My central heating system is controlled by the above programmer. During cold weather it sometimes switches itself from automatic setting to a continuous operation. Can anyone suggest why this should happen and perhaps propose a solution. Thanks
Honeywell ST9400C programmer
- Thread starter redrag
- Start date
Frost stat somewhere?
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
