The modern-day pool heaters are designed to shut off when pool heater running but not heating, causing overheating to the pump. This is the duty of the thermal overload switches. So if your heater keeps shutting off, you may need to look at your thermal overload switches and change the faulty ones.
Additionally, why won’t my pool heater fire up?
In this way, what does Lo mean on a Hayward heater?
The Hayward heater LO code indicates a fault in the temperature limit switch, vent pressure switch, or water pressure switch. To fix it, ensure the pump is on, is wired and connected well, the water flow is above the required minimum pressure, the filters are clean. Replace defective switches.
How long do Hayward pool heaters last?
7-10 years is the average life expectancy of a pool heater. Some people get more, some get less. I would suggest you replace the unit with a Raypak. Much better unit then the Hayward’s.
The most common cause of a heater that cycles on and off could be inadequate water flow to a dirty filter or closed valve. (See information on How to Backwash a DE Filter or Clean a Cartridge Filter).
The HAYWARD heat pump pool heater is warranted to be free of defects in materials and workmanship for a period of one (1) year. The compressor is warranted for two (2) years, and the titanium tube component of the heat ex- changer has a ten (10) year warranty.
- Disconnect and then re- connect power to heater.
- Check for faulty wiring or connection. Inspect Display Interface Wiring. Ensure Display Interface Plug is securely attached to Control Module. If OK, proceed to step 2.
- Control Module and/or Display Interface Assembly are defective.