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Hayward H300 heater runs but will not heat water

I have a Hayward H30 series heater bthat will fire up the units gets hot but will not heat the water, The heater will start but will stop for 5 minutes then restart. Can you help?

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Your internal by-pass could be stuck open or the disc could be worn to the point of letting water pass too fast. Or your thermal control valve could be stuck open. These are both found in your water header going into the heater. Hope this helps, good luck.

Posted on Dec 10, 2009

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"LO" is simply informing you that the Heater is not sensing proper water flow through it! A Flow Problem.
A special sensor, called a pressure switch is this source. But... That does not mean it is bad - No, it is in most cases just doing its job!
Most common reason - Dirty Filter.
A good cleaning of the cartridges, or maybe a breakdown and recharge of a DE Filter, or a good cleansing backwash of your sand filter, will remedy this situation.
Or... Check for any OTHER reason or situations water flow may be reduced through the heater:
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Hi,
There are two things that can cause this...
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Check and verify water flow through the heater

if that is ok, then the heat exchanger needs to be cleaned

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