Question about Bosch & Tankless LP Hot Water Heater

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Sometimes it doesn't light at all other times during use the hot water goes off and the box keeps flashing green as it continues to spark

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It sounds like the flame sensor is dirty or faulty. when the pilot lights the flame sensor rod recognises the flame to allow the main gas valve to open and ignite the burners. you can clean the flame sensor with some steel wool or sandcloth

Posted on Dec 29, 2010

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