Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1
This can be a bad internal by-pass.(Inside the plumbing header) So all the water is going past the heater but it still has water pressure to start and will boil the water in the heater. this usually is more described as a banging rather than a poping. If it is just a poping it could be something much worse in the way of a bad heat exchanger. If you break down the top of the heater you will be able to see the wet on the exchanger pipes. If this is the problem depending on the age of your heater it may be time for a new heater.
Posted on Oct 05, 2009
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Posted on Jan 02, 2017
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