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Thanks for your thoughts on this. Re some of the questions. the mat is approx. 14 square metres, it runs through the hall into the kitchen. I have not found any hot spots when it was running, and I now can't get it running long enough for it to really start warming up much. I believe (but not...

Yeah, I will have to consider dumping the UFH as it is a costly nightmare ripping it up and doing it all over again. I am hoping that there may be some reasonably cheap way to determine the problem so I can make a sensible decision. For example if the mat is faulty and the problem spot could be...

Thanks to both of you for quick replies. To answer your questions in order. There is a programmer and thermostat combined - I have just tried bypassing it as suggested and the result is the same, 13a fuse blown after a few minutes. The heating mat is a fixed length type. There is an RCD, the UFH...

Hi, I have an underfloor heating mat that has been down for 8 years laid on a insulated concrete floor and under tiles in the hall. It was checked with a multi meter before and after installation. It has worked perfectly all that time but yesterday it blew the 13a fuse on the switched fused...

O.K. will try and avoid that.

Thanks for explanation. Will have a look up in the loft tomorrow with system running. Will come back with any more questions tomorrow. Cheers

I have been bleeding the system running. When it is not running there doesn't usually appear to be air in the pump.

Thanks, the system has been the same since I moved in 25 years ago but problem has only occurred this winter. Any idea what would cause it to start drawing air in now. the vent pipe is in the loft while the pump is on the first floor, the pipe is a few inches above the water level in the tank.

Hi, I have a 25 year old Potterton boiler with a Grundfos pump of same age. When the heating/hot water switches on the boiler fires up for a short while before shutting down, presumably because of the thermostat tripping on the boiler. This process continues with no hot water circulating...

Thanks everyone for the quick replies. Will do some checks on the pump as suggested. Bathjobby, the house is on an estate in the South (Dorset) and the builder went bust after selling the last one !!! Possibly skimping a bit to save cash - I have learnt a lot about plumbing while in this...

Hope someone can help. My 23 year old boiler has developed a fault. It usually (but not always) switches on O.K through the timer and starts heating up water and rads, then after about 15 minutes switches off and does not come back on. I can reignite it via the little button at the bottom...