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If the co reading was stable I would not worry about the heat exchanger. I agree with your second tech the furnace is dirty and needs a tune up. I have had many furnaces with co readings higher than...

Go to http://www.naturalcooling.com then you can heat and cool with out much duct at all. This would be a true cadilac system. Looking at it real seriously for our new home. Or I would do the radiant...

I would check the voltage at the output on the control board, if that checks out I would ohm the motor windings. It could be a bad cap to, that should be tested also. Sounds like you have a parts...

Let's not forget about stack temperature too. Also lowering delte t also lowers effiency and who knows what kind of co levels there are. Not a good idea at all. Open the cock up and have the furnace...

The control system used by ECR is far superior and simple to set up. I found we had to monkey with AMGEO"s quite a bit. I also get much better support from Mike at HEA. Chris Pamplin is no longer at...

I have installed both systems. I prefer ECR'S. A typical 5 ton system will hold 30 lbs of charge. They use scroll compressors and the amp draw is usually 17 to 20 amps. We bury the field six to seven...

Captain CO prefers a blank canvas. The less bad habits you have the better. Also do not sit in the front row. Do what ever it takes to attend his class. It is a real eye-opener.
Brian

It sounds like your furnace is now venting through your water heater. A tech properly trained with a combustion annalyzer can find this, it isn't rocket science. Has he checked draft? How about...