The heating and hot water programmes are completely independent to allow the system to be operated in the most energy efficient manner possible. The clock can be reset easy, the problem is the instruction book fails to mention that the controls to do so are under a simple hinged drop down cover on the front of the unit, then follow the instruction book. Afghanistan, Algeria, American Samoa, Angola, Anguilla, Antigua and Barbuda, Argentina, Armenia, Aruba, Azerbaijan Republic, Bahamas, Bahrain, Bangladesh, Barbados, Belize, Benin, Bermuda, Bhutan, Bolivia, Botswana, Brazil, British Virgin Islands, Brunei Darussalam, Burkina Faso, Burundi, Cambodia, Cameroon, Cape Verde Islands, Cayman Islands, Central African Republic, Chad, Chile, China, Colombia, Comoros, Cook Islands, Costa Rica, Côte d'Ivoire (Ivory Coast), Democratic Republic of the Congo, Djibouti, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Ethiopia, Falkland Islands (Islas Malvinas), Fiji, France, French Guiana, French Polynesia, Gabon Republic, Gambia, Georgia, Germany, Ghana, Greenland, Grenada, Guadeloupe, Guam, Guatemala, Guinea, Guinea-Bissau, Guyana, Haiti, Honduras, Hong Kong, India, Indonesia, Iraq, Israel, Jamaica, Japan, Jordan, Kazakhstan, Kenya, Kiribati, Kuwait, Kyrgyzstan, Laos, Lebanon, Lesotho, Liberia, Libya, Macau, Madagascar, Malawi, Malaysia, Maldives, Mali, Marshall Islands, Martinique, Mauritania, Mauritius, Mayotte, Mexico, Micronesia, Mongolia, Montserrat, Morocco, Mozambique, Namibia, Nauru, Nepal, Netherlands Antilles, New Caledonia, New Zealand, Nicaragua, Niger, Nigeria, Niue, Oman, Pakistan, Palau, Panama, Papua New Guinea, Paraguay, Peru, Philippines, Puerto Rico, Qatar, Republic of the Congo, Reunion, Russian Federation, Rwanda, Saint Helena, Saint Kitts-Nevis, Saint Lucia, Saint Pierre and Miquelon, Saint Vincent and the Grenadines, Saudi Arabia, Senegal, Seychelles, Sierra Leone, Singapore, Solomon Islands, Somalia, South Africa, South Korea, Sri Lanka, Suriname, Swaziland, Taiwan, Tajikistan, Tanzania, Thailand, Togo, Tonga, Trinidad and Tobago, Tunisia, Turkey, Turkmenistan, Turks and Caicos Islands, Tuvalu, Uganda, United Arab Emirates, Uruguay, Uzbekistan, Vanuatu, Venezuela, Vietnam, Virgin Islands (U. The ST9400A does not directly control the temperature but works together with other temperature controls, such as room thermostats and cylinder thermostats, to control your heating and hot water system in your home.

I would have fitted the new one anyway, but I know some people are nervous about wires and electricity. The 103 third parties who use cookies on this service do so for their purposes of displaying and measuring personalized ads, generating audience insights, and developing and improving products.All Honeywell ST9400 models incorporate the Line of Text (LoT™) display that gives clear plain English instructions whenever any button or slider is used. When I got around to checking the programming, I found that the pre installed settings were very sensible and similar to what I would nomally use. Just one niggle, when the display is lit by a clear blue sky during the day the display shows dark patches.

Extra Large LCD (Liquid Crystal Display) with Backlight provides added user friendliness and clearer viewing – even in the dark. So when it started to play up (The pump would come on but the boiler wouldn't trigger) I decided the controller had gone wrong (despite a plumber telling me it was just air in the heating system). The unit is a 1 day full programmer with two on/off switching times per day (which can be increased to 3). Your Honeywell ST9400A provides timing control for both your central heating and hot water systems, letting you set ON and OFF periods to suit your own lifestyle.Please note that if the item requires testing your refund will take approximately 14 days from receipt at Adlink UK Limited. T echnologies Sarl, Ecublens, Route du Bois 37, Switzerland by its Authorised Representative Honeywell Inc. The better your problem and question is described, the easier it is for other Honeywell owners to provide you with a good answer.