For the home owner operating a Monitor heater the peep window is the most important item for determining the health of your heater. If you can not see the flame through the window it is imperative to have the window cleaned. Without being able to see the flame, you can not determine its condition. The flame should be blue with no yellow to speak of. When the heater first comes on and during any change in settings the flame will be momentarily yellow but should change to blue very fast. A yellow flame is telling you that service is not long away. A tall yellow flame will need to be addressed right away. Cleaning the window is easy. You will need to have a gasket ready to go back on when you take the window frame off. You should be able to clean the window with 409 or Windex. Once you can see the flame you will be much more aware of the condition of your heater and in a position to make a decision on maintenance. Remember, service your heater early in the year, and early is not Jan or Feb.
Tom
Tom
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