If they are battery powered, change the batteries in the units.
If they are hard wired and all are not powering up or, for example a whole floor has no display then check to see if you have a wiring centre. All of our wiring centres should at least have a power light. If the light is off and assuming it is not switched off at the fuse spur, it is possible that the internal fuse has blown inside the wiring centre to protect the wiring centre. At this point, we would suggest getting an electrician or heating engineer to investigate.
The fuse blowing is usually caused by something connecting to the board which is faulty, for example an actuator, pump or valve and therefore an electrician would need to test the external components before changing the fuse.
It is not recommended changing the fuse before the testing is done because if an external component is faulty and causing surges into the wiring centre, it could damage the wiring centre itself.
An electrician can ring us on 01254 669090, option 2, lines are open from 9am to 4:30pm Monday to Friday.
The following information is for the electrician only
- Replacement for a 5A fuse QUICK ACTING F HBC FUSE 5A 5X20 - RS NO 537-1408
- Replacement for a 2A fuse QUICK ACTING F HBC FUSE 2A 5X20 - RS 537-1177
- Replacement for a 800MA fuse FST 5X20FUSE F,L, 800MA 250VAC -RS NO 541-4369