Pool Heater heating slowly or stopping short of max temperature

Here is a summary of the video:
The video shows how to fix a master temp heater that is heating up slowly. The likely cause is a bad thermostat valve. This valve is spring loaded and is supposed to open and close to regulate the temperature, letting more water in as it gets cooler and less as it gets warmer. However, the one shown is corroded and not functioning properly.
The process for replacing it is demonstrated. The old corroded thermostat valve is removed by unscrewing it. A new one is then screwed into place using the old valve for the threads. It requires pushing firmly due to the spring tension.
Replacing the faulty thermostat valve is presented as a simple solution for when a heater is not heating up quickly. Proper opening and closing of the valve is needed to efficiently control the temperature. The demonstration provides guidance on identifying and fixing this common issue with master temp heaters.
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[@lisaforsyth4182]

Thank you for this. Fixed it.

[@Pool-guy]

Glad it helped

[@sylviacompton3461]

Any idea why my pool heater is leaking water from in side all of a sudden?

[@sylviacompton3461]

It’s leaking from white air intake at compressor

[@Pool-guy]

That’s bad. It usually indicates that the copper tubes that make up the heat exchanger have developed holes. And the water is filling up the burner compartment