Sime boilers are built to last, but from time to time, even the most dependable equipment can unfortunately go wrong. Whatever the problem, we’ve got you covered. Our technical helplines are manned by highly-trained professionals who will endeavour to diagnose and resolve faults over the telephone, and where necessary, arrange for an engineer visit.

Our promise

We will attend all in-warranty breakdown calls within two working days from the initial call for domestic boiler products and three working days for commercial products.


Technical assistance is also available via our technical support team Monday to Thursday between 8.30 am and 5.00 pm and 8.30 am to 3.45 pm on Friday. Please call 0345 901 1114 and select option 3 on the automated menu. Outside of these hours, you can email us on Our product managers are also active members of the Gas Chat Facebook group and are happy to answer your questions within this forum.

Alarm codes

Is your customer’s boiler showing an alarm code? Click here to find out what it means

When you call your technical service team, be sure to tell them the error code that the boiler is showing, as in many cases the problem can be fixed over the telephone.

Just need to look at a manual? All of our manuals are downloadable here.