I was asked how to clean the heat exchanger if it did not have cleanouts. This one covers that. I still don't recommend cleaning the heat exchanger with just a shop vac (the vac truck has a more powerful vac), but if thats what you have to do. This video is part of the heating and cooling series of training videos made to accompany my websites: www.graycoolingman.com and www.grayfurnaceman.com to pass on what I have learned in many years of service and repair. If you have suggestions or comments they are welcome.
If you are a homeowner looking to repair your own appliance, understand that the voltages can be lethal, the fuels are highly flammable and high pressures are used. Know your limits.