The small rod that extends into the firing chamber is the temperature sensor, or thermocouple. Bumping the thermocouple can push it out of the firing chamber. This could cause an overfire! The controllers do not include an alarm to detect this type of failure.
Thermocouples come in different widths. The wider the thermocouple, the farther it should extend into the firing chamber. A 1/4” diameter thermocouple should extend into the firing chamber about 1”. A 1/8” thermocouple should extend 1/2” – 5/8”.
The thermocouple wires attach to the earlier DTC 600 – 1000 series controllers using screws. When turning the thermocouple screws on the back of the controller, grasp the thermocouple attachment block to prevent it from turning.
Thermocouple wires attach to the new Sentry controller with push button connectors. After attaching, pull the thermocouple wires to be sure they are tight.
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