Have a brand new H250 gas heater and keep getting error code 'LO' and heater won't run consistently. Keep cleaning filter intake to make sure water is flowing thru heater. What else causes these limit sensor errors?
Low Flow errors are not necessarily real. They can be caused by improper adjustment or a defect of the pressure switch. Locate the pressure switch. Verify that the "switch" makes contact. Adjust the dial, reducing the distance the switch has to travel to engage. This will effectively lower the operating pressure required to operate. Keep adjusting until the unit stays on.
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