Hi
I have the above warm air system in a 2 bedroom house. I came home last week and the house had a very musty burnt smell. I found that the fan would not turn and was very hot so i brought a new fan thinking the fan motor had burnt out, as the motor really smelled of burning.
The same problem is still happening, after 20-40 minutes with the heating on the fan just stops and will not start again and the fan assembly feels really hot and does not seem to cool down and feels like it is getting hotter. There is no problem with the pilot light as this is still alight.
I was thinking, if there was a blockage and have been to the loft and felt the flume/pipework, the pipework is slightly warm but the bit that goes through the roof is very hot. I took the pipe off and cannot feel any wind/breeze from the bit going through the roof, is this normal.
I have now turned the gas off to the unit and I will be getting an engineer out but any advise would be appreicated and if anyone knows of a J&S specialist gas engineer.
Sorry to write a long winded chapter.

Eldon, November 2008

i have a whole system for sale secondhand please contact me at teggi01@hotmail.com

teggi, February 2009

The thing I was looking at turns out to be the air flow sensor. Is it the same thing as thermal resistor? It has blue cables and locates on the top left corner of the bottom compartment.

Goa, December 2008

I got the same problem and the cable to the thermal resistor seemed ok. Probably I need to get a new thermal resistor. It looks easy to replace but the question is where I can buy one.

Goa, December 2008

Thank you ExiZ. I will check this out this evening.

Eldon, December 2008

There is a thermal resistor in the top of the heat exchanger which when it gets hot it tells the fan to come on. This is in the top left of the bottom compartment, blue wires. Perhaps this has broken and is no longer telling the fan to come on properly, therfore there is a build up of heat as the fan doesnt start blowing it around ?

ExiZ, December 2008