Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1

3 Answers

Hayward H400 heater problem

The heater won't turn on and there is a flashing LO indicator with the service light lit!

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  • Anonymous Apr 25, 2009

    I have the exact same problem. Help!

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LO usually indicates low water pressure. Check the pressure in your filter. You may need to backwash. If the filter is to clogged then the water pressure in the heater is so low that it won't activate the pressure switch. While checking the pressure turn the pump off and then on to make sure the pressure gauge is actually working. Also check the pressure coming out of the inlets into the pool. You should be able to tell if you have sufficient water pressure.

Posted on Jan 28, 2009

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I changed the mimiset &thermostate&pilot&pressure switch
the heater working about 30days and stop after that .
-pls.what is the proplem.
thanks

Posted on Dec 19, 2012

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Depending on your model- you may have to reset it after fixing it. I backwashed mine, had the same LO error code. I pushed "mode" through all the cycles (spa, pool, etc. then back to pool) and it started right up. (I hadn't noticed it but it told me to on the heater below where it told me the various error codes...referred to it as "lock out"). Saved a service call.

Posted on May 10, 2009

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