If the light is yellow, it’s not only a warning sign that your furnace needs repairs, but that your furnace could be leaking carbon monoxide, a poisonous gas. If you notice a yellow pilot light, excessive condensation, rust, or a rotten egg smell, shut off your furnace immediately and call an HVAC technician.
A yellow or flickering flame may be a sign that the furnace is creating poisonous carbon. Other possible signs of carbon monoxide:

Streaks of soot around the furnace;

Absence of an upward draft in your chimney;
Excess moisture found on windows, walls, or other cold surfaces;
Excessive rusting on flue pipes, other pipe connections, or appliance jacks;
Small amount of water leaking from the base of the chimney, vent, or flue pipe;
Rust can be seen on the vent pipe from the outside

Are your utility bills rising?

Furnaces often lose efficiency as they age, especially if they have not been properly maintained. Your utility bills rise because your furnace may run longer to provide the same amount of heat.
Does your furnace make strange noises?
Aging furnaces often make some strange noises toward the end of their life — banging, popping, rattling, or squealing. Or you may you hear the furnace blower running excessively, turning off and on frequently, or blowing cold air sometimes. These may mean your furnace needs to be replaced.

Does your furnace make strange noises?

Aging furnaces often make some strange noises toward the end of their life — banging,
popping, rattling, or squealing. Or you may you hear the furnace blower running
excessively, turning off and on frequently, or blowing cold air sometimes. These may
mean your furnace needs to be replaced.

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