[locks21]

I have an old avis forced hot air furance 25-30years old it runs on propane.
the blower keeps going on and will stay on for while then go off when it calls for heat it works fine .then later the blower will come on with no heat.
can anybody help thank you

 

[gregzoll]

When was the last time that it was services, along with the heat exchanger checked for leaks?