Pool Heater Won't Start

From https://www.swimmingpoolsteve.com/pag... - If you have a problem with your pool heater in that it will not fire or turn on, this video will discuss the most common reasons why this happens and what you can do to resolve this problem.

Most commonly the pressure switch inside the heater (safety switch) is not able to close due to low pressure or low flow in the pool system. This could be from a variable speed pump that is running on too low of a speed setting, but most commonly this problem is from a restriction in your filter. If you have a sand filter be sure to backwash it thoroughly to resolve this flow problem. If you have a cartridge filter be sure that your cartridges are cleaned with a degreasing agent (not just rinsing them off). If these tips do not resolve your heater firing problem then consider having a heater cleaning service performed by a qualified gasfitter.

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