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either your thermostat is bad or the flame sensor on unit is no good. it also can be a limit switch. if it lights and stays on for awhile but doesnt reach temperature then its thermostat. if it lights for 10 seconds it is sensor or limit switch.

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Q: What is wrong when the Rudd heating unit ignites but does not stay on long enough for the temperature to come up to the thermostat setting?
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