First of all you should know that this is about a 25 years furnace that is very simple and that if nothing is wrong with the heat exchanger it should last forever since, IMHO, the parts are very simple, inexpensive electronic devices (relays, controller modules and so on)
The main question is this: After an inspection do I get a paper of warranty that the inspection was done properly by a licensed installer and that the furnace is going to work for a decent number of hours after that or it will say it has this and that defficiencies?
Is such a technician insured in case his work was not properly done and the house is damaged due to that?
I want him to check what is going there and to make sure I did not create any problems and give me a paper for that
What would be a check-up list for a furnace like mine? Besides finding the cause of the overheating, these are things that I know I would like to be checked:
-heat exchanger -for cracks
-dirt in coils
-right speed of the blower motor
-gas pressure
-make sure everything is grounded properly
-make sure all the safety switches are OK (flame roll-out,pressure switch,load and fan limit etc)
Best Answer
No warranty is generally provided. A record of inspection is provided, with notes about what was checked and the readings that were recorded at the end of the adjustment procedure.
If you have been (as it would appear) in the habit of adjusting your furnace yourself, the fact that a licensed and insured service technician has looked at it in no way protects you from anything you have done to it, or may do to it again after the service person leaves.