Kurt at koegel plumbing is amazing!! should have called him sooner thank you!!! On some occasions (i.e a soldered joint is leaking), a quick fix is all that is needed. Plumbing or a blocked drainage emergency - make us your first port of call! A yellow flame is the main indicator that carbon monoxide is created by your system other possible signs include the following. Is a plumber required to be insured and bonded? Awesome service quick to respond! thanks! Nest helps to make peopleâ€™s homes warmer.