I took out the pump but couldn't figure out how to get it apart without breaking it. Is there a way of squeezing it to separate the halves?
There are four legs that snap into the end of the pump. You have to stick a heavy paperclip in the hole in the end and loosed one side carefully and then the other while trying not to break the tabs. It is simple once you do it. Worst case send it to me and I can fix it.
The fyrite pro is now obsolete. The slow pump is a problem in some cases but unless you are testing oil it is okay. The O2 sensor is about $160 and you just install it yourself. I would say it is worth it to fix if everything else is in good shape. CO sensors last up to 10 years but do need to be calibrated or checked every year.
It finally got here. I was confused because the temp probe wires were heat-shrinked to the hoses so that the plug didn't reach the unit, and there was no place on the bottom of the unit to plug it in.
Then I put batteries in it and the display said it was a model 105, not 125.
Can this be used to adjust a burner?
With a 125, I would have checked the flue O2 and seen if I could get it down to 6% with a decent CO number.
With just a CO readout, I don't know what, if anything, to do with that information.
EDIT: I took it outside, zeroed it, stuck it in the vent and turned the furnace on.
It read 0 ppm CO until the burners lit, climbed to about 340, and quickly settled down to 26, eventually leveling off at 21 ppm two or three minutes later. Does this tell me anything other than my furnace isn't dangerous?