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My raypak heater has error code LO. What does that mean

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This is in the limit string. This is the string of safty switches in the heater. (thermostat, highlimits, rollout switch and pressure switch) The pressure switch is the most common problem. If the water flow get's to be too little so the water inside the heater is going to overheat than this will shut the heater down. This can be caused if your heater by-pass is to far open and letting water go by the heater. The most common problem is clogged baskets or a dirty filter. Other than this you can follow the flow chart in your manuel to find the source of the problem but if it just started without obvious cause this would be my bet.
I hope this helped and good luck.

Posted on Aug 31, 2010

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