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Hayward heaters the h series gas fired pool spa heater is the result of nearly 50 years in the engineering and production of the finest in water heating equipment the direct fired finned tube design of the pool spa heater is the most advanced in the industry offering highly efficient economical pool spa heating and scale free operation. How do i repair a hayward h400 pool heater by laura paquette updated september 21 2017 check and tighten the wiring the pool heater user manual listed in the references section has a wiring diagram you can use to make sure no wires are crossed or missing if you encounter problems with your heater shortly after installation faulty . Wiring for hayward 400 hayward h series electronic gas pool heater h400 posted by anonymous on may 26 hayward h series 400 heater top for in ground pools and spas dhi400 open questions 0 answers need wiring diagram for a marathon electric motor hayward 2hp pool pump motor a o. Hayward ed1 h series heaters parts diagram notice important when adding items to the shopping cart from this page please make sure that the item added is the same as listed on this page occasionally part numbers will change and will not be reflected on this page