| 摘要 |
A furnace for combustible fuels that incorporates a main igniter and an auxiliary back-up igniter for igniting the fuel. When power is applied to the main igniter, a sensor detects whether or not current flows through the main igniter. If there is current flow through the main igniter, the back-up igniter is isolated from the input power. If there is an absence of current flow through the main igniter, the power is switched to the auxiliary back-up igniter. A warning device is provided to alert a user when the power has been switched to the back-up igniter indicating that the main igniter is inoperable.
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