of service (and left us without heating or hot water until we figured out the problem). The controller is simple to install (I used a wiring chart that I found online that detailed how the wiring on the new controller related to the wiring on the old controller) and even simpler to operate. The LCD screen is bright and clear and informative - the default setting is to have the screen lit, but it will remain lit at all times (a little disconcerting initially). There are a host of settings that can be tweaked (including whether the LCD display is lit or not), and even the programming of the device is simple, making it easy to have different settings for each day or to copy the settings from one day to the next. There are even built in programs that you can use if you don't want to set your own. Simple to use, not unpleasant to look at, quick and easy to fit (at least as a replacement) & (so far at least) reliable. ## Frequently Bought Together - HONEYWELL ST9400C Thermostat Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White, 1 - Honeywell T6360B1028 Room Thermostat, 230/240V, White, 1 - Honeywell L641A1039 Cylinder Stat, 230 V --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/48345105-st9400c-programmer-7-2-channel-3-on-off-per-day](https://www.desertcart.pt/products/48345105-st9400c-programmer-7-2-channel-3-on-off-per-day) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-07-07*