When trying to run hot water the flu light comes on and the water stays cold. If i move one of the joint 3 plastic pipes from the airflow switch and put my finger over one of the pipes it fires up. But as soon as I connect back to the airflow switich then flame goes out and water goes cold.
Could it be a faulty air switch or could it be a faulty flu has this only happens when it rains heavely.
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