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Unit will try three times to start then shut down

\015 I have an Amana Gas Pack model PGB48C1402E. The Unit will go through three firing stages then shut down. To get the system to start I have to turn the power to the unit off and on several times before it will start to run. I have replaced the pressure switch and thermastat. Please HELP!\015

Answers :

Make sure the exhaust fan is running.You say it fires up and then cut off.Does the main burner come on just the pilot?If it's just the pilot then I would say you need to replace sense that senser the pilot lite.Because onces that senser the flame the main gas vavle should open.for give me for my mis spelling.

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Unit will try three times to start then shut down

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