To start operating the 7-day programmable thermostat and select the correct operating modes, read user guide, which contains 18 pages in English. As this information is anonymised and aggregated it cannot be used to identify any individual user actions. The better your problem and question is described, the easier it is for other Honeywell owners to provide you with a good answer. While the above solutions are based on expert suggestions and might address the problem with the Honeywell ST9400C, it’s crucial to consult with a professional when diagnosing and resolving issues with your heating and hot water system.

Honeywell Home ST9400C 7 Day 2 Channel Programmer - 19259 Honeywell Home ST9400C 7 Day 2 Channel Programmer - 19259

Features user friendly text instructions (LoT™), large backlit display, automatic summer/winter change and override. I’ve replaced heating motorised valve and changed the programmer (Honeywell st9400c) but still the problem persists. Setting times for central heating and hot water to switch on and off can help reduce your home's energy consumption. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development.Follow links through to various manufacturers sites, as each manufacturer will have its own terms and conditions for qualifying for longer warranties. It offers up to three ON/OFF switchings per day, plus each day can be programmed differently on a 5/2 or 1 day basis making it ideal for users whose heating needs vary from day to day. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Power Supply Examination: Without a detailed circuit diagram for the ST9400C, another expert suspected that the problem might lie in the power supply section of the device. The Honeywell ST9400C, known for its reliable performance in controlling central heating and hot water systems, is a programmer preferred by many.

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Replacement: A straightforward solution proposed by several experts is simply to replace the malfunctioning programmer. A user with a 12-year-old CH/Water system, equipped with an Ideal Icos HE18 boiler, a hot water cylinder, a pump, a 3-way motorised valve, and a Honeywell ST9400C programmer, encountered issues after accidentally puncturing a pipe. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Following the system’s repair and restoration, the Honeywell ST9400C began exhibiting signs of malfunction.The main purpose of the Honeywell ST9400C thermostat is to regulate the temperature in the room where it is installed. They are used only by Mr Central Heating or the trusted partners we work with, where they are used for marketing, statistics and personalised ads. The pump seemed to run correctly, and the motorised valve also appeared to function, but the programmer continued its on/off cycling.