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poolguy810
poolguy810, owner - pool and spa service company
Category: Pool and Spa
Satisfied Customers: 1675
Experience:  Servicing pools and all brands of spas for over 28 years.
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Hayward 400ED pool heater. About 10 years old. Control board

Customer Question

Hayward 400ED pool heater. About 10 years old. Control board replaced 3 years ago. Was working fine until this year. Have replaced thermostats and pressure switch pool will only shoot out lukewarm water and then shutdown after about 10 minutes. Issue?
Submitted: 4 months ago.
Category: Pool and Spa
Expert:  PitschPlumbing replied 4 months ago.
Is the heater making any noises? Water flow good?
Customer: replied 4 months ago.
No noises. Flow is perfect
Expert:  PitschPlumbing replied 4 months ago.
There's 2 items to look at on the heater. First is the flow control thermostat. Which looks just like an automotive t-stat. Second is the bypass, which regulates the flow of water through the heat exchanger. If the unit is stuck ooen, or the material around the bypass has disintegrated, it will allow to much water to not go throughout exchanger and the heater can slowly over heat. If it was stuck wide open, it would be crackling. How confident are you in regards ***** ***** on this in unit?
Customer: replied 4 months ago.
I'm fairly comfortable working on it. Please advise on steps.